Java JFrame在更改背景颜色时闪烁

我正在制作一个每750毫秒改变背景颜色的窗口。。。但是

JFrame

像这样闪烁

我想要这样的

我找到了如下解决方案：

1.-Frame.getContentPane（）.setBackground（颜色）
2.-制作一条新线
3.-Frame.getContentPane（）.repaint（）

但它不起作用

我的代码

Thread ciclo=新线程（new Runnable（））{

我怎样才能解决这个问题？

---

感谢您的建议

您试图在后台线程中更改Swing状态，这违反了Swing线程规则。请使用Swing计时器，因为这可能会解决您的问题

new Timer(750, new ActionListener() {
  public void actionPerformed(ActionEvent e) {
    contentPane.setBackground((Color.getHSBColor((c/360), 1, 1));
    contentPane.repaint();
    c= (c >= 360) ? 1 : c + 5;
  }
}).start();

---

编辑或更好：

import java.awt.Color;
import java.awt.Dimension;
import java.awt.event.ActionEvent;
import java.awt.event.ActionListener;

import javax.swing.*;

@SuppressWarnings("serial")
public class BackgroundColorChange extends JPanel {
   private static final int PREF_W = 400;
   private static final int PREF_H = PREF_W;
   private static final int TIMER_DELAY = 75;

   public BackgroundColorChange() {
      new Timer(TIMER_DELAY, new ActionListener() {
         private int c = 1;

         @Override
         public void actionPerformed(ActionEvent arg0) {
            setBackground(Color.getHSBColor((float) c / 360, 1f, 1f));
            repaint();
            c = (c >= 360) ? 1 : c + 5;
         }
      }).start();
   }

   @Override
   public Dimension getPreferredSize() {
      return new Dimension(PREF_W, PREF_H);
   }

   private static void createAndShowGui() {
      BackgroundColorChange mainPanel = new BackgroundColorChange();

      JFrame frame = new JFrame("BackgroundColorChange");
      frame.setDefaultCloseOperation(JFrame.EXIT_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();
         }
      });
   }
}

import java.awt.Color;
import java.awt.Dimension;
import java.awt.event.ActionEvent;
import java.awt.event.ActionListener;

import javax.swing.*;

@SuppressWarnings("serial")
public class BackgroundColorChange extends JPanel {
   private static final int PREF_W = 400;
   private static final int PREF_H = PREF_W;
   private static final int TIMER_DELAY = 75;

   public BackgroundColorChange() {
      new Timer(TIMER_DELAY, new ActionListener() {
         private int c = 1;

         @Override
         public void actionPerformed(ActionEvent arg0) {
            setBackground(Color.getHSBColor((float) c / 360, 1f, 1f));
            repaint();
            c = (c >= 360) ? 1 : c + 5;
         }
      }).start();
   }

   @Override
   public Dimension getPreferredSize() {
      return new Dimension(PREF_W, PREF_H);
   }

   private static void createAndShowGui() {
      BackgroundColorChange mainPanel = new BackgroundColorChange();

      JFrame frame = new JFrame("BackgroundColorChange");
      frame.setDefaultCloseOperation(JFrame.EXIT_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();
         }
      });
   }
}