[英]Why won't the background of my JFrame become black?
I'm working on a school project and I'm having trouble changing the background colour.我正在做一个学校项目,但无法更改背景颜色。 For some reason it keeps showing up as the default grey colour instead of black.
由于某种原因,它一直显示为默认的灰色而不是黑色。
import javax.swing.*;
import java.awt.*;
import java.awt.geom.*;
import java.awt.image.*;
import java.awt.event.*;
import java.util.*;
import java.lang.Class;
import java.lang.reflect.*;
//creates PoolTable claa
public class PoolTable extends JPanel implements Runnable, KeyListener, MouseListener, MouseMotionListener
{
//creates size of the play screen.
public JFrame myFrame = new JFrame("Pool!");
private JPanel panel = new JPanel();
private int gameWidth;
private int gameHeight;
public PoolTable()
{
int width = 750;
int height = 500;
myFrame.setTitle("Pool");
myFrame.getContentPane().setBackground(Color.BLACK);
myFrame.setSize(width, height);
myFrame.setResizable(false);
myFrame.setDefaultCloseOperation(JFrame.EXIT_ON_CLOSE);
myFrame.setContentPane(this);
myFrame.setVisible(true);
}
}
You are replacing default content pane with yours one.您正在用您的替换默认内容窗格。 so change background color after replacing content pane.
所以更换内容窗格后更改背景颜色。
myFrame.setContentPane(this);
myFrame.getContentPane().setBackground(Color.BLACK);
OR do或者做
this.setBackground(Color.BLACK);
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