3,13Java基础知识：GUI全部

GUI 图形用户界面

JavaGUI的容器
首层容器：JWindow JFrame(默认BorderLayout) JDialog
中间容器：JPanel（默认FLowlayout）

内容面板：Container

AWT：使用操作系统本身，跨平台时效果不一样
Swing：效果一样，跨平台

Swing 程序建立步骤：
①建立容器
②建立组件
③组件添加到容器
④设置布局
⑤添加事件

Swing 容器
JApplet 浏览器中运行的容器
JFrame 顶层容器，不能包含在其他容器中
JPanel 举行区域，页面
JScrollPane
JDialog

布局管理器：
主要有FLowlayout 从左到右从上到下
BorderLayout EWSN Center
GridLayout（行，列，行宽，列宽）；
CardLayout

卡片布局实现过程
JPanel使用卡片布局，添加对应用卡片页面，设置时间实现卡片切换

事件：
步骤：
①建立事件源
②为事件源对象选择合适事件监听器
③为监听器添加合适处理程序
④为监听器与事件源建立联系，绑定，将监听器对象注册到事件源上

定义监听器可选方法：
①GUI程序本身实现监听（不好，违背单一原则，addActionListener（this））
②内部类定义监听器类 new出来，在add
③使用匿名内部类

第二三种成为事件驱动的标准

各种组件使用，注意，得到内容，事件驱动程序如下：

package com.Frame;

import java.awt.Container;
import java.awt.Font;
import java.awt.GraphicsConfiguration;
import java.awt.HeadlessException;
import java.awt.Toolkit;

import javax.swing.JButton;
import javax.swing.JCheckBox;
import javax.swing.JComboBox;
import javax.swing.JFrame;
import javax.swing.JLabel;
import javax.swing.JPasswordField;
import javax.swing.JRadioButton;
import javax.swing.JTextArea;
import javax.swing.JTextField;

/**
 * @Author: YuanqiuChen
 * @Date:2016-3-11-下午1:09:32
 *
 *
 */

public class MyFrame extends JFrame{

    private int width = 1024;
    private int height = 1024 * 618 / 1000;
    private Container contentP;
    private JLabel label;
    private JTextField text;
    private JPasswordField passwordField;
    private JButton button;
    private JRadioButton redioBtn;
    private JCheckBox checkBox;
    private JComboBox comboBox;
    private JTextArea textBox;
    
    
    
    public MyFrame() throws HeadlessException {
        super();
        this.setTitle("haha");

        this.setSize(width, height);
        //设置居中
        this.setLocationRelativeTo(null);
        
        
        //左上角为原点，距离它为XY
        Toolkit tool = Toolkit.getDefaultToolkit();
        int x = (int)tool.getScreenSize().getWidth();
        int y = (int)tool.getScreenSize().getHeight();
        this.setLocation((x-this.width)/2, (y-this.height)/2);
        
        //设置标题图片
        this.setIconImage(tool.createImage("C:/Users/Administrator/Desktop/11.jpg"));
//        this.setIconImage(tool.createImage("img/e.png"));
        
        this.addContent();
        this.setVisible(true);
        this.setDefaultCloseOperation(JFrame.EXIT_ON_CLOSE);
    }

    public void addContent(){        

        //容器,获得当前容器的内容面板，组件都要加载内容面板里
        this.contentP= this.getContentPane();
        //布局
        this.contentP.setLayout(null);//自然布局，即绝对布局，所以要加坐标
        
        //添加组件
        //常用组件：JLabel-文本        JTextField-文本框        JPasswordField-密码框
        //JRadioButtom-单选按钮    JCheckBox-复选框        JComboBox-下拉列表
        //JTextArea-文本域        JButton-按钮
        
        //JLabel三个常用方法：显示文本，显示图片，显示边框（可以缩小到线条）
        //显示背景的时候，可以设置不透明setOpaque为true
        //☆如果几个都显示在同一位置，（级别相同）显示层次先添加的在顶层，可见，后添加的在底层，背景
        //如果级别不同，有添加顺序才会显示，轻量级的放在重量级的上面，显示的是轻量级的
        
        
        this.label = new JLabel("用户名");
        this.label.setBounds(100, 100, 100, 135);
        this.label.setFont(new Font("宋体", Font.PLAIN, 24));
        
        this.contentP.add(this.label);//添加文本组件
        
        
        this.checkBox = new JCheckBox("运动");
        this.checkBox.setBounds(350, 120,180, 135);
        this.contentP.add(checkBox);
        
        this.contentP.add(checkBox);
    }
    
    
    
}

package com.Frame;

import java.awt.Color;
import java.awt.Container;
import java.awt.Font;
import java.awt.Toolkit;

import javax.swing.BorderFactory;
import javax.swing.ButtonGroup;
import javax.swing.JButton;
import javax.swing.JCheckBox;
import javax.swing.JComboBox;
import javax.swing.JFrame;
import javax.swing.JLabel;
import javax.swing.JPasswordField;
import javax.swing.JRadioButton;
import javax.swing.JTextArea;
import javax.swing.JTextField;

/**
 * Date: 2016-3-11-下午1:06:22 Class_name: SimpleFrame.java Package_name:
 * com.lovo.demo_16 Author: ZhangYue Description:
 */
public class SimpleFrame extends JFrame {

    private int width;
    private int height;
    private Container contentP;
    private JLabel usernameLabel;
    private JLabel passwordLabel;
    private JTextField usernameField;
    private JPasswordField passwordField;
    private JRadioButton maleBtn;
    private JRadioButton femaleBtn;
    private JCheckBox hobbyCheckBox1;
    private JCheckBox hobbyCheckBox2;
    private JCheckBox hobbyCheckBox3;
    private JComboBox addressCombBox;
    private JTextArea describeTextArea;
    private JButton submitBtn;
    private JButton cancelBtn;

    public SimpleFrame() {
        this.width = 1024;
        this.height = 600;
        this.setTitle("我的第一个GUI窗体");
        this.setSize(this.width, this.height);
        Toolkit tool = Toolkit.getDefaultToolkit();
        double width = tool.getScreenSize().getWidth();
        double height = tool.getScreenSize().getHeight();
        this.setLocation((int) (width - this.width) / 2,
                (int) (height - this.height) / 2);

        this.setIconImage(tool.createImage("img/logo.png"));

        // this.setLocationRelativeTo(null);//设置窗体居中
        this.setDefaultCloseOperation(JFrame.EXIT_ON_CLOSE);
        
        this.addContent();

        this.setVisible(true);
    }

    public void addContent() {
        this.contentP = this.getContentPane();
        this.contentP.setLayout(null);
        
        //文本 和 输入框
        this.usernameLabel = new JLabel("用户名");
        this.usernameLabel.setBounds(350, 10, 90,35);
        this.usernameLabel.setFont(new Font("宋体", Font.PLAIN, 16));
        this.contentP.add(this.usernameLabel);//添加文本组件
        
        this.usernameField = new JTextField();
        this.usernameField.setBounds(450, 10, 200,35);
        this.contentP.add(this.usernameField);
        
        this.passwordLabel = new JLabel("密    码");
        this.passwordLabel.setBounds(350, 60, 90,35);
        this.passwordLabel.setFont(new Font("宋体", Font.PLAIN, 16));
        this.contentP.add(this.passwordLabel);//添加文本组件
        
        //密码框
        this.passwordField = new JPasswordField();
        this.passwordField.setBounds(450, 60, 200,35);
        this.passwordField.setEchoChar('*');
//        this.passwordField.setForeground(Color.RED);
        this.contentP.add(this.passwordField);
        
        
        //单选框
        JLabel genderTitle = new JLabel("性别");
        genderTitle.setBounds(350, 110, 80, 30);
        genderTitle.setFont(new Font("宋体", Font.PLAIN, 16));
        this.contentP.add(genderTitle);
        
        this.maleBtn = new JRadioButton("男");
        this.maleBtn.setBounds(440, 110, 50,35);
        this.contentP.add(this.maleBtn);
        this.femaleBtn = new JRadioButton("女");
        this.femaleBtn.setBounds(500, 110, 50,35);
        this.contentP.add(this.femaleBtn);
        ButtonGroup bp = new ButtonGroup();
        bp.add(this.maleBtn);
        bp.add(this.femaleBtn);
        
        //复选框
        this.hobbyCheckBox1 = new JCheckBox("运动");
        this.hobbyCheckBox2 = new JCheckBox("电影");
        this.hobbyCheckBox3 = new JCheckBox("音乐");
        this.hobbyCheckBox1.setBounds(350, 160, 80,35);
        this.hobbyCheckBox2.setBounds(440, 160, 80,35);
        this.hobbyCheckBox3.setBounds(540, 160, 80,35);
        
        this.contentP.add(this.hobbyCheckBox1);
        this.contentP.add(this.hobbyCheckBox2);
        this.contentP.add(this.hobbyCheckBox3);
        
        //下拉框
        this.addressCombBox = new JComboBox(new String[]{"成都", "德阳", "绵阳", "乐山", "资阳"});
        this.addressCombBox.addItem("达州");
        this.addressCombBox.addItem("自贡");
        this.addressCombBox.setSelectedIndex(5);
        this.addressCombBox.setBounds(350, 210, 120, 25);
        this.contentP.add(this.addressCombBox);
        
        //文本域
        this.describeTextArea = new JTextArea();
        this.describeTextArea.setBounds(350, 250, 300, 100);
//        this.describeTextArea.setColumns(5);
//        this.describeTextArea.setRows(3);
        this.describeTextArea.setBorder(BorderFactory.createLineBorder(Color.BLACK));
        this.contentP.add(this.describeTextArea);
        
        //按钮
        this.submitBtn = new JButton("确定");
        this.submitBtn.setBounds(400, 400, 80, 30);
        this.contentP.add(this.submitBtn);
        
        this.cancelBtn = new JButton("取消");
        this.cancelBtn.setBounds(500, 400, 80, 30);
        this.contentP.add(this.cancelBtn);
        
    }
    
    public static void main(String[] args) {
        new SimpleFrame();
    }

    public int getWidth() {
        return width;
    }

    public void setWidth(int width) {
        this.width = width;
    }

    public int getHeight() {
        return height;
    }

    public void setHeight(int height) {
        this.height = height;
    }

    public Container getContentP() {
        return contentP;
    }

    public void setContentP(Container contentP) {
        this.contentP = contentP;
    }

    public JLabel getUsernameLabel() {
        return usernameLabel;
    }

    public void setUsernameLabel(JLabel usernameLabel) {
        this.usernameLabel = usernameLabel;
    }

    public JLabel getPasswordLabel() {
        return passwordLabel;
    }

    public void setPasswordLabel(JLabel passwordLabel) {
        this.passwordLabel = passwordLabel;
    }

    public JTextField getUsernameField() {
        return usernameField;
    }

    public void setUsernameField(JTextField usernameField) {
        this.usernameField = usernameField;
    }

    public JPasswordField getPasswordField() {
        return passwordField;
    }

    public void setPasswordField(JPasswordField passwordField) {
        this.passwordField = passwordField;
    }

    public JRadioButton getMaleBtn() {
        return maleBtn;
    }

    public void setMaleBtn(JRadioButton maleBtn) {
        this.maleBtn = maleBtn;
    }

    public JRadioButton getFemaleBtn() {
        return femaleBtn;
    }

    public void setFemaleBtn(JRadioButton femaleBtn) {
        this.femaleBtn = femaleBtn;
    }

    public JCheckBox getHobbyCheckBox1() {
        return hobbyCheckBox1;
    }

    public void setHobbyCheckBox1(JCheckBox hobbyCheckBox1) {
        this.hobbyCheckBox1 = hobbyCheckBox1;
    }

    public JCheckBox getHobbyCheckBox2() {
        return hobbyCheckBox2;
    }

    public void setHobbyCheckBox2(JCheckBox hobbyCheckBox2) {
        this.hobbyCheckBox2 = hobbyCheckBox2;
    }

    public JCheckBox getHobbyCheckBox3() {
        return hobbyCheckBox3;
    }

    public void setHobbyCheckBox3(JCheckBox hobbyCheckBox3) {
        this.hobbyCheckBox3 = hobbyCheckBox3;
    }

    public JComboBox getAddressCombBox() {
        return addressCombBox;
    }

    public void setAddressCombBox(JComboBox addressCombBox) {
        this.addressCombBox = addressCombBox;
    }

    public JTextArea getDescribeTextArea() {
        return describeTextArea;
    }

    public void setDescribeTextArea(JTextArea describeTextArea) {
        this.describeTextArea = describeTextArea;
    }

    public JButton getSubmitBtn() {
        return submitBtn;
    }

    public void setSubmitBtn(JButton submitBtn) {
        this.submitBtn = submitBtn;
    }

    public JButton getCancelBtn() {
        return cancelBtn;
    }

    public void setCancelBtn(JButton cancelBtn) {
        this.cancelBtn = cancelBtn;
    }
    
    

}

package com.Frame;

import java.awt.Color;
import java.awt.Font;
import java.awt.Toolkit;
import java.awt.event.ActionEvent;
import java.awt.event.ActionListener;
import java.awt.event.KeyEvent;
import java.awt.event.KeyListener;

import javax.swing.BorderFactory;
import javax.swing.JButton;
import javax.swing.JFrame;
import javax.swing.JLabel;
import javax.swing.JOptionPane;
import javax.swing.JTextField;



/**
 * @Author: YuanqiuChen
 * @Date:2016-3-16-下午10:07:13
 *
 *
 */

public class GuessNumUI extends JFrame{
    private JLabel la1,la2,laResult;
    private JButton yes, no, btnAgain;
    private JTextField inputNum;
    
    private int randomNum = (int)(Math.random()*50) + 50;
    private int n = 0;
    
    public GuessNumUI(){
        this.setSize(600,500);
        this.setTitle("猜数字游戏");
        this.setLocationRelativeTo(null);//设置窗体居中
        
        addContent();
        addEventHandler();
        
        this.setVisible(true);
        this.setDefaultCloseOperation(JFrame.EXIT_ON_CLOSE);
    }

    private void addContent(){
        this.setLayout(null);
        
        this.la1 = new JLabel();
        this.la1.setBounds(0, 0, 580,180);
        this.la1.setBorder(BorderFactory.createTitledBorder("YourGuess"));
        this.add(la1);
        
        this.la2 = new JLabel();
        this.la2.setBounds(0, 180, 580,180);
        this.la2.setBorder(BorderFactory.createTitledBorder("Hint"));
        this.add(la2);
        
        this.yes = new JButton("确定");
        this.yes.setBounds(200, 390, 60, 30);
        this.add(yes);
        
        this.no = new JButton("取消");
        this.no.setBounds(300, 390, 60, 30);
        this.add(no);
        
        this.btnAgain = new JButton("再来一次");
        this.btnAgain.setBounds(400, 390, 100, 30);
        this.add(btnAgain);
        
        this.inputNum = new JTextField();
        this.inputNum.setFont(new Font("宋体", Font.BOLD, 20));
        this.inputNum.setBounds(160, 30, 300, 50);
        this.add(inputNum);
        
        this.laResult = new JLabel("Let's Play!");
        this.laResult.setFont(new Font("宋体", Font.BOLD, 20));
        this.laResult.setBounds(200, 230, 300, 50);
        this.add(laResult);
    }
    
    //添加事件
    public void addEventHandler(){
        //添加监听器
        this.yes.addActionListener(
                new ActionListener() {
                    public void actionPerformed(ActionEvent e) {
                        guess();
                        inputNum.setText("");
                    }
                }
        );
        
        this.no.addActionListener(
                new ActionListener() {
                    public void actionPerformed(ActionEvent e) {
                        System.out.println(randomNum);
                        System.exit(0);
                    }
                }
        );
        
        this.btnAgain.addActionListener(
                new ActionListener() {
                    public void actionPerformed(ActionEvent e) {
                        yes.setEnabled(true);
                        randomNum = (int)(Math.random()*50) + 50;
                        n = 0;
                        inputNum.setText("");
                        laResult.setText("再来一次！Come On!");
                    }
                }
        );
        
        //把按回车键监听器注册到事件源上
        EnterKeyEvent enterKeyEvent = new EnterKeyEvent();
        this.addKeyListener(enterKeyEvent);
        this.inputNum.addKeyListener(enterKeyEvent);
        this.yes.addKeyListener(enterKeyEvent);
                
    }

    private class EnterKeyEvent implements KeyListener{
        public void keyTyped(KeyEvent e) {}
        public void keyPressed(KeyEvent e) {
            if(e.getKeyCode() == KeyEvent.VK_ENTER){
                if(yes.isEnabled()){
                    guess();
                }
                inputNum.setText("");
            }
        }
        public void keyReleased(KeyEvent e) {}
        
    }
    
    public void guess(){
        System.out.println(randomNum);
        String inputStr = this.inputNum.getText().trim();
        int num;
        if(!inputStr.matches("[0-9]+")){
            this.laResult.setText("请输入正整数");
            return;
        }else{
            num = Integer.parseInt(inputStr);
        }
        
        if(num < 50 || num > 99){
            this.laResult.setText("请输入50-99的数");
            return;
        }
        
        if(num == randomNum){
            this.laResult.setText("猜对了,随机数是：" + randomNum);
            n++;
            this.yes.setEnabled(false);
            
//            long now = System.currentTimeMillis();
//            while((System.currentTimeMillis() - now) < 3000){
//                
//            }
            
            try {
                Thread.sleep(3000);
            } catch (InterruptedException e) {
                // TODO Auto-generated catch block
                e.printStackTrace();
            }
            
//            int choice = JOptionPane.showConfirmDialog(null, "确认退出");
//            if(choice == 0){}    
//            System.exit(0);
            
            return;
        }else{
            n++;
            if(num < randomNum){
                this.laResult.setText("猜小了");
            }else{
                this.laResult.setText("猜大了");
            }
        }
        
        if(n >= 7){
            this.laResult.setText(n + "次机会已用完,随机数是：" + randomNum);
            this.yes.setEnabled(false);
        }
    }
    
    public static void main(String[] args) {
        new GuessNumUI();
    }

}

package com.Frame;

import java.awt.BorderLayout;
import java.awt.Color;
import java.awt.Font;
import java.awt.Graphics;
import java.awt.GridLayout;
import java.awt.event.ActionEvent;
import java.awt.event.ActionListener;
import java.util.Random;

import javax.swing.BorderFactory;
import javax.swing.JButton;
import javax.swing.JFrame;
import javax.swing.JLabel;
import javax.swing.JPanel;
import javax.swing.JTextField;
import javax.swing.border.Border;

import com.Frame.test.Delay;

/**
 * @Author: YuanqiuChen
 * @Date:2016-3-17-上午9:22:57
 *
 *加入三个面板，直接设置边框
 * 比自己写的好处，加入三个面板，面板设置边框
 * 
 * 换颜色
 */

public class ChangeColor extends JFrame{
    
    private static final long serialVersionUID = 1L;


    private JPanel mianBan1, mianBan2, mianBan3;

    private JButton changeColor, ziDongChangeColor;
    private JLabel laResult;
    
    private boolean flag = false;
    
    ChangeColorThread t = new ChangeColorThread();

    public JButton getZiDongChangeColor() {
        return ziDongChangeColor;
    }

    public void setZiDongChangeColor(JButton ziDongChangeColor) {
        this.ziDongChangeColor = ziDongChangeColor;
    }

    public boolean getFlag() {
        return flag;
    }

    public void setFlag(boolean flag) {
        this.flag = flag;
    }

    
    public ChangeColor(){
        this.setSize(600,500);
        this.setTitle("换颜色");
        this.setLocationRelativeTo(null);//设置窗体居中
        
        addContent();
        addEventHandler();
                
        
        
        this.setVisible(true);
        this.setDefaultCloseOperation(JFrame.EXIT_ON_CLOSE);
    }
    
    private void addContent() {
        this.mianBan1 = new JPanel();
        this.mianBan1.setLayout(null);
        this.mianBan1.setBorder(BorderFactory.createTitledBorder("YourGuess"));
    
        this.mianBan1.setBackground(new Color(200,220,240));
        
        
        
        this.mianBan2 = new JPanel();
        this.mianBan2.setBorder(BorderFactory.createTitledBorder("Hint"));
        this.laResult = new JLabel("Let's Play!");
        this.laResult.setFont(new Font("宋体", Font.BOLD, 20));
        this.mianBan2.add(laResult);
        
        
        
        this.mianBan3 = new JPanel();
        this.mianBan3.setBorder(BorderFactory.createTitledBorder(""));
        
        
        this.changeColor = new JButton("换颜色");
        this.mianBan3.add(changeColor);
        
        this.ziDongChangeColor = new JButton("自动换颜色");
        this.mianBan3.add(ziDongChangeColor);
        
        this.setLayout(new GridLayout(3,1));
        this.add(mianBan1);this.add(mianBan2);this.add(mianBan3);
    }
    
    private void addEventHandler() {
        this.changeColor.addActionListener(new ActionListener() {
            @Override
            public void actionPerformed(ActionEvent e) {
                mianBan1.setBackground(new Color((int)(Math.random()*256),(int)(Math.random()*256),(int)(Math.random()*256)));
                mianBan2.setBackground(new Color((int)(Math.random()*256),(int)(Math.random()*256),(int)(Math.random()*256)));
                mianBan3.setBackground(new Color((int)(Math.random()*256),(int)(Math.random()*256),(int)(Math.random()*256)));
                
            }
        });
        
        
        this.ziDongChangeColor.addActionListener(new ActionListener() {
            private Delay d = new Delay();
            public void actionPerformed(ActionEvent e) {
                
                if(flag){
                    flag = false;
//                    t.stop();
                }else{
                    flag = true;
//                    t.start();
                    new ChangeColorThread().start();
                
                }
                System.out.println(flag);
            }
        });
        
        
    }

    public void delay(int i){
//        long now = System.currentTimeMillis();
//        while(System.currentTimeMillis() - now < i){
//        }
//        for(int j = 0; j < i*10; j++ ){
//            System.out.println(11111);
//        }
    }
    
    public void changeColor(){
        mianBan1.setBackground(new Color((int)(Math.random()*256),(int)(Math.random()*256),(int)(Math.random()*256)));
        mianBan2.setBackground(new Color((int)(Math.random()*256),(int)(Math.random()*256),(int)(Math.random()*256)));
        mianBan3.setBackground(new Color((int)(Math.random()*256),(int)(Math.random()*256),(int)(Math.random()*256)));
    }
    
    public static void main(String[] args) {
        new ChangeColor();
    }

    public void paint(Graphics g) {
        Random r = new Random();
        mianBan1.setBackground(new Color((int)(Math.random()*256),(int)(Math.random()*256),(int)(Math.random()*256)));
        mianBan2.setBackground(new Color((int)(Math.random()*256),(int)(Math.random()*256),(int)(Math.random()*256)));
        mianBan3.setBackground(new Color((int)(Math.random()*256),(int)(Math.random()*256),(int)(Math.random()*256)));

    }
    
    //在Java的界面里边，不能出现太多的for循环，线程等待等，否则就会跟新显示不对，直接卡死，或者只显示最后一个图像
    //必须放在线程里边才对
    class ChangeColorThread extends Thread {
        //问题，开始时为true，最后再false，可以运行一段时间结束
        //开始为false，切换为真，不可以运行，因为顺序运行
        public void run() {
            while (flag) {
                    System.out.println("thread"+flag);
                    repaint();
                    try {
                        Thread.sleep(1000);
                    } catch (InterruptedException e) {
                        e.printStackTrace();
                    }
            }
        }
    }
}

package com.Frame;

import java.awt.BorderLayout;
import java.awt.GridLayout;
import java.awt.event.ActionEvent;
import java.awt.event.ActionListener;
import java.awt.event.KeyEvent;
import java.awt.event.KeyListener;

import javax.print.attribute.standard.OutputDeviceAssigned;
import javax.swing.JButton;
import javax.swing.JFrame;
import javax.swing.JLabel;
import javax.swing.JOptionPane;
import javax.swing.JPanel;
import javax.swing.JPasswordField;
import javax.swing.JTextField;

/**
 * @Author: YuanqiuChen
 * @Date:2016-3-15-下午10:02:56
 *
 *
 */

public class Login extends JFrame{

    private JLabel laAccount, lapassword;
    private JTextField textAccount;
    private JPasswordField  textPassword;
    private JButton btnLogin;
    private JPanel mianBan1, mianBan2, mianBan3;
    
    public Login(){
        init();
        this.pack();
//        this.setSize(500,500);
        
        this.setTitle("登录");
        this.setLocationRelativeTo(null);
        this.setResizable(false);
        this.setVisible(true);
        this.setDefaultCloseOperation(JFrame.EXIT_ON_CLOSE);
    
    }
    
    private void init(){
        this.laAccount = new JLabel("账号：");
        this.lapassword = new JLabel("密码：");
        this.textAccount = new JTextField("测试账号：123，密码123",20);
        this.textPassword = new JPasswordField(20);
        this.btnLogin = new JButton("登录");
        
        this.setLayout(new GridLayout(3,1));
        this.mianBan1 = new JPanel();mianBan2 = new JPanel();mianBan3 = new JPanel();
        
        this.mianBan1.add(laAccount);this.mianBan1.add(textAccount);
        this.mianBan2.add(lapassword);this.mianBan2.add(textPassword);
        this.mianBan3.add(btnLogin);
        
        
        //面板可以添加到面板里边
//        mianBan1.add(mianBan2);
        
        this.add(mianBan1);this.add(mianBan2);this.add(mianBan3);
        
        
        //添加事件
        addEventHandler();
    }
    
    //验证登录
    private void check(){
        if(textAccount.getText().trim().equals("123") && textPassword.getText().trim().equals("123")){
            mianBan1.setVisible(false);
            mianBan2.setVisible(false);
            mianBan3.setVisible(false);
            
            
            JOptionPane.showMessageDialog(mianBan1, "登录成功", "登录提示", JOptionPane.INFORMATION_MESSAGE); 
//            System.out.println("haha");
        }else{
            JOptionPane.showMessageDialog(null, "登录失败", "登录提示", JOptionPane.WARNING_MESSAGE);
//            System.out.println("cuo");
        }

    } 
    
    //添加事件处理
    private void addEventHandler(){
        this.textPassword.addKeyListener(new KeyListener() {
            public void keyTyped(KeyEvent e) {}
            public void keyReleased(KeyEvent e) {}
            
            public void keyPressed(KeyEvent e) {
                if(e.getKeyCode() == KeyEvent.VK_ENTER){
                    check();
                }
            }
        });
        //添加监听器
        this.btnLogin.addActionListener(
            new ActionListener() {
                public void actionPerformed(ActionEvent e) {
//                                this.textAccount.getText();//这里不能加this表示当前对象，不对
                    check();
                }
            }
        );
    }
    
    public static void main(String[] args) {
        new Login();
    }

}

布局：

package com.gui_layout;

import java.awt.BorderLayout;
import java.awt.Container;
import java.awt.FlowLayout;

import javax.swing.JButton;
import javax.swing.JFrame;
import javax.swing.JLabel;

/**
 * Date: 2016-3-16-上午9:38:46
 * Class_name: BorderLayoutTest.java
 * Package_name: com.lovo.demo_16
 * Author: ZhangYue
 * Description: 
 */
public class BorderLayoutTest extends JFrame{

    public BorderLayoutTest(){
        this.setSize(900,600);
        this.setDefaultCloseOperation(JFrame.EXIT_ON_CLOSE);
        this.setTitle("边界布局");
        this.setLocationRelativeTo(null);//设置窗体居中
        
        this.addContent();
        
        this.setVisible(true);
    }
    
    
    public void addContent(){
        Container con = this.getContentPane();
        con.setLayout(new BorderLayout());
        
        JButton btn1 = new JButton("确定1");
        JButton btn2 = new JButton("确定2");
        JButton btn3 = new JButton("确定3");
        JButton btn4 = new JButton("确定4");
        JButton btn5 = new JButton("确定5");
        
        con.add(btn1, BorderLayout.EAST);
        con.add(btn2, BorderLayout.WEST);
        con.add(btn3, BorderLayout.NORTH);
        con.add(btn4, BorderLayout.SOUTH);
        con.add(btn5, BorderLayout.CENTER);
    }
    
    
    public static void main(String[] args) {
        new BorderLayoutTest();
    }
}

package com.gui_layout;

import java.awt.Container;
import java.awt.FlowLayout;

import javax.swing.JButton;
import javax.swing.JFrame;
import javax.swing.JLabel;

/**
 * Date: 2016-3-16-上午9:15:36
 * Class_name: FlowLayoutTest.java
 * Package_name: com.lovo.demo_16
 * Author: ZhangYue
 * Description: 
 */
public class FlowLayoutTest extends JFrame{

    public FlowLayoutTest(){
        this.setSize(900,600);
        this.setDefaultCloseOperation(JFrame.EXIT_ON_CLOSE);
        this.setTitle("流布局");
        this.setLocationRelativeTo(null);//设置窗体居中
        
        this.addContent();
        
        this.setVisible(true);
    }
    
    
    public void addContent(){
        Container con = this.getContentPane();
        
        con.setLayout(new FlowLayout());
        
        JLabel label = new JLabel("Test");
        JButton btn = new JButton("根据元素内容确定大小");
        JButton btn2 = new JButton("确定");
        JButton btn3 = new JButton("确定");
        JButton btn4 = new JButton("确定");
        JButton btn5 = new JButton("确定5");
        
        con.add(label);
        con.add(btn);
        con.add(btn2);
        con.add(btn3);
        con.add(btn4);
        con.add(btn5);
    }
    
    
    public static void main(String[] args) {
        new FlowLayoutTest();
    }

}

package com.gui_layout;

import java.awt.BorderLayout;
import java.awt.Container;
import java.awt.GridLayout;

import javax.swing.JButton;
import javax.swing.JFrame;

/**
 * Date: 2016-3-16-上午10:25:29
 * Class_name: GridLayoutTest.java
 * Package_name: com.lovo.demo_16
 * Author: ZhangYue
 * Description: 
 */
public class GridLayoutTest extends JFrame {

    public GridLayoutTest(){
        this.setSize(900,600);
        this.setDefaultCloseOperation(JFrame.EXIT_ON_CLOSE);
        this.setTitle("网格布局");
        this.setLocationRelativeTo(null);//设置窗体居中
        
        this.addContent();
        
        this.setVisible(true);
    }
    
    
    public void addContent(){
        Container con = this.getContentPane();
        con.setLayout(new GridLayout(2,3));
        
        JButton btn1 = new JButton("确定1");
        JButton btn2 = new JButton("确定2");
        JButton btn3 = new JButton("确定3");
        JButton btn4 = new JButton("确定4");
        JButton btn5 = new JButton("确定5");
        JButton btn6 = new JButton("确定6");
        JButton btn7 = new JButton("确定7");
        JButton btn8 = new JButton("确定8");
        JButton btn9 = new JButton("确定9");
        
        con.add(btn1);
        con.add(btn2);
        con.add(btn3);
        con.add(btn4);
        con.add(btn5);
        con.add(btn6);
        con.add(btn7);
        con.add(btn8);
        con.add(btn9);
    }
    
    
    public static void main(String[] args) {
        new GridLayoutTest();
    }
    
}

录入学生信息，写入文件，也可以显示学生信息：

package com.io.showStudentInfo;

import java.awt.Color;
import java.awt.Font;
import java.awt.GridLayout;
import java.awt.event.ActionEvent;
import java.awt.event.ActionListener;
import java.util.HashSet;
import java.util.Set;

import javax.swing.BorderFactory;
import javax.swing.JButton;
import javax.swing.JComboBox;
import javax.swing.JFrame;
import javax.swing.JLabel;
import javax.swing.JPanel;
import javax.swing.JScrollBar;
import javax.swing.JScrollPane;
import javax.swing.JTextArea;
import javax.swing.JTextField;

import com.io.showStudentInfo.Student;

/**
//所有面板和首层容器都设置绝对布局，然后面板里边所有东西都设置位置和大小，面板也设置位置和大小，绝对不会错
 * @Author: YuanqiuChen
 * @Date:2016-3-18-下午8:13:57
 * 
 *录入学生信息，写入文件，也可以显示学生信息
 *
 */

public class ShowStudentInfo extends JFrame{

    private JButton saveInfo, showInfo;
    private JLabel laName, laAge, laGender, laScore;
    private JTextField textName, textAge, textScore;
    private JTextArea showText;
    private JComboBox boxGender;

    private Set<Student> allStu = new HashSet<Student>();    
    
    public ShowStudentInfo(){
        init();
//        this.pack();
        this.setSize(350, 600);
        
        this.setTitle("学生信息录入系统");
        this.setLocationRelativeTo(null);
        this.setResizable(false);
        this.setVisible(true);
        this.setDefaultCloseOperation(JFrame.EXIT_ON_CLOSE);
    
    }
    
    //初始化
    private void init(){
        addContent();
        addEventHandler();
    }
    
    private void addContent() {
        JPanel mianBan1 = new JPanel();
        mianBan1.setLayout(null);
        
        saveInfo = new JButton("录入信息");
        saveInfo.setBounds(60, 200, 100, 35);
        saveInfo.setFont(new Font("宋体", Font.PLAIN, 16));
        
        showInfo = new JButton("显示信息");
        showInfo.setBounds(180, 200, 100, 35);
        showInfo.setFont(new Font("宋体", Font.PLAIN, 16));
        
        laName = new JLabel("姓名:");
        laName.setBounds(40, 40, 80, 35);
        laName.setFont(new Font("宋体", Font.PLAIN, 20));
        
        laAge = new JLabel("年龄:");
        laAge.setBounds(40, 80, 80, 35);
        laAge.setFont(new Font("宋体", Font.PLAIN, 20));
        
        laGender = new JLabel("性别:");
        laGender.setBounds(40, 160, 80, 35);
        laGender.setFont(new Font("宋体", Font.PLAIN, 20));
        
        laScore = new JLabel("成绩:");
        laScore.setBounds(40,120, 80, 35);
        laScore.setFont(new Font("宋体", Font.PLAIN, 20));
        
        textName = new JTextField();
        textName.setBounds(120,40, 175, 35);
        textName.setFont(new Font("宋体", Font.PLAIN, 20));
        
        textAge = new JTextField();
        textAge.setBounds(120,80, 175, 35);
        textAge.setFont(new Font("宋体", Font.PLAIN, 20));
        
        textScore = new JTextField();
        textScore.setBounds(120,120, 175, 35);
        textScore.setFont(new Font("宋体", Font.PLAIN, 20));
        
        boxGender = new JComboBox(new String[]{"男","女"});
        boxGender.setBounds(120,160, 75, 35);
        boxGender.setFont(new Font("宋体", Font.PLAIN, 20));
        
        //文本域
        showText = new JTextArea();
//        showText.setBounds(10, 250, 320, 300);//
        showText.setFont(new Font("宋体", Font.PLAIN, 20));
        showText.setBorder(BorderFactory.createLineBorder(Color.BLACK));
    
        //设置不可以直接编辑JTextArea里的内容，可以复制
        showText.setEditable(false);
        
        //设置自动换行
//        showText.setLineWrap(true);
    
        //实现滚动，后边两个是初始化视图显示水平和垂直滚动条
//        JScrollPane mianBan2=new JScrollPane(showText,JScrollPane.VERTICAL_SCROLLBAR_ALWAYS,JScrollPane.HORIZONTAL_SCROLLBAR_ALWAYS);
        JScrollPane mianBan2=new JScrollPane(showText);
        mianBan2.setBounds(10, 250, 320, 300);
        
        
        mianBan1.add(laName);mianBan1.add(textName);
        mianBan1.add(laAge);mianBan1.add(textAge);
        mianBan1.add(laGender);mianBan1.add(boxGender);
        mianBan1.add(laScore);mianBan1.add(textScore);
        mianBan1.add(saveInfo);mianBan1.add(showInfo);
        
//        mianBan1.setBounds(0, 0, 340, 250);
        
//        this.setLayout(null);
        this.add(mianBan2);
        this.add(mianBan1);
        
    }
    
    private void addEventHandler() {
        this.saveInfo.addActionListener(new ActionListener() {
            public void actionPerformed(ActionEvent e) {
                showText.setText("");
                if(textName.getText().trim().equals("")){
                    showText.setText("请输入姓名！");
                    return;
                }
                if(!(textAge.getText().trim().matches("[1-9]{1}[0-9]?"))){
                    showText.setText("请输入有效年龄！(1-99)");
                    return;
                }
                if(!(textScore.getText().trim().matches("(0|100|[1-9]{1}[0-9]?)"))){
                    showText.setText("请输入有效成绩！(0-100)");
                    return;
                }
                String gender = (String)boxGender.getSelectedItem();
                
                allStu = StudentStream.readStudents("file/student.txt");
                
                allStu.add(new Student(textName.getText(), Integer.parseInt(textAge.getText()), gender, Integer.parseInt(textScore.getText())));
                StudentStream.saveStudents(allStu, "file/student.txt");
                showText.setText("存入成功");
                
            }});
        
        this.showInfo.addActionListener(new ActionListener() {
            public void actionPerformed(ActionEvent e) {
                allStu = StudentStream.readStudents("file/student.txt");
                showText.setText("");
                
                if(allStu.isEmpty()){
                    showText.setText("还没有任何信息");
                    return;
                }
                
                showText.setText("姓名	年龄	性别	成绩
");
                for(Student su : allStu){
                    showText.append(su.toString() + "
");
                }
            }});
        
    }

    public static void main(String[] args) {
        new ShowStudentInfo();
    }

}

package com.io.showStudentInfo;

import java.io.Serializable;

public class Student implements Serializable{
    
    private String name;
    private int age;
    private String gender;
    private int score;

    
    public Student() {
        super();
    }


    public Student(String name, int age, String gender, int score) {
        super();
        this.name = name;
        this.age = age;
        this.gender = gender;
        this.score = score;
    }


    public int getScore() {
        return score;
    }


    public void setScore(int score) {
        this.score = score;
    }


    public String getName() {
        return name;
    }
    public void setName(String name) {
        this.name = name;
    }
    public int getAge() {
        return age;
    }
    public void setAge(int age) {
        this.age = age;
    }
    public String getGender() {
        return gender;
    }
    public void setGender(String gender) {
        this.gender = gender;
    }
    
    public String toString(){
        
        return this.getName() + "	" + this.getAge() + "	" + this.getGender() + "	" + this.getScore();
        
    }
    
    

}

package com.io.showStudentInfo;

import java.io.File;
import java.io.FileInputStream;
import java.io.FileNotFoundException;
import java.io.FileOutputStream;
import java.io.FileReader;
import java.io.IOException;
import java.io.InputStream;
import java.io.ObjectInputStream;
import java.io.ObjectOutputStream;
import java.io.OutputStream;
import java.util.HashSet;
import java.util.Set;

import com.io.showStudentInfo.Student;

/**
 * Date: 2016-3-18-下午4:00:53
 * Class_name: StudentStream.java
 * Package_name: com.lovo.demo_17_2
 * Author: ZhangYue
 * Description: 
 */
public class StudentStream {
    
    public static void saveStudents(Set<Student> allStu, String filePath){
        try {
            
            File  file= new File(filePath);
            if(!file.exists()){
                file.createNewFile();
            }
            
            ObjectOutputStream out = new ObjectOutputStream(new FileOutputStream(file));
            
            out.writeObject(allStu);
            
            out.close();
        } catch (FileNotFoundException e) {
            e.printStackTrace();
        } catch (IOException e) {
            // TODO Auto-generated catch block
            e.printStackTrace();
        }
    }

    @SuppressWarnings("unused")
    public static Set<Student> readStudents(String filePath){
    
        try {
            
            //三种方法，判断文件是否为空
            if(new File(filePath).length() == 0){
                return new HashSet<Student>();
            }                
//            if(new FileInputStream(new File(filePath)).read() == -1){
//                return new HashSet<Student>();
//            }    
//            if(new FileInputStream(new File(filePath)).available() == 0){
//                return new HashSet<Student>();
//            }


            ObjectInputStream inObj = new ObjectInputStream(new FileInputStream(filePath));
            
            Object obj = inObj.readObject();
            
            @SuppressWarnings("unchecked")
            Set<Student> stu = (Set<Student>)obj;
            
            inObj.close();
            return stu;
        } catch (FileNotFoundException e) {
            e.printStackTrace();
        } catch (IOException e) {
            e.printStackTrace();
        } catch (ClassNotFoundException e) {
            e.printStackTrace();
        }
        
        return null;
    }
}