JPanel (GridLayout(),FlowLayout(),BorderLayout(),null)

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package jyh;import java.awt.*;import javax.swing.*;public class ComplexLayoutDemo extends JFrame{    private JPanel panel1=new JPanel();    private JPanel panel2=new JPanel();    private JPanel panel3=new JPanel();    private JPanel panel4=new JPanel();    public ComplexLayoutDemo()    {        setSize(500,500);        setLocation(400,400);        setDefaultCloseOperation(JFrame.EXIT_ON_CLOSE);        LayoutPanel1();        LayoutPanel2();        LayoutPanel3();        LayoutPanel4();        setLayout(new GridLayout(2, 2));        add(panel1);        add(panel2);        add(panel3);        add(panel4);    }    private void LayoutPanel1(){         JButton north=new JButton("北");         JButton south=new JButton("南");         JButton east=new JButton("东");         JButton west=new JButton("西");         JButton center=new JButton("中");         panel1.setLayout(new BorderLayout());         panel1.add(north, BorderLayout.NORTH);         panel1.add(south, BorderLayout.SOUTH);         panel1.add(west, BorderLayout.WEST);         panel1.add(east, BorderLayout.EAST);         panel1.add(center, BorderLayout.CENTER);    }    private void LayoutPanel2(){        JButton button1=new JButton("按钮 1");        JButton button2=new JButton("按钮 2");        JButton button3=new JButton("按钮 3");        JButton button4=new JButton("按钮 4");        panel2.setLayout(new FlowLayout());        panel2.add(button1);        panel2.add(button2);        panel2.add(button3);        panel2.add(button4);    }    private void LayoutPanel3(){        JButton button1=new JButton("按钮 1");        JButton button2=new JButton("按钮 2");        JButton button3=new JButton("按钮 3");        JButton button4=new JButton("按钮 4");        panel3.setLayout(new GridLayout(2, 2));        panel3.add(button1);        panel3.add(button2);        panel3.add(button3);        panel3.add(button4);    }    private void LayoutPanel4(){        JButton button=new JButton("按钮");        JTextField textField=new JTextField("文本框");        panel4.setLayout(null);        button.setLocation(20,20);        button.setSize(100,20);        textField.setBounds(20, 50, 200, 100);        panel4.add(button);        panel4.add(textField);    }    public static void main(String[] args) {        ComplexLayoutDemo frame=new ComplexLayoutDemo();        frame.setVisible(true);    }}
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