在 JFrame 中使用 Java 计时器
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Using java timer in JFrame
提问by Ahmet Emin Pehlivan
when handset button pressed I want to green button color change red.After a certain time,again I want to green button.I dont use timer class.Please help me.
当手机按钮按下时我想绿色按钮颜色变成红色。一段时间后，我又想绿色按钮。我不使用计时器类。请帮助我。
For example my code
例如我的代码
if (e.getSource() == handsetbutton) {
text1.setBackground(Color.RED);
// What l have to add here?
}
采纳答案by Paul Samsotha
Run this example. I use a Swing Timer and set the delay to 4 seconds. When the button is pressed, it fires an action to change the color and start the timer. When the 4 seconds is up, the color changes back
运行这个例子。我使用 Swing Timer 并将延迟设置为 4 秒。当按钮被按下时，它会触发一个动作来改变颜色并启动计时器。当 4 秒到时，颜色变回
import java.awt.BorderLayout;
import java.awt.Color;
import java.awt.Dimension;
import java.awt.Graphics;
import java.awt.event.ActionEvent;
import java.awt.event.ActionListener;
import javax.swing.JButton;
import javax.swing.JFrame;
import javax.swing.JPanel;
import javax.swing.SwingUtilities;
import javax.swing.Timer;
public class GreenToRed extends JPanel {
private Color color = Color.RED; // global color object
static JButton button = new JButton("Change");
private Timer timer = null;
public GreenToRed(){
timer = new Timer(4000, new ActionListener(){ // Timer 4 seconds
public void actionPerformed(ActionEvent e) {
color = Color.RED; // after 4 seconds change back to red
repaint();
}
});
button.addActionListener(new ActionListener(){
public void actionPerformed(ActionEvent e) {
color = Color.GREEN; // change to green
repaint(); // repaint
timer.start(); // start timer
}
});
}
private static void createAndShowGui() {
JFrame frame = new JFrame();
frame.add(new GreenToRed(), BorderLayout.CENTER);
frame.add(button, BorderLayout.SOUTH);
frame.setDefaultCloseOperation(JFrame.EXIT_ON_CLOSE);
frame.pack();
frame.setVisible(true);
}
protected void paintComponent(Graphics g) {
super.paintComponent(g);
g.setColor(color);
g.fillOval(getWidth() / 2 - 50, getHeight() / 2 - 50, 100, 100);
}
public Dimension getPreferredSize() {
return new Dimension(300, 300);
}
public static void main(String[] args) {
SwingUtilities.invokeLater(new Runnable() {
public void run() {
createAndShowGui();
}
});
}
}
