18. 按钮的进一步学习

图片按钮，单选框，多选框

package GUI;

import javax.swing.*;
import java.awt.*;
import java.net.URL;
// 按钮的进一步学习
// 图片按钮，单选框，多选框，本质上也是按钮
public class Test18 {
    public static void main(String[] args) {
        new JButtonDemo();
        new JRadioButtonDemo();
        new JCheckBoxButtonDemo();
    }
}

// 图标按钮
class JButtonDemo extends JFrame{
    public JButtonDemo()   {
        Container container = getContentPane();
        // 把一张图片变成图标
        URL resource = JButtonDemo.class.getResource("piture.png");
        ImageIcon imageIcon = new ImageIcon(resource);

        // 将图标放在按钮上
        JButton jButton = new JButton(imageIcon);
        jButton.setToolTipText("这是图片按钮，也是提示");  // 将鼠标放在按钮上出现的提示文字

        container.add(jButton);

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

// 单选框,单个圆圈的
class JRadioButtonDemo extends JFrame{
    public JRadioButtonDemo()  {
        Container container = getContentPane();

        // 单选框（也是按钮），JRadioButton。分组，一组中只能选一个
        JRadioButton jRadioButton1 = new JRadioButton("jRadioButton1");
        JRadioButton jRadioButton2 = new JRadioButton("jRadioButton2");
        JRadioButton jRadioButton3 = new JRadioButton("jRadioButton3");

        ButtonGroup buttonGroup = new ButtonGroup();  // 分组,只能选择其中一个
        buttonGroup.add(jRadioButton1);
        buttonGroup.add(jRadioButton2);
        buttonGroup.add(jRadioButton3);

        container.add(jRadioButton1,BorderLayout.NORTH);
        container.add(jRadioButton2,BorderLayout.CENTER);
        container.add(jRadioButton3,BorderLayout.SOUTH);

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

// 多选框，打勾的
class JCheckBoxButtonDemo extends JFrame{
    public JCheckBoxButtonDemo()  {
        Container container = getContentPane();

        JCheckBox jCheckBox1 = new JCheckBox("jCheckBox1");
        JCheckBox jCheckBox2 = new JCheckBox("jCheckBox2");
        JCheckBox jCheckBox3 = new JCheckBox("jCheckBox3");

        container.add(jCheckBox1,BorderLayout.NORTH);
        container.add(jCheckBox2,BorderLayout.CENTER);
        container.add(jCheckBox3,BorderLayout.SOUTH);

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