Java 入门图形用户界面设计之复选框

Java程序设计 图形用户界面 【十】复选框

复选框JCheckBox

JCheckBox类

import javax.swing.*;
import java.awt.*;
import java.awt.event.WindowAdapter;
import java.awt.event.WindowEvent;

class MyCheckBox{
    private JFrame frame = new JFrame("一");
    private Container cont =frame.getContentPane();
    private JCheckBox jcb1 = new JCheckBox("A");
    private JCheckBox jcb2 = new JCheckBox("B");
    private JCheckBox jcb3 = new JCheckBox("C");
    private JPanel pan = new JPanel();
    public MyCheckBox(){
        pan.setBorder(BorderFactory.createTitledBorder("请选择"));
        pan.setLayout(new GridLayout(1,3));
        pan.add(this.jcb1);
        pan.add(this.jcb2);
        pan.add(this.jcb3);
        cont.add(pan);
        this.frame.setSize(330,80);
        this.frame.setVisible(true);
        this.frame.addWindowListener(new WindowAdapter() {
            @Override
            public void windowClosing(WindowEvent e) {
                super.windowClosing(e);
                System.exit(1);
            }
        });
    }
}
public class Hello {
    public static void main(String[] args) {
        new MyCheckBox();
    }
}

与单选按钮不同的是，此时选择的地方变成了“□”型，与各个系统中常见的复选框形式是一样的

JCheckBox事件处理

JCheckBox和JRadioButton的事件处理监听接口是一样的，都是使用ItemListener接口

使用ItemListener接口进行事件的监听

ItemEvent类

import javax.swing.*;
import java.awt.*;
import java.awt.event.ItemEvent;
import java.awt.event.ItemListener;
import java.awt.event.WindowAdapter;
import java.awt.event.WindowEvent;

class MyCheckBox {
    private JFrame frame = new JFrame("一");
    private Container cont = frame.getContentPane();
    private JCheckBox jcb1 = new JCheckBox("A");
    private JPanel pan = new JPanel();
    private JLabel a = new JLabel("未选中");
    public MyCheckBox(){
        pan.setLayout(new GridLayout(1,2));
        pan.add(a);
        pan.add(this.jcb1);
        jcb1.addItemListener(new ItemListener() {
            @Override
            public void itemStateChanged(ItemEvent e) {
                JCheckBox jcb = (JCheckBox) e.getItem();
                if(jcb.isSelected()){
                    a.setText("选中");
                }else {
                    a.setText("未选中");
                }
            }
        });
        cont.add(pan);
        this.frame.setSize(300,100);
        this.frame.setVisible(true);
        this.frame.addWindowListener(new WindowAdapter() {
            @Override
            public void windowClosing(WindowEvent e) {
                super.windowClosing(e);
                System.exit(1);
            }
        });
    }
}
public class Hello {
    public static void main(String[] args) {
        new MyCheckBox();
    }
}

选中选项改变 文字

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