How to change JFrame background color in Java

At first, create a JFrame −

JFrame frame = new JFrame();
frame.setDefaultCloseOperation(JFrame.EXIT_ON_CLOSE);
frame.setPreferredSize(new Dimension(550, 300));

Now, change the background color of the JFrame −

frame.getContentPane().setBackground(Color.BLUE);

The following is an example to change JFrame background color −

Example

import java.awt.Color;
import java.awt.Dimension;
import javax.swing.JFrame;
public class SwingDemo {
   public static void main(String[] args) {
      JFrame frame = new JFrame();
      frame.setDefaultCloseOperation(JFrame.EXIT_ON_CLOSE);
      frame.setPreferredSize(new Dimension(550, 300));
      frame.getContentPane().setBackground(Color.BLUE);
      frame.pack();
      frame.setVisible(true);
   }
}

Output