java实现不确定进度条_Swing显示不确定的进度条

下面的示例展示如何在Java Swing应用程序中显示不确定的进度条。

使用以下API -

JProgressBar - 创建进度条字段。

JProgressBar.setIndeterminate - 在不确定模式下设置进度条。

JProgressBar.setValue - 设置进度条中的进度。

示例

package com.yiibai.swingdemo;

import java.awt.*;

import java.awt.event.*;

import javax.swing.*;

public class SwingTester {

private JFrame mainFrame;

private JLabel headerLabel;

private JLabel statusLabel;

private JPanel controlPanel;

public SwingTester(){

prepareGUI();

}

public static void main(String[] args){

SwingTester swingControlDemo &＃61; new SwingTester();

swingControlDemo.showProgressBarDemo();

}

private void prepareGUI(){

mainFrame &＃61; new JFrame("Swing显示不确定的进度条");

mainFrame.setSize(420,420);

mainFrame.setLayout(new GridLayout(3, 1));

mainFrame.addWindowListener(new WindowAdapter() {

public void windowClosing(WindowEvent windowEvent){

System.exit(0);

}

});

headerLabel &＃61; new JLabel("", JLabel.CENTER);

statusLabel &＃61; new JLabel("",JLabel.CENTER);

statusLabel.setSize(350,100);

controlPanel &＃61; new JPanel();

controlPanel.setLayout(new FlowLayout());

mainFrame.add(headerLabel);

mainFrame.add(controlPanel);

mainFrame.add(statusLabel);

mainFrame.setVisible(true);

}

private JProgressBar progressBar;

private Task task;

private JButton startButton;

private JTextArea outputTextArea;

private void showProgressBarDemo(){

headerLabel.setText("Control in action: JProgressBar");

progressBar &＃61; new JProgressBar(0, 100);

progressBar.setIndeterminate(true);

progressBar.setValue(0);

progressBar.setStringPainted(true);

startButton &＃61; new JButton("开始~");

outputTextArea &＃61; new JTextArea("",5,20);

JScrollPane scrollPane &＃61; new JScrollPane(outputTextArea);

startButton.addActionListener(new ActionListener() {

&＃64;Override

public void actionPerformed(ActionEvent e) {

task &＃61; new Task();

task.start();

}

});

controlPanel.add(startButton);

controlPanel.add(progressBar);

controlPanel.add(scrollPane);

mainFrame.setVisible(true);

}

private class Task extends Thread {

public Task(){

}

public void run(){

for(int i &＃61;0; i<&＃61; 100; i&＃43;&＃61;10){

final int progress &＃61; i;

SwingUtilities.invokeLater(new Runnable() {

public void run() {

progressBar.setIndeterminate(false);

progressBar.setValue(progress);

outputTextArea.setText(outputTextArea.getText()

&＃43; String.format("已完成 %d%% .\n", progress));

}

});

try {

Thread.sleep(100);

} catch (InterruptedException e) {}

}

}

}

}

执行上面示例代码&＃xff0c;得到以下结果&＃xff1a;

¥ 我要打赏

纠错/补充

收藏

加QQ群啦&＃xff0c;易百教程官方技术学习群

注意&＃xff1a;建议每个人选自己的技术方向加群&＃xff0c;同一个QQ最多限加 3 个群。