JAVA多线程程序ProgressBar
题目简介：
思维导图：
实验代码：建议先看CalThread类，计算线程的实现，再作基本CalFrame类的界面，
然后作ReadThread类，结合CalFrame的组件，最后完善CalFrame类
（代码折叠）
import java.awt.EventQueue;import javax.swing.JFrame; import java.awt.BorderLayout; import javax.swing.JLabel; import java.awt.Font; import javax.swing.SwingConstants; import javax.swing.JPanel; import java.awt.GridLayout; import javax.swing.JTextArea; import javax.swing.JProgressBar; import javax.swing.border.EmptyBorder; import javax.swing.JButton; import java.awt.event.ActionListener; import java.awt.event.ActionEvent; /***@author 李祖林*/ public class CalFrame implements ActionListener{private JFrame frame;JTextArea textA,textB;JProgressBar progressBar;JButton button;public CalFrame() {frame = new JFrame();frame.setBounds(100, 100, 755, 300);frame.setDefaultCloseOperation(JFrame.EXIT_ON_CLOSE);frame.getContentPane().setLayout(new BorderLayout(0, 0));JLabel label = new JLabel("\u591A\u7EBF\u7A0B \u8BA1\u7B971!+2!+...+12!");label.setHorizontalAlignment(SwingConstants.CENTER);label.setFont(new Font("宋体", Font.BOLD, 18));frame.getContentPane().add(label, BorderLayout.NORTH);JPanel panel = new JPanel();frame.getContentPane().add(panel, BorderLayout.CENTER);panel.setLayout(new GridLayout(3, 2, 0, 0));JLabel label_1 = new JLabel("\u8BA1\u7B97\u8FC7\u7A0B");label_1.setFont(new Font("宋体", Font.BOLD, 18));label_1.setHorizontalAlignment(SwingConstants.CENTER);panel.add(label_1);textA = new JTextArea();textA.setFont(new Font("Courier New", Font.BOLD, 15));panel.add(textA);JLabel label_2 = new JLabel("\u8FDB\u5EA6\u6761");label_2.setHorizontalAlignment(SwingConstants.CENTER);label_2.setFont(new Font("宋体", Font.BOLD, 18));panel.add(label_2);progressBar = new JProgressBar();progressBar.setMaximum(12);panel.add(progressBar);JLabel label_3 = new JLabel("\u8BA1\u7B97\u7ED3\u679C");label_3.setHorizontalAlignment(SwingConstants.CENTER);label_3.setFont(new Font("宋体", Font.BOLD, 18));panel.add(label_3);textB = new JTextArea();textB.setFont(new Font("Courier New", Font.BOLD, 18));panel.add(textB);JPanel panel_1 = new JPanel();frame.getContentPane().add(panel_1, BorderLayout.SOUTH);button = new JButton("\u5F00\u59CB");button.setFont(new Font("宋体", Font.BOLD, 18));panel_1.add(button);button.addActionListener(this);frame.setVisible(true);}public void actionPerformed(ActionEvent e) {/*计算线程 自启动*/CalThread calThread = new CalThread();/*读取线程*/ReadThread readThread = new ReadThread(this); //此处的this是CalFrame类的对象Thread thread = new Thread(readThread); //非自启动：构造扩展线程类的对象，通过Thread()传该类得以实现线程 thread.start();}public static void main(String[] args) {CalFrame calFrame = new CalFrame();}}
/*** @author 李祖林**/ public class ReadThread extends Thread {/*成员变量*/CalFrame calFrame;/*（有参与无参）构造函数*/public ReadThread() {}public ReadThread(CalFrame calFrame) {this.calFrame = calFrame;}/*线程开始读取*/public void run(){while(true){calFrame.textA.setText(CalThread.string); //计算过程calFrame.textB.setText(String.valueOf(CalThread.sum)); //计算结果calFrame.progressBar.setValue(CalThread.n); //计算进度try {Thread.sleep(100);} catch (InterruptedException e) { System.err.println("读取线程ReadThread发送错误！");e.printStackTrace();}}} }
/*** @author 李祖林**/ public class CalThread extends Thread {static double sum = 1; static String string = "1!";static int n = 1;Thread thread = null;/*构造函数 自启动*/public CalThread() {thread = new Thread(this);thread.start();}/*计算n!*/double fun(int n){double sum = 1;for(int i = 1;i <= n;i++){sum *= i;}return sum;}/*线程开始计算*/public void run(){while(n<12){n++; //进度条进度sum += fun(n); //计算结果string = string + "+" + n + "!"; //计算过程try {Thread.sleep((int)Math.random()*600 + 300); //随机300-900毫秒} catch (InterruptedException e) {System.err.println("计算线程CalThread出现错误！");e.printStackTrace();}}}}
实验结果：
