GUI编程(五)Swing的简单应用

3、Swing

3.1 、窗口、面板

package com.study.lesson04;

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

public class JFrameDemo {

    //init(): 初始化
    public void init(){
        //顶级窗口
        JFrame jf = new JFrame("这是一个JFrame窗口");
        jf.setVisible(true);
        jf.setBounds(100,100,200,200);
        jf.setBackground(Color.cyan);
        //设置文字 JLabel

        JLabel label = new JLabel("欢迎来到");

        jf.add(label);
        //关闭事件
        jf.setDefaultCloseOperation(WindowConstants.EXIT_ON_CLOSE);
    }

    public static void main(String[] args) {
        //建立一个窗口
        new JFrameDemo().init();
    }
}

标签居中

setHorizontalAlignment

package com.study.lesson04;

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

public class JframeDeno02 {
    public static void main(String[] args) {
        new MyJframe2().init();
    }
}

class MyJframe2 extends JFrame{
    public void init(){
        this.setVisible(true);
        this.setBounds(10,10,200,300);
        JLabel label = new JLabel("欢迎来到");

        this.add(label);


        //让我们的文本标签居中，设置水平对齐
        label.setHorizontalAlignment(SwingConstants.CENTER);

        //获得一个容器
        Container container = this.getContentPane();
        container.setBackground(Color.YELLOW);
    }
}

3.2 、弹窗

JDialog，用来被弹出，默认就有断臂事件！

package com.study.lesson04;

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

//主窗口
public class DialogDemo extends JFrame {

    public DialogDemo(){
        this.setVisible(true);
        this.setSize(700,500);
        this.setDefaultCloseOperation(WindowConstants.EXIT_ON_CLOSE);

        //JFrame  放东西，容器
        Container container = this.getContentPane();
        //绝对布局
        container.setLayout(null);

        //按钮
        JButton button = new JButton("点击弹出一个对话框");//创建
        button.setBounds(30,30,200,50);

        //点击这个按钮的时候，弹出一个弹窗
        button.addActionListener(new ActionListener() {//监听器
            @Override
            public void actionPerformed(ActionEvent e) {
                //弹窗
                new MyDialogDemo();
            }
        });

        container.add(button);


    }

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

//弹窗的窗口
class MyDialogDemo extends JDialog{
    public MyDialogDemo() {
        this.setVisible(true);
        this.setBounds(100,100,500,500);
        //this.setDefaultCloseOperation(WindowConstants.EXIT_ON_CLOSE);

        Container container = this.getContentPane();
        container.setLayout(null);

        container.add(new Label("积极向上锁子哥"));

    }
}

3.3、标签

label

new JLabel("xxx");

图标ICON

图片CON

package com.study.lesson04;

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

public class ImageIconDemo extends JFrame {
    
    public ImageIconDemo() {
        //获取图片的地址
        JLabel label = new JLabel("ImageIcon");
        URL url = ImageIconDemo.class.getResource("tx.jpg");

        ImageIcon imageIcon = new ImageIcon(url);//命名不要冲突了
        label.setIcon(imageIcon);
        label.setHorizontalAlignment(SwingConstants.CENTER);


        Container container = getContentPane();
        container.add(label);

        setVisible(true);
        setDefaultCloseOperation(WindowConstants.EXIT_ON_CLOSE);
        setBounds(100,100,200,200);
    }

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

3.4、面板

JPanel

package com.study.lesson05;

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

public class JPanelDemo extends JFrame {

    public JPanelDemo(){
        Container container = this.getContentPane();

        container.setLayout(new GridLayout(2,1,10,10));//豆面两个参数的意思，间距


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

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

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

        this.setVisible(true);
        this.setSize(500,500);
        this.setDefaultCloseOperation(WindowConstants.EXIT_ON_CLOSE);
    }


    public static void main(String[] args) {

        new JPanelDemo();
    }
}

JSrollPanel

package com.study.lesson05;

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

public class JScrollDemo extends JFrame {

    public JScrollDemo() {
        Container container = this.getContentPane();

        //文本域
        JTextArea textArea = new JTextArea(20, 50);
        textArea.setText("欢迎学习");

        //Scroll面板
        JScrollPane scrollPane = new JScrollPane(textArea);
        container.add(scrollPane);

        this.setVisible(true);
        this.setBounds(100,100,300,150);
        this.setDefaultCloseOperation(WindowConstants.EXIT_ON_CLOSE);
    }


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