Frame.getContentPane（）。setBackground（Color.black）不

Question

I've followed the advice of countless other tutorials for changing the background color of a JFrame, but I haven't any luck. Here's my code for initializing and creating a frame

package frameTests;

import javax.swing.*;

import java.awt.*;


@SuppressWarnings("serial")
public class Foo extends JPanel {

public static void frameInit(Foo foobar){
    // window initialization
    JFrame frame = new JFrame("Spaceship Defenders!");
    frame.add(foobar);
    frame.setDefaultCloseOperation(JFrame.EXIT_ON_CLOSE);   
    frame.getContentPane().setBackground(Color.black);
    frame.setSize(500,500);
    frame.setVisible(true);
    frame.setLocationRelativeTo(null);// center frame in screen.
}




public static void main(String[] args) throws InterruptedException{

    Foo bar = new Foo();
    frameInit(bar);

    }
}

Answer 1

Your panel foobar is hiding the ContentPane . Either make the panel transparent or set the color of the panel itself to BLACK

foobar.setOpaque(false);