如何將JPanel添加到JFrame中

Question

我想知道添加覆蓋整個JFrame的JPanel的正確語法。

這裏是我迄今編寫的代碼：欲瞭解更多信息請閱讀Swing tutorial

package frame; 

import javax.swing.JFrame; 

public class Frame { 

public static void main(String[] args) { 
    JFrame Frame = new JFrame("My Window"); 
    Frame.setDefaultCloseOperation(JFrame.EXIT_ON_CLOSE); 
    Frame.setVisible(true); 
    Frame.setSize(320, 240); 
    Frame.setResizable(false); 
    Frame.setLocationRelativeTo(null); 
    //Thanks in advance 
} 

}

Answer 1

JPanel myPanel = new JPanel(); 
    myPanel.setBackground(Color.GREEN); 
    JFrame jf = new JFrame("My window"); 
    jf.setVisible(true); 

    jf.getContentPane().add(myPanel); 

。

Answer 2

package frame; 

import javax.swing.JFrame; 

public class Frame { 

public static void main(String[] args) { 
JFrame Frame = new JFrame("My Window"); 
Frame.setDefaultCloseOperation(JFrame.EXIT_ON_CLOSE); 
Frame.setSize(320, 240); 
Frame.setResizable(false); 
Frame.setLocationRelativeTo(null); 
JPanel panel = new JPanel(); 
frame.add(panel); 
frame.setVisible(true); 
panel.setVisible(true); 
}