GUI programming core technology Swing-JPanel panel, text area TextArea and JScroll scrolling pane

GUI programming core technology Swing-JPanel panel, text area TextArea and JScroll scrolling pane

JPanel panel

package com.wei.lesson10;


import javax.swing.*;
import java.awt.*;
import java.awt.event.ActionEvent;
import java.awt.event.ActionListener;

public class JPanelDemo extends JFrame {
    
    
    public JPanelDemo(){
    
    
        Container container = getContentPane();
        //表格布局                                           每个面板之间的上下间距
        container.setLayout(new GridLayout(2,2,10,10));

        JPanel panel1 = new JPanel(new GridLayout(1,2));
        JPanel panel2 = new JPanel(new GridLayout(2,1));
        JPanel panel3 = new JPanel(new GridLayout(1,3));
        JPanel panel4 = new JPanel(new GridLayout(3,1));


        panel1.add(new Button("1"));
        panel1.add(new Button("1"));
        panel2.add(new Button("2"));
        panel2.add(new Button("2"));
        panel3.add(new Button("3"));
        panel3.add(new Button("3"));
        panel3.add(new Button("3"));
        panel4.add(new Button("4"));
        panel4.add(new Button("4"));
        panel4.add(new Button("4"));

        container.add(panel1);
        container.add(panel2);
        container.add(panel3);
        container.add(panel4);

        this.setVisible(true);
        this.setSize(600,600);
        this.setDefaultCloseOperation(WindowConstants.EXIT_ON_CLOSE);


    }

    public static void main(String[] args){
    
    
        new JPanelDemo();


    }
}

TextArea and JScroll scrolling pane

package com.wei.lesson10;

import javax.swing.*;
import java.awt.*;

public class JScrollDemo extends JFrame {
    
    
    public JScrollDemo(){
    
    
        Container container = getContentPane();

        //文本域，可以换行
        JTextArea textArea = new JTextArea(20, 50);
        textArea.setText("零基础学java，从入门到入土");
        //建一个ScrollPane滚动窗格，把textArea放进去
        JScrollPane scrollPane = new JScrollPane(textArea);

        //把ScrollPane滚动窗格放到容器里
        container.add(scrollPane);

        this.setBounds(100,100,500,800);
        this.setVisible(true);
        this.setDefaultCloseOperation(WindowConstants.EXIT_ON_CLOSE);

    }

    public static void main(String[] args) {
    
    
        new JScrollDemo();
    }

}