孔维滢 20171010110《面向对象程序设计（java）》第十五周学习总结
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实验十五 GUI编程练习与应用程序部署
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：
测试程序1
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();//构建一个ResourceTestFrame类对象
frame.setTitle("ResourceTest");//设置Title属性，确定框架标题栏中的文字
frame.setDefaultCloseOperation(JFrame.EXIT_ON_CLOSE);//设置默认关闭操作，退出并关闭
frame.setVisible(true);//设置Visible属性，组件可见
});
}
}
/**
* 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);
//利用about.gif图像文件制作图标
URL aboutURL = getClass().getResource("about.gif");
Image img = new ImageIcon(aboutURL).getImage();
//在找到ResourceTest类的地方查找about.gif文件
setIconImage(img);
JTextArea textArea = new JTextArea();
//读取about.txt文件
InputStream stream = getClass().getResourceAsStream("about.txt");
try (Scanner in = new Scanner(stream, "UTF-8"))
{
while (in.hasNext())
textArea.append(in.nextLine() + "
");
}
add(textArea);
}
}
测试程序2
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。
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))
{
settings.store(out, "Program Properties");
}
catch (IOException ex)
{
ex.printStackTrace();
}
System.exit(0);
}
});
}
}
测试程序3
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()
{
// 从首选项获取位置、大小和标题
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());
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)
{
try
{
InputStream in = new FileInputStream(chooser
.getSelectedFile());
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());
}
}
测试程序4
package webstart;
import java.awt.*;
import java.awt.event.*;
import javax.swing.*;
import javax.swing.text.*;
/**
带有计算器按钮和结果显示的面板。
*/
public class CalculatorPanel extends JPanel
{
private JTextArea display;
private JPanel panel;
private double result;
private String lastCommand;
private boolean start;
/**
布置面板。
*/
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);
}
/**
获取历史文本。
@return the calculator history
*/
public String getText()
{
return display.getText();
}
/**
向历史文本追加字符串。
@param s the string to append
*/
public void append(String s)
{
display.append(s);
}
/**
向中心面板添加一个按钮。
@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);
}
/**
此操作将按钮操作字符串插入到显示文本的末尾。
*/
private class InsertAction implements ActionListener
{
public void actionPerformed(ActionEvent event)
{
String input = event.getActionCommand();
start = false;
display.append(input);
}
}
/**
该操作执行按钮操作字符串表示的命令。
*/
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("
");
start = true;
}
catch (BadLocationException e)
{
e.printStackTrace();
}
}
}
}
/**
执行暂挂计算。
@param x与先前结果累积的值。
*/
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;
}
}
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;
/**
* 带有计算器面板和菜单的框架，用于装载和保存计算器历史记录。
*/
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();
}
/**
* 从持久存储获取标题，或者在没有优先条目的情况下向用户请求标题
* 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);
}
}
/**
* 打开历史文件并更新显示。
*/
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);
}
}
/**
* 将计算器历史保存到文件中。
*/
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 javax.swing.*;
/**
* 具有计算历史的计算器，可以作为Java Web Start应用程序部署。
* @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);
});
}
}
实验2：GUI综合编程练习
练习1：
package ID;
import java.io.BufferedReader;
import java.io.FileNotFoundException;
import java.io.FileReader;
import java.io.IOException;
import java.util.ArrayList;
import java.util.Collections;
import java.util.Scanner;
import java.util.TimerTask;
import javax.swing.*;
import java.awt.event.*;
public class Main extends JFrame {
private static ArrayList studentlist;
private static ArrayList<Student> list;
private JPanel buttonPanel;
Scanner scanner = new Scanner(System.in);
public Main() {
studentlist = new ArrayList<>();
JTextArea jt = new JTextArea();
jt.setBounds(300, 100, 800, 600);
buttonPanel = new JPanel();
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");
buttonPanel.setLayout(null);
jButton.setBounds(0, 50, 100, 30);
jButton1.setBounds(0, 100, 160, 30);
lab2.setBounds(0, 200, 100, 30);
lab.setBounds(0, 150, 150, 30);
jt1.setBounds(150, 150, 100, 30);
lab1.setBounds(0, 250, 150, 30);
jt2.setBounds(100, 250, 160, 30);
jt3.setBounds(100, 200, 160, 30);
jButton2.setBounds(0, 300, 60, 30);
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);
buttonPanel.add(jt);
try {
BufferedReader in = new BufferedReader(new FileReader("身份证号.txt"));
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();
}
jButton.addActionListener(new ActionListener() {
public void actionPerformed(ActionEvent e) {
jt.setText(null);
Collections.sort(studentlist);
jt.setText(studentlist.toString());
// jt.append(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 = ((Student) 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 (((Student) 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 - ((Student) studentlist.get(near)).getage();
jt.setText("年龄相近：" + studentlist.get(near));
}
});
jt3.addKeyListener(new KeyAdapter() {
public void keyTyped(KeyEvent e) {
list = new ArrayList<>();
Collections.sort(studentlist);
String key = jt3.getText();
for (int i = 1; i < studentlist.size(); i++) {
if (((Student) studentlist.get(i)).getnumber().contains(key)) {
list.add((Student) studentlist.get(i));
jt.setText("你可能是：
" + list);
}
}
}
});
}
public static int agenear(int age) {
int min = 53, value = 0, k = 0;
for (int i = 0; i < studentlist.size(); i++) {
value = ((Student) studentlist.get(i)).getage() - age;
if (value < 0)
value = -value;
if (value < min) {
min = value;
k = i;
}
}
return k;
}
}
package ID;
import java.awt.*;
import javax.swing.*;
public class ButtonTest
{
public static void main(String[] args)
{
EventQueue.invokeLater(() -> {
JFrame frame = new Main();
frame.setTitle("身份查询");
frame.setBounds(50, 50, 500, 500);
frame.setDefaultCloseOperation(JFrame.EXIT_ON_CLOSE);
frame.setVisible(true);
});
}
}
package ID;
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) {
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+"
";
}
}
练习2：
package 答题;
import java.awt.*;
import java.awt.event.*;
import java.util.Calendar;
import java.util.GregorianCalendar;
import java.util.Random;
import javax.swing.*;
public class Exam extends JFrame {
JPanel p=new JPanel();
JLabel timeLabel=new JLabel("开始计时：");
JLabel time=new JLabel();//显示时间*/
JLabel[] label1=new JLabel[10];//第几题目
JLabel[] label2=new JLabel[10];//第一个运算数
JLabel[] label3=new JLabel[10];//+_*/ 号
JLabel[] label4=new JLabel[10];//第二个运算数
JLabel[] label5=new JLabel[10];// =号
JTextField[] field=new JTextField[10];//运算结果
JLabel[] label6=new JLabel[10]; //对、错的符号（V 、 X）
String[] btn_name= {"重置","提交","重考"};
JButton[] btn=new JButton[3];
Panel2 panel2=null;
int ExamCount=0;//已考试几次
JLabel examLabel=new JLabel();//已考试几次的显示标签
double[] result=new double[10];//存储计算10条题所得答案
public static void main(String[] args) {
new Exam("简单测试系统").setVisible(true);
}
/*public void setTime() {
new T().start();
}*/
public Exam(String title) {
setTitle(title);
setLocationRelativeTo(null);
setDefaultCloseOperation(3);
setSize(400,500);
setResizable(false);
setForeground(Color.blue);
add(new Panel1(),BorderLayout.NORTH);
panel2=new Panel2();
add(new JScrollPane(panel2));
add(new Panel3(),BorderLayout.WEST);
}
public void startExam() {
int num1=0;
int num2=0;
String[] quots= {"+","-","*","/"};
String quot=null;
Random ran=null;
ran=new Random(System.currentTimeMillis());
Box box=Box.createVerticalBox();
for(int i=0;i<10;i++) {
num1=ran.nextInt(100)+1;//排除运算数 0
num2=ran.nextInt(100)+1;
int n=ran.nextInt(4);
quot=new String(quots[n]);//得到随机+-*/ 符号
switch(quot) {
case "+":
result[i]=num1+num2;
break;
case "-":
result[i]=num1-num2;
break;
case "*":
result[i]=num1*num2;
break;
case "/":
result[i]=num1/(num2*1.0);
result[i]=Math.round(result[i]*100)/100.0;
break;
}
label1[i]=new JLabel("第"+(i+1)+"题：");
label2[i]=new JLabel(num1+"");
label3[i]=new JLabel(quot);
label4[i]=new JLabel(num2+"");
label5[i]=new JLabel("=");
field[i]=new JTextField();
field[i].setPreferredSize(new Dimension(60,20));
field[i].addKeyListener(new KeyAdapter() {
public void keyTyped(KeyEvent ee) {
if((ee.getKeyChar()>‘9‘ || ee.getKeyChar()<‘0‘) && ee.getKeyChar()!=45 && ee.getKeyChar()!=‘.‘) {
ee.consume();
}
}
});
label6[i]=new JLabel("");
Box hbox=Box.createHorizontalBox();
hbox.add(label1[i]); //题目
hbox.add(Box.createHorizontalStrut(20));
hbox.add(label2[i]); // 1运算数
hbox.add(Box.createHorizontalStrut(5));
hbox.add(label3[i]); // +_*/号
hbox.add(Box.createHorizontalStrut(5));
hbox.add(label4[i]); // 2运算数
hbox.add(Box.createHorizontalStrut(5));
hbox.add(label5[i]); // =号
hbox.add(Box.createHorizontalStrut(5));
hbox.add(field[i]); //所填的结果
hbox.add(Box.createHorizontalStrut(20));
hbox.add(label6[i]);
box.add(hbox);
box.add(Box.createVerticalStrut(20));
}
panel2.add(box);
panel2.validate();
}
int submitCount=0;//提交次数
class Listener implements ActionListener{
public void actionPerformed(ActionEvent e) {
JButton button=(JButton)e.getSource();
if(button==btn[0]) {
//setTime();
startExam();
ExamCount++;
btn[0].setEnabled(false);
examLabel.setText("现在开始考试，开始倒计时间！");
for(int i=1;i<4;i++) {
btn[i].setEnabled(true);
}
}
if(button==btn[1]) {
for(int i=0;i<10;i++) {
field[i].setText("");
}
}
if(button==btn[2] ) {
rightResultCount=0;
btn[2].setEnabled(false);
double yourResult=0;//每条题目所填答案
for(int i=0;i<10;i++) {
try {
yourResult=Double.parseDouble(field[i].getText().trim());
}catch(Exception ee) {}
if(yourResult==result[i]) {
rightResultCount++;
label6[i].setText("V");
label6[i].setForeground(Color.BLUE);
}else {
label6[i].setText("X");
label6[i].setForeground(Color.RED);
}
}
examLabel.setText("你答对了 "+rightResultCount+
" 道题，答错了"+(10-rightResultCount)+" 道题！"+
"考试得分是： "+rightResultCount*10+" 分！");
}
if(button==btn[3]) {
btn[2].setEnabled(true);
panel2.removeAll();
startExam();
ExamCount++;
examLabel.setText("你已经考试第 "+ExamCount+" 次");
btn[3].setEnabled(false);
for(int i=0;i<10;i++) {
field[i].setText("");
label6[i].setText("");
}
panel2.repaint();
panel2.validate();
}
if(btn[2].isEnabled()==false && btn[3].isEnabled()==false) {
btn[1].setEnabled(false);
}
}
}
class Panel1 extends JPanel{
public Panel1() {
setPreferredSize(new Dimension(350,120));
setLayout(new GridLayout(3,1,10,10));
JTextArea area=new JTextArea("答案中有小数的，保留2位！");
area.setLineWrap(true);
area.setEditable(false);
add(area);
add(examLabel);
//p.add(timeLabel);
//p.add(time);
add(p);
}
}
class Panel2 extends JPanel{
public Panel2() {
setPreferredSize(new Dimension(400,600));
}
}
class Panel3 extends JPanel{
public Panel3() {
setPreferredSize(new Dimension(50,100));
setBackground(Color.LIGHT_GRAY);
for(int i=0;i<4;i++) {
btn[i]=new JButton(btn_name[i]);
btn[i].addActionListener(new Listener());
add(btn[i]);
if(i>0) {
btn[i].setEnabled(false);
}
}
}
}
}
实验总结：
1.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。.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命令格式：jar {ctxui} [vfm0Me] [jar-file] [manifest-file] [entry-point] [-C dir] files ...
创建JAR文件：jar cf jar-file input-file(s)
c---want to Create a JAR file.
查看JAR文件：jar tf jar-file
t---want to view the Table of contents of the JAR file.
提取JAR文件：jar xf jar-file [archived-file(s)]
x---want to extract files from the JAR archive.
更新JAR文件：jar uf jar-file input-file(s)
u---want to update an existing JAR file.
索引JAR文件：jar i jar-file
i---index an existing JAR file.
运行JAR文件：（1）用户可以通过命令来启动应用程序： java –jar MyProgram.jar
（2）窗口操作系统，可通过双击JAR文件图标来启动应用程序。
资源：
Java 中，应用程序使的类通常需要一些相关数 中，应用程序使的类通常需要一些相关数 据文件，这些称为资源 (Resource) 。
–图像和声音文件。
–带有消息字符串和按钮标签的文本件。 带有消息字符串和按钮标签的文本件。 带有消息字符串和按钮标签的文本件。
–二进制数据文件，如：描述地图布局的。 二进制数据文件，如：描述地图布局的。 二进制数据文件，如：描述地图布局的。
javac ResourceTest.java
– jar cvfm ResourceTest.jar ResourceTest.mf *.class *.gif *.txt
– java –jar ResourceTest.jar
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