設置背景顏色[JAVA]

Question

我處於應用程序的中間，背景看起來很平坦。 我已經嘗試設置使用我的知識的代碼，僅僅是這一個背景：

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

全：

JFrame frame = new JFrame("HC Navigator"); 
    frame.setVisible(true); 
    frame.setSize(250, 200); 
    frame.getContentPane().setBackground(Color.BLUE); // Colour Set Here 
    frame.setDefaultCloseOperation(JFrame.EXIT_ON_CLOSE); 

現在，當我啓動，它打開了一個藍色的背景，但隨後的窗口一旦它加載按鈕/ Jpanels，背景將回到純白色。

主面板/ JFrame的代碼：

package me.jamplifier; 

import java.awt.BorderLayout; 
import java.awt.Color; 
import java.awt.EventQueue; 
import java.awt.FlowLayout; 
import java.awt.Font; 
import java.awt.Image; 
import java.awt.Toolkit; 
import java.awt.event.ActionEvent; 
import java.awt.event.ActionListener; 
import java.awt.image.BufferedImage; 
import java.io.IOException; 
import java.io.InputStream; 
import java.util.ArrayList; 
import java.util.List; 

import javax.imageio.ImageIO; 
import javax.swing.BoxLayout; 
import javax.swing.JButton; 
import javax.swing.JFrame; 
import javax.swing.JLabel; 
import javax.swing.JPanel; 
import javax.swing.JScrollPane; 
import javax.swing.JTextArea; 
import javax.swing.JTextField; 
import javax.swing.ScrollPaneConstants; 
import javax.swing.UIManager; 
import javax.swing.UnsupportedLookAndFeelException; 
import javax.swing.text.DefaultCaret; 

public class Launcher extends JFrame { 



    // Main Class Area (Default/Main Windows) 
     public Launcher(){ 

     // Main Window 
     JFrame frame = new JFrame("HC Navigator"); 
     frame.setSize(250, 200); 
     frame.setDefaultCloseOperation(JFrame.EXIT_ON_CLOSE); 
     frame.setVisible(true); 
     // Text Labels 
     JLabel label = new JLabel("Beta 1.5  "); 
     JLabel label1 = new JLabel("Welcome to HurricaneCraft"); 
     JPanel panel = new JPanel(); 
     frame.add(panel); 
     panel.add(label); 
     panel.add(label1); 

     Font font = new Font("Verdana", Font.BOLD, 12); 
     label1.setFont(font); 
     label1.setForeground(Color.RED); 
     label.setFont(font); 
     label.setForeground(Color.GRAY); 

     // Buttons 
     JButton site = new JButton("Site"); 
     site.addActionListener(new ActionListener() 
     { 
      public void actionPerformed(ActionEvent e) 
      { 
       openWebPage("http://www.hurricanecraft.com"); 
      } 
     }); 

     JButton forums = new JButton("Forums"); 
     forums.addActionListener(new ActionListener() 
     { 
      public void actionPerformed(ActionEvent e) 
      { 
       openWebPage("http://www.hurricanecraft.com/forums/"); 
      } 
     }); 
     JButton apps = new JButton("Member Apps"); 
     apps.addActionListener(new ActionListener() 
     { 
      public void actionPerformed(ActionEvent e) 
      { 
       openWebPage("http://hurricanecraft.freeforums.org/member-registration-f29.html"); 
      } 
     }); 
     JButton community = new JButton("Community"); 
     community.addActionListener(new ActionListener() 
     { 
      public void actionPerformed(ActionEvent e) 
      { 
       createFrame2(); 
      } 
     }); 
     JButton admin = new JButton("Admin Area"); 
     admin.addActionListener(new ActionListener() 
     { 
      public void actionPerformed(ActionEvent e) 
      { 
       createFrame(); 
      } 
     }); 
     JButton update = new JButton("Update Log"); 
     update.addActionListener(new ActionListener() 
     { 
      public void actionPerformed(ActionEvent e) 
      { 
       createFrame1(); 
      } 
     }); 
     panel.add(site); 
     panel.add(forums); 
     panel.add(community); 
     panel.add(apps); 
     panel.add(admin); 
     panel.add(update); 


    } 

Answer 1

當您將面板添加到JFrame它佔據所有視圖。不要更改JFrame ContentPane的顏色，而是嘗試更改面板的背景顏色。