请帮忙。这段代码不起作用。创建进度条，其中显示0％全部。我不太了解java.i正在寻求帮助。
原始代码：
jProgressBar1.setName("");
jProgressBar1.setValue(0);
jProgressBar1.setStringPainted(true);
jProgressBar1.addContainerListener(new java.awt.event.ContainerAdapter() {
public void componentAdded(java.awt.event.ContainerEvent evt) {
jProgressBar1ComponentAdded(evt);
}
});
private void jProgressBar1ComponentAdded(java.awt.event.ContainerEvent evt) {
Task tk = new Task();
tk.run();
}
class Task extends Thread {
public Task(){}
public void run(){
for(int i =0; i<= 100; i++){
final int progress = i;
SwingUtilities.invokeLater(new Runnable() {
public void run() {
jProgressBar1.setValue(progress);
}
});
}}}
最新代码：
import java.awt.event.ContainerAdapter;
import java.awt.event.ContainerEvent;
import javax.swing.*;
public class ini extends JFrame {
public ini() {
initComponents();
}
private void initComponents() {
setResizable(false);
jLabel1 = new JLabel();
jProgressBar1 = new JProgressBar(0,100);
jProgressBar1.addContainerListener(new ContainerAdapter() {
@Override
public void componentAdded(ContainerEvent e) {
if (jProgressBar1 == e.getChild()) {
System.out.println("progressBar!");
new Thread(new Task()).start();
}
}
});
setDefaultCloseOperation(javax.swing.WindowConstants.EXIT_ON_CLOSE);
setTitle("Criminal Records");
jLabel1.setFont(new java.awt.Font("Tahoma", 1, 24)); // NOI18N
jLabel1.setText("Criminal Records");
jProgressBar1.setName("");
jProgressBar1.setValue(0);
jProgressBar1.setStringPainted(true);
javax.swing.GroupLayout layout = new javax.swing.GroupLayout(getContentPane());
getContentPane().setLayout(layout);
layout.setHorizontalGroup(
layout.createParallelGroup(javax.swing.GroupLayout.Alignment.LEADING)
.addGroup(layout.createSequentialGroup()
.addGroup(layout.createParallelGroup(javax.swing.GroupLayout.Alignment.LEADING)
.addGroup(layout.createSequentialGroup()
.addGap(204, 204, 204)
.addComponent(jLabel1, javax.swing.GroupLayout.PREFERRED_SIZE, 254, javax.swing.GroupLayout.PREFERRED_SIZE))
.addGroup(layout.createSequentialGroup()
.addGap(215, 215, 215)
.addComponent(jProgressBar1, javax.swing.GroupLayout.PREFERRED_SIZE, 176, javax.swing.GroupLayout.PREFERRED_SIZE)))
.addContainerGap(242, Short.MAX_VALUE))
);
layout.setVerticalGroup(
layout.createParallelGroup(javax.swing.GroupLayout.Alignment.LEADING)
.addGroup(layout.createSequentialGroup()
.addGap(312, 312, 312)
.addComponent(jLabel1, javax.swing.GroupLayout.PREFERRED_SIZE, 58, javax.swing.GroupLayout.PREFERRED_SIZE)
.addGap(18, 18, 18)
.addComponent(jProgressBar1, javax.swing.GroupLayout.PREFERRED_SIZE, javax.swing.GroupLayout.DEFAULT_SIZE, javax.swing.GroupLayout.PREFERRED_SIZE)
.addContainerGap(348, Short.MAX_VALUE))
);
pack();
}
public static void main(String args[]) {
try {
for (javax.swing.UIManager.LookAndFeelInfo info : javax.swing.UIManager.getInstalledLookAndFeels()) {
if ("Nimbus".equals(info.getName())) {
javax.swing.UIManager.setLookAndFeel(info.getClassName());
break;
}
}
} catch (ClassNotFoundException ex) {
java.util.logging.Logger.getLogger(ini.class.getName()).log(java.util.logging.Level.SEVERE, null, ex);
} catch (InstantiationException ex) {
java.util.logging.Logger.getLogger(ini.class.getName()).log(java.util.logging.Level.SEVERE, null, ex);
} catch (IllegalAccessException ex) {
java.util.logging.Logger.getLogger(ini.class.getName()).log(java.util.logging.Level.SEVERE, null, ex);
} catch (javax.swing.UnsupportedLookAndFeelException ex) {
java.util.logging.Logger.getLogger(ini.class.getName()).log(java.util.logging.Level.SEVERE, null, ex);
}
java.awt.EventQueue.invokeLater(new Runnable() {
public void run() {
new ini().setVisible(true);
}
});
}
private class Task implements Runnable {
private static final long SLEEP_TIME = 100;
@Override
public void run() {
for (int i = 0; i <= 100; i++) {
final int progress = i;
SwingUtilities.invokeLater(new Runnable() {
public void run() {
jProgressBar1.setValue(progress);
}
});
try {
Thread.sleep(SLEEP_TIME);
} catch (InterruptedException e) {
e.printStackTrace();
}
}
}
}
private javax.swing.JLabel jLabel1;
private javax.swing.JProgressBar jProgressBar1;
}
答案 0 :(得分：1)
我发现使用线程有一个主要问题和一个小问题：
.start()，而不是.run()，因为后者将保证不会创建后台主题。关于您使用ContainerListener的其他问题，我等待您澄清问题，并创建并发布minimal code example program以供我们审核，测试和修复。
修改
根据你的评论，
我想在一个显示0-100％的框架中显示进度条。我创建了框架并添加了进度条。但它只显示0％，而不是移动。
同样，您有一些需要修复的线程问题。你还想在那里放一个Thread.sleep来减慢你的for循环。否则，即使使用正确的线程，您也不会看到进展。
我想在将progressbar添加到框架时调用该函数。
您正在向不会起作用的JProgressBar添加ContainerListener，因为您没有在进度条中添加任何内容。您需要将侦听器添加到保持进度条的容器中。但即便如此，这可能不是启动这一过程的好方法。但让我看看我能做些什么......请等一下。
如，
import java.awt.event.ContainerAdapter;
import java.awt.event.ContainerEvent;
import javax.swing.*;
public class JProgressExample extends JPanel {
private JProgressBar jProgressBar1 = new JProgressBar(0, 100);
public JProgressExample() {
addContainerListener(new ContainerAdapter() {
@Override
public void componentAdded(ContainerEvent e) {
if (jProgressBar1 == e.getChild()) {
System.out.println("progressBar!");
new Thread(new Task()).start();
}
}
});
jProgressBar1.setName("");
jProgressBar1.setValue(0);
jProgressBar1.setStringPainted(true);
add(jProgressBar1);
}
private class Task implements Runnable {
private static final long SLEEP_TIME = 100;
@Override
public void run() {
for (int i = 0; i <= 100; i++) {
final int progress = i;
SwingUtilities.invokeLater(new Runnable() {
public void run() {
jProgressBar1.setValue(progress);
}
});
try {
Thread.sleep(SLEEP_TIME);
} catch (InterruptedException e) {
e.printStackTrace();
}
}
}
}
private static void createAndShowGui() {
JProgressExample mainPanel = new JProgressExample();
JFrame frame = new JFrame("JProgressExample");
frame.setDefaultCloseOperation(JFrame.DISPOSE_ON_CLOSE);
frame.getContentPane().add(mainPanel);
frame.pack();
frame.setLocationByPlatform(true);
frame.setVisible(true);
}
public static void main(String[] args) {
SwingUtilities.invokeLater(new Runnable() {
public void run() {
createAndShowGui();
}
});
}
}