java高级程序设计（第二周）

第二学习了事件处理和Swing组件。并学习了给Swing组件添加事件监听器。我学习的是组合框JComboBox类。在创建组合框时可用构造方法JComboBox(Object[] items)直接初始化组合框包含的选项，还可以使用setModel(ComBoxModel aModel)初始化和addItem(Object item)和insertItemAt(Object item, int index)等方法添加或插入选项。用到的方法有：
addItem(Object item);向选项列表尾部添加选项。
insertItemAt(Object item, int index);向列表指定位置添加选项，索引值从0开始计数。
removeItem(Object item, int index)/removeItem(int index);从选项列表中移除指定的选项，分别按对象名和索引值移除。
removeAllItems();移除选项列表中所有选项。
setSelectedItem(Object item)/setSelectedItem(int index);将指定的选项设置为组合框默认选项，分别按照对象和索引值移除。
setMaximumRoxCount(int count);设置选项最大的显示行数，默认为八行。
setEditable(Boolean isEdit);设置选泽框可否编辑，默认为不可编辑，即false.
添加组合框后在其下添加事件监听器并有相应时间响应。
package good;

import java.awt.BorderLayout;
import java.awt.Color;
import java.awt.Dimension;
import java.awt.Toolkit;
import java.awt.event.ActionEvent;
import java.awt.event.ActionListener;

import javax.swing.JButton;
import javax.swing.JComboBox;
import javax.swing.JDialog;
import javax.swing.JFrame;
import javax.swing.JLabel;
import javax.swing.JList;
import javax.swing.JOptionPane;
import javax.swing.JPanel;
import javax.swing.JPasswordField;
import javax.swing.JTextField;
import javax.swing.border.EmptyBorder;

public class good {

public good()
{
    makeFrame();
}

 private void makeFrame()
    {
        
        

        
        
        final String username ="王伟华";
        final String username1 ="林妹妹";
        final String username2 ="111";
		final String passwrod = "111";
		final JFrame jFrame = new JFrame("信息匹配");
		JDialog jd = new JDialog(jFrame, "登陆成功");
		JPanel contentPane1 = (JPanel)jFrame.getContentPane();
	    contentPane1.setBorder(new EmptyBorder(6, 6, 6, 6));
		Dimension dimension = Toolkit.getDefaultToolkit().getScreenSize();
		jFrame.setBounds(((int)dimension.getWidth() - 200) / 2, ((int)dimension.getHeight() - 300) / 2, 250, 200);
		jFrame.setResizable(false);
		jFrame.setLayout(null);
		jFrame.setDefaultCloseOperation(JFrame.EXIT_ON_CLOSE);
		
		
		String[] likes = {"王伟华","林妹妹","111","222"};
		JComboBox comboBox = new JComboBox(likes);
		comboBox.setEditable(true);
		comboBox.setMaximumRowCount(6);
		comboBox.setBounds(80, 25, 130, 20);
		jFrame.add(comboBox);
		comboBox.addActionListener(new ActionListener(){

			@Override
			public void actionPerformed(ActionEvent e) {
				JComboBox comboBox = (JComboBox)e.getSource();
		        String petName = (String)comboBox.getSelectedItem();
		        String petName1 = (String)comboBox.getToolTipText();
		        updateLabel(petName);
				System.out.println(petName); 
				System.out.println(petName1);
			}

			public void updateLabel(String petName) {
				// TODO Auto-generated method stub
				
			}});
		
		String petName = (String)comboBox.getSelectedItem();
        updateLabel(petName);
		
		
		
		JLabel label1 = new JLabel("姓名");
		label1.setBounds(30, 20, 100, 30);
		jFrame.add(label1);
		
		JLabel label2 = new JLabel("密码");
		label2.setBounds(30, 50, 100, 30);
		jFrame.add(label2);
		
		
		
		final JPasswordField text2 = new JPasswordField("111");
		text2.setBounds(80, 55, 130, 20);
		jFrame.add(text2);
		
		JButton button = new JButton("登陆");
		 button.setBackground(Color.gray);
		button.setBounds(40, 95, 170, 50);
		button.addActionListener(new ActionListener() {
			
			@SuppressWarnings("deprecation")
			@Override
			public void actionPerformed(ActionEvent e) {
				  if(       (username.equals(petName)&&passwrod.equals(text2.getText()))
						  ||(username1.equals(petName)&&passwrod.equals(text2.getText()))
						  ||(username2.equals(petName) &&passwrod.equals(text2.getText()))) {
				
				
				
						                                                              
					JOptionPane.showMessageDialog(null, "正确", "提示", JOptionPane. INFORMATION_MESSAGE);
				} else {
					JOptionPane.showMessageDialog(null, "错误", "提示", JOptionPane.ERROR_MESSAGE);
					
					text2.setText("");
				}
			}
		});
		jFrame.add(button);
		jFrame.setVisible(true);     
      
    }


private void updateLabel(String petName) {
	// TODO Auto-generated method stub
	
}

public static void main(String[] args) {
	// TODO Auto-generated method stub
    new good();
}

}