Java 更改线程中的JButton颜色
我想做一个像西蒙这样的游戏: 我正在制作一个只有两个按钮的小比例。我希望颜色在两个按钮之间切换,按钮1和按钮2。这是在一个线程中,因为我需要在发生这种情况时单击按钮。当我打开程序时,按钮的颜色保持不变 提前谢谢你的帮助Java 更改线程中的JButton颜色,java,multithreading,swing,Java,Multithreading,Swing,我想做一个像西蒙这样的游戏: 我正在制作一个只有两个按钮的小比例。我希望颜色在两个按钮之间切换,按钮1和按钮2。这是在一个线程中,因为我需要在发生这种情况时单击按钮。当我打开程序时,按钮的颜色保持不变 提前谢谢你的帮助 import java.awt.BorderLayout; import java.awt.Color; import java.awt.Container; import java.awt.FlowLayout; import javax.swing.*; public c
import java.awt.BorderLayout;
import java.awt.Color;
import java.awt.Container;
import java.awt.FlowLayout;
import javax.swing.*;
public class TestFrame extends JFrame{
public JButton button1;
public JButton button2;
boolean isTrue = true;
boolean switchColor = true;
TestFrame(){
super("Simon");
initialize();
this.setSize(200, 400);
this.setVisible(true);
}
private void initialize() {
this.setLayout(new BorderLayout());
button1 = new JButton();
button1.setBackground(Color.green);
button1.setSize(200,200);
button2 = new JButton();
button2.setSize(200, 200);
button2.setBackground(Color.blue);
this.add(button1, BorderLayout.NORTH);
this.add(button2, BorderLayout.SOUTH);
Thread t = new Thread(r1);
t.start();
}
Runnable r1 = new Runnable() {
public void run() {
while(isTrue){
if(switchColor = true){
button1.setBackground(Color.blue);
button2.setBackground(Color.green);
try {
Thread.sleep(500);
} catch (InterruptedException e) {
// TODO Auto-generated catch block
e.printStackTrace();
}
refresh();
switchColor = false;
} else {
button1.setBackground(Color.green);
button2.setBackground(Color.blue);
try {
Thread.sleep(500);
} catch (InterruptedException e) {
// TODO Auto-generated catch block
e.printStackTrace();
}
refresh();
switchColor = true;
}
}
}
};
public void refresh(){
this.invalidate();
this.validate();
this.repaint();
}
}
在上述代码中,将以下内容更改为
if(switchColor = true){
到
或者只是
if(switchColor){
最好将您的可运行匿名类放在内部
SwingUtilities.invokeLater(new Runnable() {
public void run() {
}
});
而不是使用一个新的线程对象来创建和启动线程,因为它将更改Swing UI属性。有许多问题很突出(shazin已经解决了其中一个),另一个让我害怕的是您违反了Swing的单线程要求。对UI的所有更改都必须在事件调度线程的上下文中进行 不要使用
线程
,而应该使用javax.swing.Timer
。这将使您无需将更新重新同步回EDT
import java.awt.BorderLayout;
import java.awt.Color;
import java.awt.Dimension;
import java.awt.EventQueue;
import java.awt.GridBagConstraints;
import java.awt.GridBagLayout;
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.Timer;
import javax.swing.UIManager;
import javax.swing.UnsupportedLookAndFeelException;
public class FlashyButtons {
public static void main(String[] args) {
new FlashyButtons();
}
public FlashyButtons() {
EventQueue.invokeLater(new Runnable() {
@Override
public void run() {
try {
UIManager.setLookAndFeel(UIManager.getSystemLookAndFeelClassName());
} catch (ClassNotFoundException | InstantiationException | IllegalAccessException | UnsupportedLookAndFeelException ex) {
}
JFrame frame = new JFrame("Testing");
frame.setDefaultCloseOperation(JFrame.EXIT_ON_CLOSE);
frame.setLayout(new BorderLayout());
frame.add(new TestPane());
frame.pack();
frame.setLocationRelativeTo(null);
frame.setVisible(true);
}
});
}
public class TestPane extends JPanel {
private JButton btn1;
private JButton btn2;
private int count = 0;
public TestPane() {
setLayout(new GridBagLayout());
btn1 = new FlashButton();
btn2 = new FlashButton();
GridBagConstraints gbc = new GridBagConstraints();
gbc.gridwidth = GridBagConstraints.REMAINDER;
add(btn1, gbc);
add(btn2, gbc);
btn1.setBackground(Color.GREEN);
btn2.setBackground(Color.BLUE);
Timer timer = new Timer(500, new ActionListener() {
@Override
public void actionPerformed(ActionEvent e) {
count++;
if (count % 2 == 0) {
btn1.setBackground(Color.BLUE);
btn2.setBackground(Color.GREEN);
} else {
btn1.setBackground(Color.GREEN);
btn2.setBackground(Color.BLUE);
}
}
});
timer.start();
}
}
public class FlashButton extends JButton {
@Override
public Dimension getPreferredSize() {
return new Dimension(200, 200);
}
}
}
查看更多详细信息您是否还想讨论OP违反Swing的单线程要求这一事实
SwingUtilities.invokeLater(new Runnable() {
public void run() {
}
});
import java.awt.BorderLayout;
import java.awt.Color;
import java.awt.Dimension;
import java.awt.EventQueue;
import java.awt.GridBagConstraints;
import java.awt.GridBagLayout;
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.Timer;
import javax.swing.UIManager;
import javax.swing.UnsupportedLookAndFeelException;
public class FlashyButtons {
public static void main(String[] args) {
new FlashyButtons();
}
public FlashyButtons() {
EventQueue.invokeLater(new Runnable() {
@Override
public void run() {
try {
UIManager.setLookAndFeel(UIManager.getSystemLookAndFeelClassName());
} catch (ClassNotFoundException | InstantiationException | IllegalAccessException | UnsupportedLookAndFeelException ex) {
}
JFrame frame = new JFrame("Testing");
frame.setDefaultCloseOperation(JFrame.EXIT_ON_CLOSE);
frame.setLayout(new BorderLayout());
frame.add(new TestPane());
frame.pack();
frame.setLocationRelativeTo(null);
frame.setVisible(true);
}
});
}
public class TestPane extends JPanel {
private JButton btn1;
private JButton btn2;
private int count = 0;
public TestPane() {
setLayout(new GridBagLayout());
btn1 = new FlashButton();
btn2 = new FlashButton();
GridBagConstraints gbc = new GridBagConstraints();
gbc.gridwidth = GridBagConstraints.REMAINDER;
add(btn1, gbc);
add(btn2, gbc);
btn1.setBackground(Color.GREEN);
btn2.setBackground(Color.BLUE);
Timer timer = new Timer(500, new ActionListener() {
@Override
public void actionPerformed(ActionEvent e) {
count++;
if (count % 2 == 0) {
btn1.setBackground(Color.BLUE);
btn2.setBackground(Color.GREEN);
} else {
btn1.setBackground(Color.GREEN);
btn2.setBackground(Color.BLUE);
}
}
});
timer.start();
}
}
public class FlashButton extends JButton {
@Override
public Dimension getPreferredSize() {
return new Dimension(200, 200);
}
}
}