我有一个主类扩展了一个JFrame，然后JFrame添加一个jpanel。然后我尝试设置jpanel的背景颜色，但无济于事。根据我在google上发现的情况，我不确定问题出在哪里，只需在JPanel中设置setBackground(Color)即可解决此问题，但似乎无法解决问题。此外，其他修补程序为setOpaque(true)和setVisible(true)，或者使用getContentPane().setBackground(Color)形成JFrame但这些都不起作用。任何建议将非常感激，如果您需要更多信息，或有其他建议，请随时为我提供启发。 :) 主类是：Java Jpanel，无法设置背景颜色

public class main extends JFrame{

private Content content;

public main(){

content = new Content(400, 600);

this.setTitle("Shooter2.0");

this.setDefaultCloseOperation(JFrame.EXIT_ON_CLOSE);

this.setResizable(false);

this.getContentPane().add(content);

this.getContentPane().setBackground(Color.BLACK);

this.pack();

this.setVisible(true);

try{

Thread.sleep(10000);

}catch(Exception e){}

}

public static void main(String[] args){

main game = new main();

}

}

和内容类：

public class Content extends JPanel{

private viewItem ship;

public Content(int w, int h){

this.setPreferredSize(new Dimension(w, h));

this.setLayout(new BorderLayout());

this.createBattlefield();

this.setOpaque(true);

this.setBackground(Color.BLACK);

this.repaint();

this.setVisible(true);

}

public void createBattlefield(){

ship = new viewItem("bubble-field.png", 180, 550, 40, 42);

}

public void paint(Graphics g){

g.setColor(Color.BLACK);

this.setBackground(Color.BLACK);

ship.draw(g);

}

}

I am working on a "paint-like" application (a little drawing software) to familiarize with Java 2D components. Here is my problem: I have a JFrame whose ContentPane is an instance of a class inheriting from JPanel. I want to set the background color to white but it remains on its default color... The class name corresponding to ContentPane is Container. Here is a simplified code:

public class Container extends JPanel {

public Container() {

super();

this.setBackground(Color.WHITE);

}

}

The JFrame constructor contains the line:

this.setContentPane(mainContainer);

Have I missed something?

Thx.

解决方案

This could fix it...

public class Container extends JPanel

{

public Container()

{

super();

this.setOpaque(true);

this.setBackground(Color.WHITE);

}

}

package com.chcbz;

import javax.swing.JFrame;

import javax.swing.JPanel;

import java.awt.BasicStroke;

import java.awt.Color;

import java.awt.Container;

import java.awt.Graphics2D;

import java.awt.Graphics;

public class Chart {

public static void main(String[] args){

JFrame jf = new JFrame("Test");

Wall w = new Wall();

Container contentPane = jf.getContentPane();

contentPane.add("Center",w);

jf.setSize(100,100);

jf.setDefaultCloseOperation(JFrame.EXIT_ON_CLOSE);

jf.setVisible(true);

}

}

class Wall extends JPanel{

public void paint(Graphics g){

Graphics2D g2d = (Graphics2D)g;

setBackground(Color.blue);

g2d.setColor(Color.red);

g2d.setStroke(new BasicStroke(4f,0,0));

g2d.drawRect(10, 10, 50, 50);

g2d.drawLine(10, 40, 60, 40);

g2d.drawLine(35, 10, 35, 40);

}

}

我是想将JPanel背景颜色改成黑色，而不是在JFrame设,为什么显示不了背景颜色啊？请各位高手赐教.

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jingtao8177

jingtao8177

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#1 得分：30 回复于： 2007-08-07 19:39:28

改下你那个Wall类

class Wall extends JPanel{

public void paintBorder(Graphics g){

Graphics2D g2d = (Graphics2D)g;

setBackground(Color.blue);

g2d.setColor(Color.red);

g2d.setStroke(new BasicStroke(4f,0,0));

g2d.drawRect(10, 10, 50, 50);

g2d.drawLine(10, 40, 60, 40);

g2d.drawLine(35, 10, 35, 40);

}

}