好的,所以我制作了一个简单的程序,每次单击按钮时都会添加要计数器的值。
现在,我想添加“自动”按钮功能,以在单击“自动”按钮时增加计数器的值。我遇到了问题,因为它不会在屏幕上呈现每个计数器值,而是在循环完成时更新值。这是我的代码:
import java.awt.FlowLayout;
import java.awt.event.ActionEvent;
import java.awt.event.ActionListener;
import java.util.concurrent.TimeUnit;
import javax.swing.JButton;
import javax.swing.JFrame;
public class Gui extends JFrame{
private static final long serialVersionUID = 1L;
private JButton uselesButton;
private JButton autoButton;
private FlowLayout layout;
private long counter = 0;
public Gui() {
super("Button");
layout = new FlowLayout(FlowLayout.CENTER);
this.setLayout(layout);
uselesButton = new JButton(String.format("Pressed %d times", counter));
add(uselesButton);
uselesButton.addActionListener(new ActionListener() {
@Override
public void actionPerformed(ActionEvent e) {
counter++;
uselesButton.setText(String.format("Pressed %d times", counter));
}
});
autoButton = new JButton("Auto");
add(autoButton);
autoButton.addActionListener(new ActionListener() {
@Override
public void actionPerformed(ActionEvent e) {
for(long i =0; i < 99999999;i++) {
try {
TimeUnit.MILLISECONDS.sleep(10);
} catch (InterruptedException e1) {
System.out.println("ERROR");
}
counter = i;
uselesButton.setText(String.format("Pressed %d times", counter));
}
}
});
}
}
请记住,我是初学者......感谢所有帮助:)
看看关于如何使用的教程摇摆计时器 http://docs.oracle.com/javase/tutorial/uiswing/misc/timer.html然后看看我的解决方案:
import java.awt.FlowLayout;
import java.awt.event.ActionEvent;
import java.awt.event.ActionListener;
import javax.swing.JButton;
import javax.swing.JFrame;
public class Gui extends JFrame {
private static final long serialVersionUID = 1L;
private JButton uselesButton;
private JButton autoButton;
private FlowLayout layout;
private long counter = 0;
private javax.swing.Timer timer;
public Gui() {
super("Button");
layout = new FlowLayout(FlowLayout.CENTER);
setLayout(layout);
setDefaultCloseOperation(3);
setSize(300, 300);
setLocationRelativeTo(null);
//initialing swing timer
timer = new javax.swing.Timer(100, getButtonAction());
autoButton = new JButton("Auto");
add(autoButton);
autoButton.addActionListener(new ActionListener() {
@Override
public void actionPerformed(ActionEvent e) {
if (!timer.isRunning()) {
timer.start();
} else {
timer.stop();
}
}
});
}
private ActionListener getButtonAction() {
ActionListener action = new ActionListener() {
@Override
public void actionPerformed(ActionEvent e) {
autoButton.setText(String.format("Pressed %d times", ++counter));
if (counter > 1000) {
timer.stop();
}
}
};
return action;
}
public static void main(String... args) {
javax.swing.SwingUtilities.invokeLater(new Runnable() {
@Override
public void run() {
new Gui().setVisible(true);
}
});
}
}
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