刘志梅201771010115.《面向对象程序设计（java）》第十五周学习总结
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)一个JAR文件既可以包含类文件，也可以包含诸如图像和声音这些其他类型的文件。
创建一个新的JAR文件应该使用的常见命令格式：jar cvf JARFileName File1 File2.....
除类文件、图像和其它资源外，每个JAR文件包含一个用于描述归档特征的清单文件，清单文件被命名为MANIFEST.MF。
复杂的清单文件可能包含更多条目，这些清单条目被分成多个节；第一个节被称为主节，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，这些已命名条目可以是某个文件、包或者URL，但都必须是起始于名为Name的条目，节与节之间用空行隔开。
在applet和应用程序中使用的类通常需要使用一些相关的数据文件：图像和声音文件、带有消息字符串和按钮标签的文本文件、二进制数据文件。（在JAVA中，这些关联的文件被称为资源）
类加载器知道如何搜索类文件，直到在类路径、存档文件和web服务器上找到为止。
(2) 属性映射是一种存储键/值对的数据结构。
其有以下三个特性：键和值是字符串、映射可以很容易的存入文件以及从文件加载、有一个二级表保存默认值。
实现属性映射的JAVA类名为Properties；属性映射对于指定程序的配置选项很有用。
使用属性文件的缺点：有些操作系统没有主目录的概念，所以很难找到一个统一的配置文件位置；关于配置文件的命名没有标准约定，用户安装多个JAVA应用时，就更容易发生命名冲突。
有些操作系统有一个存储配置信息的中心存储库，存储库的各个节点分别有一个单独的键/值对表，可以用来存储数值、字符串或字节数组，但不能存储可串行化的对象。
注意，读取信息时必须指定一个默认值，以防止没有可用的存储库数据。
(3) 定义一个接口（或者，也可以定义一个超类），其中包含服务的各个实例应当提供的方法。
实现类可以放在任意包中，而不一定是服务接口所在的包，每个实现类必须有一个无参数构造器。
Applet就是一个扩展了java.applet.Applet类的Java类。
要执行applet，需要完成以下三个步骤：将Java源文件编译为类文件；将类打包到一个JAR文件中；创建一个HTML文件，告诉浏览器首先加载那个类文件，以及如何设定applet的大小。
Applet查看器程序的命令行参数是HTML文件名，而不是类文件。
参数总是作为字符串返回，如果需要数值类型，则需要将字符串转换为数值。
Applet可以处理图像和音频；要用相对URL指定图像和音频文件的位置。
Applet在浏览器或在applet查看器中运行；一个页面可以包含多个applet。
(4) 要想访问与某个特定键关联的信息，需要调用get方法；这个方法将返回一个FileContens对象，通过这个对象可以对键数据进行读写。
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；
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();//在找到ResourceTest类的地方查找about.gif文件 setIconImage(img); JTextArea textArea = new JTextArea(); InputStream stream = getClass().getResourceAsStream("about.txt"); try (Scanner in = new Scanner(stream, "UTF-8"))//将资源文件和类文件放在同一个目录中，还可以将他放在子目录中 { while (in.hasNext()) textArea.append(in.nextLine() + "\n"); } 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；
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() { // get position, size, title from properties String userDir = System.getProperty("user.home");//为程序属性提供默认值 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);//从文件加载属性 } 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); // if no title given, ask user String title = settings.getProperty("title"); if (title.equals("")) title = JOptionPane.showInputDialog("Please supply a frame title:"); if (title == null) title = ""; setTitle(title); 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
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；
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();//返回调用程序的首选项根节点 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); // if no title given, ask user String title = node.get("title", ""); if (title.equals("")) title = JOptionPane.showInputDialog("Please supply a frame title:"); if (title == null) title = ""; setTitle(title); // set up file chooser that shows XML files final JFileChooser chooser = new JFileChooser(); chooser.setCurrentDirectory(new File(".")); chooser.setFileFilter(new FileNameExtensionFilter("XML files", "xml")); // set up menus 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
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。
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("\n"); } } } 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 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.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; // add the display display = new JTextArea(10, 20); add(new JScrollPane(display), BorderLayout.NORTH); ActionListener insert = new InsertAction(); ActionListener command = new CommandAction(); // add the buttons in a 4 x 4 grid 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("\n" + result); lastCommand = command; display.append("\n"); 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：
编制一个程序，将身份证号.txt 中的信息读入到内存中；
按姓名字典序输出人员信息；
查询最大年龄的人员信息；
查询最小年龄人员信息；
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；
查询人员中是否有你的同乡。
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 身份查询; import java.awt.Dimension; import java.awt.EventQueue; import java.awt.Toolkit; import javax.swing.JFrame; public class Out { public static void main (String args[]) { Toolkit t=Toolkit.getDefaultToolkit(); Dimension s=t.getScreenSize(); EventQueue.invokeLater(() -> { JFrame frame = new Main1(); frame.setBounds(0, 0,(int)s.getWidth(),(int)s.getHeight()); frame.setTitle("身份查询系统"); frame.setDefaultCloseOperation(JFrame.EXIT_ON_CLOSE); frame.setVisible(true); }); } }
package 身份查询; public class Person implements Comparable<Person> { private String name; private String ID; private int age; private String sex; private String birthplace; public String getname() { return name; } public void setname(String name) { this.name = name; } public String getID() { return ID; } public void setID(String ID) { this.ID= ID; } public int getage() { return age; } public void setage(int age) { this.age= age; } public String getsex() { return sex; } public void setsex(String sex) { this.sex= sex; } public String getbirthplace() { return birthplace; } public void setbirthplace(String birthplace) { this.birthplace= birthplace; } public int compareTo(Person o) { return this.name.compareTo(o.getname()); } public String toString() { return name+"\t"+sex+"\t"+age+"\t"+ID+"\t"+birthplace+"\n"; } }
package 身份查询; import java.awt.BorderLayout; import java.awt.event.ActionEvent; import java.awt.event.ActionListener; import java.io.BufferedReader; import java.io.File; import java.io.FileInputStream; import java.io.FileNotFoundException; import java.io.IOException; import java.io.InputStreamReader; import java.util.*; import java.util.Timer; import javax.swing.*; public class Main1 extends JFrame { private static ArrayList<Person> Personlist; Scanner scanner = new Scanner(System.in); File file = new File("F:\\身份证号.txt"); private JPanel Panel; private JLabel JLabel1; private JButton Button,Button2,Button3; private JTextArea text,text1,text2,text3; boolean tru=true; public Main1() { Panel = new JPanel();Panel.setLayout(null); Button = new JButton("1:按姓名字典序输出人员信息"); Button2 = new JButton("2:查询最大年龄与最小年龄人员信息"); Button3 = new JButton("查询相近年龄"); JLabel1 = new JLabel("输入身份证号或者地址查询");JLabel1.setBounds(900, 50, 400, 30); text=new JTextArea(30,80);text.setBounds(50, 180, 700, 700); text1=new JTextArea(1,30);text1.setBounds(900, 80, 400, 30); text2=new JTextArea(30,80);text2.setBounds(900,180,700, 700); text3=new JTextArea(30,80);text3.setBounds(420,100,200,40); Button.addActionListener(new Action());Button.setBounds(50,50,300,40); Button2.addActionListener(new Action1());Button2.setBounds(50,100,300,40); Button3.addActionListener(new Action2());Button3.setBounds(650,100,120,40); Panel.add(JLabel1); Panel.add(Button); Panel.add(Button2); Panel.add(Button3); Panel.add(text); Panel.add(text2); Panel.add(text1); Panel.add(text3); add(Panel); Timer timer = new Timer(); TimerTask timeTask=new TimerTask() { @Override public void run() { // TODO Auto-generated method stub text2.setText(null); String place=text1.getText().toString().trim(); for (int i = 0; i <Personlist.size(); i++) { String Str=(String)Personlist.get(i).getbirthplace(); if(Str.contains(place)&&!place.equals("")) { text2.append(Personlist.get(i).toString()); } } for (int i = 0; i <Personlist.size(); i++) { String Str=(String)Personlist.get(i).getID(); if(Str.contains(place)&&!place.equals("")) { text2.append(Personlist.get(i).toString()); } } } };timer.schedule(timeTask, 0,100); Personlist = new ArrayList<>(); 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 ID = linescanner.next(); String sex = linescanner.next(); String age = linescanner.next(); String place =linescanner.nextLine(); Person Person = new Person(); Person.setname(name); Person.setID(ID); Person.setsex(sex); int a = Integer.parseInt(age); Person.setage(a); Person.setbirthplace(place); Personlist.add(Person); } } catch (FileNotFoundException e) { System.out.println("查找不到信息"); e.printStackTrace(); } catch (IOException e) { System.out.println("信息读取有误"); e.printStackTrace(); } } private class Action implements ActionListener { public void actionPerformed(ActionEvent event) { text.setText(null); Collections.sort(Personlist); text.append(Personlist.toString()); } } private class Action1 implements ActionListener { public void actionPerformed(ActionEvent event) { text.setText(null); int max=0,min=100;int j,k1 = 0,k2=0; for(int i=1;i<Personlist.size();i++) { j=Personlist.get(i).getage(); if(j>max) { max=j; k1=i; } if(j<min) { min=j; k2=i; } } text.append("年龄最大： "+Personlist.get(k1)+"\n"+"年龄最小： "+Personlist.get(k2)); } } private class Action2 implements ActionListener { public void actionPerformed(ActionEvent event) { text.setText(null); int a = Integer.parseInt(text3.getText().toString().trim()); int d_value=a-Personlist.get(agenear(a)).getage(); for (int i = 0; i < Personlist.size(); i++) { int p=Personlist.get(i).getage()-a; if(p==d_value||-p==d_value) text.append(Personlist.get(i).toString()); } } } public static int agenear(int age) { int j=0,min=53,d_value=0,k=0; for (int i = 0; i < Personlist.size(); i++) { d_value=Personlist.get(i).getage()-age; if(d_value<0) d_value=-d_value; if (d_value<min) { min=d_value; k=i; } } return k; } }
练习2：采用GUI界面设计以下程序，并进行部署与发布
编写一个计算器类，可以完成加、减、乘、除的操作
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；
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 计算器; import java.awt.Dimension; import java.awt.EventQueue; import java.awt.Toolkit; import javax.swing.JFrame; public class New { public static void main (String args[]) { Toolkit t=Toolkit.getDefaultToolkit(); Dimension s=t.getScreenSize(); EventQueue.invokeLater(() -> { JFrame frame = new Demo(); frame.setBounds(0, 0,(int)s.getWidth()/2,(int)s.getHeight()/2); frame.setTitle("计算器"); frame.setDefaultCloseOperation(JFrame.EXIT_ON_CLOSE); frame.setVisible(true); }); } }
package 计算器; 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 Demo extends JFrame { private String[] c=new String[10]; private String[] c1=new String[10]; 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 Demo() { 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("生成题目");Button.setBounds(50,150,150,50);Button.setFont(new Font("Courier",Font.PLAIN,20)); Button.addActionListener(new Action()); JButton Button2 = new JButton("确定答案");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<10) { 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 0: while(a<b){ b = (int) Math.round(Math.random() * 100);a = (int) Math.round(Math.random() * 100); } c[i]=(i+":"+a+"/"+b+"="); list[i]=Math.floorDiv(a, b); text.setText(i+":"+a+"/"+b+"="); i++; break; case 1: c[i]=(i+":"+a+"*"+b+"="); list[i]=Math.multiplyExact(a, b); text.setText(i+":"+a+"*"+b+"="); i++; break; case 2: c[i]=(i+":"+a+"+"+b+"="); list[i]=Math.addExact(a, b); text.setText(i+":"+a+"+"+b+"="); i++; break ; case 3: while(a<=b){ b = (int) Math.round(Math.random() * 100);a = (int) Math.round(Math.random() * 100); } c[i]=(i+":"+a+"-"+b+"="); text.setText(i+":"+a+"-"+b+"="); list[i]=Math.subtractExact(a, b);i++; break ; } } } } private class Action1 implements ActionListener { public void actionPerformed(ActionEvent event) { if(i<10) { text.setText(null); 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) { // TODO Auto-generated catch block e.printStackTrace(); } for(int counter=0;counter<10;counter++) { out.println(c[counter]+c1[counter]); } out.println("成绩"+sum); out.close(); } } }
实验总结：本周学习了JAR文件及创建和执行等等，通过老师讲解JAR和书上内容的学习更好地了解掌握JAR，然而本周的实验作业有难度，在编程写代码时还是存在困难与问题，只有多看代码多解释代码的练习才可以。
