实验十五 GUI编程练习与应用程序部署
实验时间 2018-12-6
1、实验目的与要求
(1) 掌握Java应用程序的打包操作；
(2) 了解应用程序存储配置信息的两种方法；
(3) 掌握基于JNLP协议的java Web Start应用程序的发布方法；
(5) 掌握Java GUI 编程技术。
2、实验内容和步骤
实验1： 导入第13章示例程序，测试程序并进行代码注释。
测试程序1
l 在elipse IDE中调试运行教材585页程序13-1，结合程序运行结果理解程序；
l 将所生成的JAR文件移到另外一个不同的目录中，再运行该归档文件，以便确认程序是从JAR文件中，而不是从当前目录中读取的资源。
l 掌握创建JAR文件的方法；
源代码的注释
package resource; import java.awt.*; import java.io.*; import java.net.*; import java.util.*; import javax.swing.*; /** * @version 1.41 2015-06-12 * @author Cay Horstmann */ public class ResourceTest { public static void main(String[] args) { EventQueue.invokeLater(() -> { JFrame frame = new ResourceTestFrame(); frame.setTitle("ResourceTest"); frame.setDefaultCloseOperation(JFrame.EXIT_ON_CLOSE); frame.setVisible(true); }); } } /** * A frame that loads image and text resources. */ class ResourceTestFrame extends JFrame { private static final int DEFAULT_WIDTH = 300; private static final int DEFAULT_HEIGHT = 300; public ResourceTestFrame() { setSize(DEFAULT_WIDTH, DEFAULT_HEIGHT); URL aboutURL = getClass().getResource("about.gif"); Image img = new ImageIcon(aboutURL).getImage(); //根据指定的 URL 创建一个 ImageIcon。使用 MediaTracker 预载图像以监视图像的加载状态。图标的描述被初始化为 URL 的字符串表示形式。 setIconImage(img); //窗口图标显示的图像 JTextArea textArea = new JTextArea();//构造新的 TextArea。设置默认的模型，初始字符串为 null，行/列设置为 0。 InputStream stream = getClass().getResourceAsStream("about.txt"); try (Scanner in = new Scanner(stream, "UTF-8"))//构造一个新的 Scanner，它生成的值是从指定的输入流扫描的。 { while (in.hasNext()) textArea.append(in.nextLine() + " "); } add(textArea); } }
测试程序2
l 在elipse IDE中调试运行教材583页-584程序13-2，结合程序运行结果理解程序；
l 了解Properties类中常用的方法；
源代码的注释：
package properties; import java.awt.EventQueue; import java.awt.event.*; import java.io.*; import java.util.Properties; import javax.swing.*; /** * A program to test properties. The program remembers the frame position, size, * and title. * @version 1.01 2015-06-16 * @author Cay Horstmann */ public class PropertiesTest { public static void main(String[] args) { EventQueue.invokeLater(() -> { PropertiesFrame frame = new PropertiesFrame(); frame.setVisible(true); }); } } /** * A frame that restores position and size from a properties file and updates * the properties upon exit. */ class PropertiesFrame extends JFrame { private static final int DEFAULT_WIDTH = 300; private static final int DEFAULT_HEIGHT = 200; private File propertiesFile; private Properties settings; public PropertiesFrame() { // 从属性中获取位置、大小和标题 String userDir = System.getProperty("user.home"); File propertiesDir = new File(userDir, ".corejava"); if (!propertiesDir.exists()) propertiesDir.mkdir(); propertiesFile = new File(propertiesDir, "program.properties"); Properties defaultSettings = new Properties(); defaultSettings.setProperty("left", "0"); defaultSettings.setProperty("top", "0"); defaultSettings.setProperty("width", "" + DEFAULT_WIDTH); defaultSettings.setProperty("height", "" + DEFAULT_HEIGHT); defaultSettings.setProperty("title", ""); settings = new Properties(defaultSettings); if (propertiesFile.exists()) try (InputStream in = new FileInputStream(propertiesFile)) { settings.load(in); } catch (IOException ex) { ex.printStackTrace(); } int left = Integer.parseInt(settings.getProperty("left")); int top = Integer.parseInt(settings.getProperty("top")); int width = Integer.parseInt(settings.getProperty("width")); int height = Integer.parseInt(settings.getProperty("height")); setBounds(left, top, width, height); //如果没有标题，询问用户 String title = settings.getProperty("title"); if (title.equals("")) title = JOptionPane.showInputDialog("Please supply a frame title:"); if (title == null) title = ""; setTitle(title); //添加指定的窗口侦听器，以从此窗口接收窗口事件。如果 l 为 null，则不抛出任何异常，且不执行任何操作。 addWindowListener(new WindowAdapter() { public void windowClosing(WindowEvent event) { settings.setProperty("left", "" + getX()); settings.setProperty("top", "" + getY()); settings.setProperty("width", "" + getWidth()); settings.setProperty("height", "" + getHeight()); settings.setProperty("title", getTitle()); try (OutputStream out = new FileOutputStream(propertiesFile)) //此抽象类是表示输出字节流的所有类的超类。输出流接受输出字节并将这些字节发送到某个接收器。 { settings.store(out, "Program Properties"); } catch (IOException ex)//当发生某种 I/O 异常时，抛出此异常。 { ex.printStackTrace(); } System.exit(0); } }); } }
测试程序3
l 在elipse IDE中调试运行教材593页-594程序13-3，结合程序运行结果理解程序；
l 了解Preferences类中常用的方法；
测试程序4
源代码的注释：
package preferences; import java.awt.*; import java.io.*; import java.util.prefs.*; import javax.swing.*; import javax.swing.filechooser.*; /** * A program to test preference settings. The program remembers the frame * position, size, and title. * @version 1.03 2015-06-12 * @author Cay Horstmann */ public class PreferencesTest { public static void main(String[] args) { EventQueue.invokeLater(() -> { PreferencesFrame frame = new PreferencesFrame(); frame.setDefaultCloseOperation(JFrame.EXIT_ON_CLOSE); frame.setVisible(true); }); } } /** * A frame that restores position and size from user preferences and updates the * preferences upon exit. */ class PreferencesFrame extends JFrame { private static final int DEFAULT_WIDTH = 300; private static final int DEFAULT_HEIGHT = 200; private Preferences root = Preferences.userRoot(); private Preferences node = root.node("/com/horstmann/corejava"); public PreferencesFrame() { // get position, size, title from preferences int left = node.getInt("left", 0); int top = node.getInt("top", 0); int width = node.getInt("width", DEFAULT_WIDTH); int height = node.getInt("height", DEFAULT_HEIGHT); setBounds(left, top, width, height); // 如果没有标题，询问用户 String title = node.get("title", ""); if (title.equals("")) title = JOptionPane.showInputDialog("Please supply a frame title:"); if (title == null) title = ""; setTitle(title); // 设置显示XML文件的文件选择器 final JFileChooser chooser = new JFileChooser(); chooser.setCurrentDirectory(new File(".")); chooser.setFileFilter(new FileNameExtensionFilter("XML files", "xml")); // 设置菜单 JMenuBar menuBar = new JMenuBar(); setJMenuBar(menuBar); JMenu menu = new JMenu("File"); menuBar.add(menu); JMenuItem exportItem = new JMenuItem("Export preferences"); menu.add(exportItem); exportItem .addActionListener(event -> { if (chooser.showSaveDialog(PreferencesFrame.this) == JFileChooser.APPROVE_OPTION) { try { savePreferences(); OutputStream out = new FileOutputStream(chooser .getSelectedFile()); //创建一个向指定 File 对象表示的文件中写入数据的文件输出流。创建一个新 FileDescriptor 对象来表示此文件连接。 node.exportSubtree(out); out.close(); } catch (Exception e) { e.printStackTrace(); } } }); JMenuItem importItem = new JMenuItem("Import preferences"); menu.add(importItem); importItem .addActionListener(event -> { if (chooser.showOpenDialog(PreferencesFrame.this) == JFileChooser.APPROVE_OPTION) //弹出一个 "Open File" 文件选择器对话框 { try { InputStream in = new FileInputStream(chooser .getSelectedFile()); //此抽象类是表示字节输入流的所有类的超类。 Preferences.importPreferences(in); in.close(); } catch (Exception e) { e.printStackTrace(); } } }); JMenuItem exitItem = new JMenuItem("Exit"); menu.add(exitItem); exitItem.addActionListener(event -> { savePreferences(); System.exit(0); }); } public void savePreferences() { node.putInt("left", getX()); node.putInt("top", getY()); node.putInt("width", getWidth()); node.putInt("height", getHeight()); node.put("title", getTitle()); } }
l 在elipse IDE中调试运行教材619页-622程序13-6，结合程序运行结果理解程序；
l 掌握基于JNLP协议的java Web Start应用程序的发布方法。
源代码的注释：
package webstart; import java.awt.*; import javax.swing.*; /** * A calculator with a calculation history that can be deployed as a Java Web Start application. * @version 1.04 2015-06-12 * @author Cay Horstmann */ public class Calculator { public static void main(String[] args) { EventQueue.invokeLater(() -> { CalculatorFrame frame = new CalculatorFrame(); frame.setDefaultCloseOperation(JFrame.EXIT_ON_CLOSE); frame.setVisible(true); }); } }
package webstart; import java.io.BufferedReader; import java.io.ByteArrayInputStream; import java.io.ByteArrayOutputStream; import java.io.FileNotFoundException; import java.io.IOException; import java.io.InputStream; import java.io.InputStreamReader; import java.io.OutputStream; import java.io.PrintStream; import java.net.MalformedURLException; import java.net.URL; import javax.jnlp.BasicService; import javax.jnlp.FileContents; import javax.jnlp.FileOpenService; import javax.jnlp.FileSaveService; import javax.jnlp.PersistenceService; import javax.jnlp.ServiceManager; import javax.jnlp.UnavailableServiceException; import javax.swing.JFrame; import javax.swing.JMenu; import javax.swing.JMenuBar; import javax.swing.JMenuItem; import javax.swing.JOptionPane; /** * A frame with a calculator panel and a menu to load and save the calculator history. */ public class CalculatorFrame extends JFrame { private CalculatorPanel panel; public CalculatorFrame() { setTitle(); panel = new CalculatorPanel(); add(panel); JMenu fileMenu = new JMenu("File"); JMenuBar menuBar = new JMenuBar(); menuBar.add(fileMenu); setJMenuBar(menuBar); JMenuItem openItem = fileMenu.add("Open"); openItem.addActionListener(event -> open()); JMenuItem saveItem = fileMenu.add("Save"); saveItem.addActionListener(event -> save()); pack(); } /** * Gets the title from the persistent store or asks the user for the title if there is no prior * entry. */ public void setTitle() { try { String title = null; BasicService basic = (BasicService) ServiceManager.lookup("javax.jnlp.BasicService"); URL codeBase = basic.getCodeBase(); PersistenceService service = (PersistenceService) ServiceManager .lookup("javax.jnlp.PersistenceService"); URL key = new URL(codeBase, "title"); try { FileContents contents = service.get(key); InputStream in = contents.getInputStream(); BufferedReader reader = new BufferedReader(new InputStreamReader(in)); title = reader.readLine(); } catch (FileNotFoundException e) { title = JOptionPane.showInputDialog("Please supply a frame title:"); if (title == null) return; service.create(key, 100); FileContents contents = service.get(key); OutputStream out = contents.getOutputStream(true); PrintStream printOut = new PrintStream(out); printOut.print(title); } setTitle(title); } catch (UnavailableServiceException | IOException e) { JOptionPane.showMessageDialog(this, e); } } /** * Opens a history file and updates the display. */ public void open() { try { FileOpenService service = (FileOpenService) ServiceManager .lookup("javax.jnlp.FileOpenService"); FileContents contents = service.openFileDialog(".", new String[] { "txt" }); JOptionPane.showMessageDialog(this, contents.getName()); if (contents != null) { InputStream in = contents.getInputStream(); BufferedReader reader = new BufferedReader(new InputStreamReader(in)); String line; while ((line = reader.readLine()) != null) { panel.append(line); panel.append(" "); } } } catch (UnavailableServiceException e) { JOptionPane.showMessageDialog(this, e); } catch (IOException e) { JOptionPane.showMessageDialog(this, e); } } /** * Saves the calculator history to a file. */ public void save() { try { ByteArrayOutputStream out = new ByteArrayOutputStream(); PrintStream printOut = new PrintStream(out); printOut.print(panel.getText()); InputStream data = new ByteArrayInputStream(out.toByteArray()); FileSaveService service = (FileSaveService) ServiceManager .lookup("javax.jnlp.FileSaveService"); service.saveFileDialog(".", new String[] { "txt" }, data, "calc.txt"); } catch (UnavailableServiceException e) { JOptionPane.showMessageDialog(this, e); } catch (IOException e) { JOptionPane.showMessageDialog(this, e); } } }
package webstart; import java.awt.*; import java.awt.event.*; import javax.swing.*; import javax.swing.text.*; /** A panel with calculator buttons and a result display. */ public class CalculatorPanel extends JPanel { private JTextArea display; private JPanel panel; private double result; private String lastCommand; private boolean start; /** Lays out the panel. */ public CalculatorPanel() { setLayout(new BorderLayout()); result = 0; lastCommand = "="; start = true; // 添加显示 display = new JTextArea(10, 20); add(new JScrollPane(display), BorderLayout.NORTH); ActionListener insert = new InsertAction(); ActionListener command = new CommandAction(); // 在一个4×4的网格中添加按钮 panel = new JPanel(); panel.setLayout(new GridLayout(4, 4)); addButton("7", insert); addButton("8", insert); addButton("9", insert); addButton("/", command); addButton("4", insert); addButton("5", insert); addButton("6", insert); addButton("*", command); addButton("1", insert); addButton("2", insert); addButton("3", insert); addButton("-", command); addButton("0", insert); addButton(".", insert); addButton("=", command); addButton("+", command); add(panel, BorderLayout.CENTER); } /** Gets the history text. @return the calculator history */ public String getText() { return display.getText(); } /** Appends a string to the history text. @param s the string to append */ public void append(String s) { display.append(s); } /** Adds a button to the center panel. @param label the button label @param listener the button listener */ private void addButton(String label, ActionListener listener) { JButton button = new JButton(label); button.addActionListener(listener); panel.add(button); } /** This action inserts the button action string to the end of the display text. */ private class InsertAction implements ActionListener { public void actionPerformed(ActionEvent event) { String input = event.getActionCommand(); start = false; display.append(input); } } /** This action executes the command that the button action string denotes. */ private class CommandAction implements ActionListener { public void actionPerformed(ActionEvent event) { String command = event.getActionCommand(); if (start) { if (command.equals("-")) { display.append(command); start = false; } else lastCommand = command; } else { try { int lines = display.getLineCount(); int lineStart = display.getLineStartOffset(lines - 1); int lineEnd = display.getLineEndOffset(lines - 1); String value = display.getText(lineStart, lineEnd - lineStart); display.append(" "); display.append(command); calculate(Double.parseDouble(value)); if (command.equals("=")) display.append(" " + result); lastCommand = command; display.append(" ");//将给定文本追加到文档结尾。如果模型为 null 或者字符串为 null 或空，则不执行任何操作 start = true; } catch (BadLocationException e) { e.printStackTrace(); } } } } /** Carries out the pending calculation. @param x the value to be accumulated with the prior result. */ public void calculate(double x) { if (lastCommand.equals("+")) result += x; else if (lastCommand.equals("-")) result -= x; else if (lastCommand.equals("*")) result *= x; else if (lastCommand.equals("/")) result /= x; else if (lastCommand.equals("=")) result = x; } }
实验2：GUI综合编程练习
按实验十四分组名单，组内讨论完成以下编程任务：
练习1：采用GUI界面设计以下程序，并进行部署与发布：
l 编制一个程序，将身份证号.txt 中的信息读入到内存中；
l 按姓名字典序输出人员信息；
l 查询最大年龄的人员信息；
l 查询最小年龄人员信息；
l 输入你的年龄，查询身份证号.txt中年龄与你最近人的姓名、身份证号、年龄、性别和出生地；
l 查询人员中是否有你的同乡。
l 输入身份证信息，查询所提供身份证号的人员信息，要求输入一个身份证数字时，查询界面就显示满足查询条件的查询结果，且随着输入的数字的增多，查询匹配的范围逐渐缩小
package 马兴德; import java.io.BufferedReader; import java.io.File; import java.io.FileInputStream; import java.io.InputStreamReader; import java.io.FileNotFoundException; import java.io.IOException; import java.util.ArrayList; import java.util.Arrays; import java.util.Collections; import java.util.Scanner; import java.awt.*; import javax.swing.*; import java.awt.event.*; public class Main extends JFrame { private static ArrayList<Student> studentlist; private static ArrayList<Student> list; private JPanel panel; private JPanel buttonPanel; private static final int DEFAULT_WITH = 800; private static final int DEFAULT_HEIGHT = 500; public Main() { studentlist = new ArrayList<>(); Scanner scanner = new Scanner(System.in); File file = new File("F:\身份证号.txt"); try { FileInputStream fis = new FileInputStream(file); BufferedReader in = new BufferedReader(new InputStreamReader(fis)); String temp = null; while ((temp = in.readLine()) != null) { Scanner linescanner = new Scanner(temp); linescanner.useDelimiter(" "); String name = linescanner.next(); String number = linescanner.next(); String sex = linescanner.next(); String age = linescanner.next(); String province =linescanner.nextLine(); Student student = new Student(); student.setName(name); student.setnumber(number); student.setsex(sex); int a = Integer.parseInt(age); student.setage(a); student.setprovince(province); studentlist.add(student); } } catch (FileNotFoundException e) { System.out.println("学生信息文件找不到"); e.printStackTrace(); } catch (IOException e) { System.out.println("学生信息文件读取错误"); e.printStackTrace(); } panel = new JPanel(); panel.setLayout(new BorderLayout()); JTextArea jt = new JTextArea(); panel.add(jt); add(panel, BorderLayout.NORTH); buttonPanel = new JPanel(); buttonPanel.setLayout(new GridLayout(1, 7)); JButton jButton = new JButton("字典排序"); JButton jButton1 = new JButton("年龄最大和年龄最小"); JLabel lab = new JLabel("猜猜你的老乡"); JTextField jt1 = new JTextField(); JLabel lab1 = new JLabel("找找同龄人（年龄相近）："); JTextField jt2 = new JTextField(); JLabel lab2 = new JLabel("输入你的身份证号码："); JTextField jt3 = new JTextField(); JButton jButton2 = new JButton("退出"); jButton.setBounds(110, 90, 60, 30); jButton1.setBounds(110, 90, 60, 30); jt1.setBounds(110, 90, 60, 30); jt2.setBounds(110, 90, 60, 30); jt3.setBounds(110, 90, 60, 30); jButton2.setBounds(110, 90, 60, 30); jButton.addActionListener(new ActionListener() { public void actionPerformed(ActionEvent e) { Collections.sort(studentlist); jt.setText(studentlist.toString()); } }); jButton1.addActionListener(new ActionListener() { public void actionPerformed(ActionEvent e) { int max = 0, min = 100; int j, k1 = 0, k2 = 0; for (int i = 1; i < studentlist.size(); i++) { j = studentlist.get(i).getage(); if (j > max) { max = j; k1 = i; } if (j < min) { min = j; k2 = i; } } jt.setText("年龄最大：" + studentlist.get(k1) + "年龄最小：" + studentlist.get(k2)); } }); jButton2.addActionListener(new ActionListener() { public void actionPerformed(ActionEvent e) { dispose(); System.exit(0); } }); jt1.addActionListener(new ActionListener() { public void actionPerformed(ActionEvent e) { String find = jt1.getText(); String text=""; String place = find.substring(0, 3); for (int i = 0; i < studentlist.size(); i++) { if (studentlist.get(i).getprovince().substring(1, 4).equals(place)) { text+=" "+studentlist.get(i); jt.setText("老乡：" + text); } } } }); jt2.addActionListener(new ActionListener() { public void actionPerformed(ActionEvent e) { String yourage = jt2.getText(); int a = Integer.parseInt(yourage); int near = agenear(a); int value = a - studentlist.get(near).getage(); jt.setText("年龄相近：" + studentlist.get(near)); } }); jt3.addActionListener(new ActionListener() { public void actionPerformed(ActionEvent e) { list = new ArrayList<>(); Collections.sort(studentlist); String key = jt3.getText(); for (int i = 1; i < studentlist.size(); i++) { if (studentlist.get(i).getnumber().contains(key)) { list.add(studentlist.get(i)); jt.setText("emmm！你可能是： " + list); } } } }); buttonPanel.add(jButton); buttonPanel.add(jButton1); buttonPanel.add(lab); buttonPanel.add(jt1); buttonPanel.add(lab1); buttonPanel.add(jt2); buttonPanel.add(lab2); buttonPanel.add(jt3); buttonPanel.add(jButton2); add(buttonPanel, BorderLayout.SOUTH); setSize(DEFAULT_WITH, DEFAULT_HEIGHT); } public static int agenear(int age) { int j=0,min=53,value=0,k=0; for (int i = 0; i < studentlist.size(); i++) { value=studentlist.get(i).getage()-age; if(value<0) value=-value; if (value<min) { min=value; k=i; } } return k; } }
package 马兴德; import java.awt.*; import javax.swing.*; import c.v; public class ButtonTest { public static void main(String[] args) { EventQueue.invokeLater(() -> { JFrame frame = new Main(); frame.setTitle("身份证"); frame.setDefaultCloseOperation(JFrame.EXIT_ON_CLOSE); frame.setVisible(true); }); } }
package 马兴德; public class Student implements Comparable<Student> { private String name; private String number ; private String sex ; private int age; private String province; public String getName() { return name; } public void setName(String name) { this.name = name; } public String getnumber() { return number; } public void setnumber(String number) { this.number = number; } public String getsex() { return sex ; } public void setsex(String sex ) { this.sex =sex ; } public int getage() { return age; } public void setage(int age) { // int a = Integer.parseInt(age); this.age= age; } public String getprovince() { return province; } public void setprovince(String province) { this.province=province ; } public int compareTo(Student o) { return this.name.compareTo(o.getName()); } public String toString() { return name+" "+sex+" "+age+" "+number+" "+province+" "; } }
按照省份查找
按照年龄查找
身份证模糊查找
练习2：采用GUI界面设计以下程序，并进行部署与发布
l 编写一个计算器类，可以完成加、减、乘、除的操作
l 利用计算机类，设计一个小学生100以内数的四则运算练习程序，由计算机随机产生10道加减乘除练习题，学生输入答案，由程序检查答案是否正确，每道题正确计10分，错误不计分，10道题测试结束后给出测试总分；
l 将程序中测试练习题及学生答题结果输出到文件，文件名为test.txt。
package 马兴德; import java.awt.Font; import java.awt.event.ActionEvent; import java.awt.event.ActionListener; import java.io.FileNotFoundException; import java.io.PrintWriter; import java.util.Collections; import java.util.Scanner; import javax.swing.*; import java.math.*; public class n extends JFrame { private String[] c=new String[10]; private String[] c1=new String[11]; private int[] list=new int[10]; int i=0,i1=0,sum = 0; private PrintWriter out = null; private JTextArea text,text1; private int counter; public n() { JPanel Panel = new JPanel();Panel.setLayout(null); JLabel JLabel1=new JLabel("...");JLabel1.setBounds(500, 800, 400, 30);JLabel1.setFont(new Font("Courier",Font.PLAIN,35)); JButton Button = new JButton("题目");Button.setBounds(50,150,150,50);Button.setFont(new Font("Courier",Font.PLAIN,20)); Button.addActionListener(new Action()); JButton Button2 = new JButton("确定");Button2.setBounds(300,150,150,50);Button2.setFont(new Font("Courier",Font.PLAIN,20));Button2.addActionListener(new Action1()); JButton Button3 = new JButton("读出文件");Button3.setBounds(500,150,150,50);Button3.setFont(new Font("Courier",Font.PLAIN,20));Button3.addActionListener(new Action2()); text=new JTextArea(30,80);text.setBounds(30, 50, 200, 50);text.setFont(new Font("Courier",Font.PLAIN,35)); text1=new JTextArea(30,80);text1.setBounds(270, 50, 200, 50);text1.setFont(new Font("Courier",Font.PLAIN,35)); Panel.add(text); Panel.add(text1); Panel.add(Button); Panel.add(Button2); Panel.add(Button3); Panel.add(JLabel1); add(Panel); } private class Action implements ActionListener { public void actionPerformed(ActionEvent event) { text1.setText("0"); if(i<11) { int a = 1+(int)(Math.random() * 99); int b = 1+(int)(Math.random() * 99); int m= (int) Math.round(Math.random() * 3); switch(m) { case 1: while(a<b){ b = (int) Math.round(Math.random() * 100);a = (int) Math.round(Math.random() * 100); } c[i]=((i+1)+":"+a+"/"+b+"="); list[(i+1)]=Math.floorDiv(a, b); text.setText((i+1)+":"+a+"/"+b+"="); i++; break; case 2: c[i]=((i+1)+":"+a+"*"+b+"="); list[(i+1)]=Math.multiplyExact(a, b); text.setText((i+1)+":"+a+"*"+b+"="); i++; break; case 3: c[i]=((i+1)+":"+a+"+"+b+"="); list[(i+1)]=Math.addExact(a, b); text.setText((i+1)+":"+a+"+"+b+"="); i++; break ; case 4: while(a<=b){ b = (int) Math.round(Math.random() * 100);a = (int) Math.round(Math.random() * 100); } c[i]=((i+1)+":"+a+"-"+b+"="); text.setText((i+1)+":"+a+"-"+b+"="); list[(i+1)]=Math.subtractExact(a, b); i++; break ; } } } } private class Action1 implements ActionListener { public void actionPerformed(ActionEvent event) { if(i<10) { String daan=text1.getText().toString().trim(); int a = Integer.parseInt(daan); if(text1.getText()!=" ") { if(list[i1]==a) sum+=10; } c1[i1]=daan; i1++; } } } private class Action2 implements ActionListener { public void actionPerformed(ActionEvent event) { try { out = new PrintWriter("text.txt"); } catch (FileNotFoundException e) { e.printStackTrace(); } for(int counter=0;counter<10;counter++) { out.println(c[counter]+c1[counter]); } out.println("成绩"+sum); out.close(); } } }
package 马兴德; import java.awt.Dimension; import java.awt.EventQueue; import java.awt.Toolkit; import javax.swing.JFrame; public class d{ public static void main (String args[]) { Toolkit t=Toolkit.getDefaultToolkit(); Dimension s=t.getScreenSize(); EventQueue.invokeLater(() -> { JFrame frame = new n(); frame.setBounds(0, 0,(int)s.getWidth()/2,(int)s.getHeight()/2); frame.setTitle("大师"); frame.setDefaultCloseOperation(JFrame.EXIT_ON_CLOSE); frame.setVisible(true); }); } }
实验总结：
理论知识部分
JAR文件： Java程序的打包：程序编译完成后，程序员将.class文件压缩打包为.jar文件后，GUI界面程序就可以直接双击图标运行。
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.jar文件（Java归档）既可以包含类文件，也可以包含诸如图像和声音这些其它类型的文件。
JAR文件是压缩的，它使用ZIP压缩格式。JAR文件分为创建JAR文件，查看JAR文件，提取JAR文件和更新JAR文件
清单文件：
每个JAR文件中包含一个用于描述归档特征的清单文件(manifest)。清单文件被命名为MANIFEST.MF，它位于JAR文件的一个特殊的META-INF子目录中。
最小的符合标准的清单文件是很简单的：Manifest-Version：1.0
复杂的清单文件包含多个条目，这些条目被分成多个节。第一节被称为主节，作用于整个JAR文件。随后的条目用来指定已命名条目的属性，可以是文件、包或者URL。清单文件的节与节之间用空行分开，最后一行必须以换行符结束。否则，清单文件将无法被正确地读取。
包密性：将Java包密封(Seal)可保证不会有其它的类加入到其中。如果在代码中使用了包可见的类、方法和字段，就可能希望密封包。如果不密封，其它类就有可能放在这个包中，进而访问包可见的特性。
应用首选项的存储：应用程序用户通常期待能够自行对程序进行配置，并能够将其保存起来，以便日后再次运行该程序时能够读取这些配置。
一般有两种方法：
–将配置信息存储在属性文件中；
–将配置信息存储在中心知识库。
一般有两种方法：–将配置信息存储在属性文件中；
–将配置信息存储在中心知识库。
属性映射：属性映射常被用来存放配置信息，属性映射是一种存储键/值对的数据结构。
属性映射有三个特性：
–键和值都是字符串；
–键/值对易于写入文件或从文件读出；
–用二级表存放默认值。
实现属性映射的Java类被称为Properties。
以上就是对本周新的知识的一个总结，在本周的实验过程中，最后的编程任务还是有点难度的，尤其在模糊查找这儿，自己掌握的还不是特别清楚，在寻求了同学的帮助以及助教的讲解之后，懂得了如何去做。
属性映射有三个特性：–键和值都是字符串；
–键/值对易于写入文件或从文件读出；
–用二级表存放默认值。
实现属性映射的Java类被称为Properties。