JCheckBox是Swing中的复选框。
JCheckBox的常用方法如下图所示:
2 String getUIClassID() 返回一个字符串,该字符串指定呈现此组件的L&F类的名称。
3 boolean isBorderPaintedFlat() 获取borderPaintedFlat属性的值。
4 protected String paramString() 返回此JCheckBox的字符串表示形式。
5 void setBorderPaintedFlat(boolean b) 设置borderPaintedFlat属性,该属性提供有关复选框边框外观的外观提示。
6 void updateUI() 将UI属性重置为当前外观的值
package com.company;
import java.util.ArrayList;
import java.awt.*;
import java.awt.event.*;
import javax.swing.*;
/**
* @author JavaEdge
*/
public class JCheckBoxExample {
private JFrame mainFrame;
private JLabel headerLabel;
private JLabel statusLabel;
private JPanel controlPanel;
public JCheckBoxExample() {
prepareGUI();
}
public static void main(String[] args) {
JCheckBoxExample swingControlDemo = new JCheckBoxExample();
swingControlDemo.showCheckBoxDemo();
}
private void prepareGUI() {
mainFrame = new JFrame("JCheckBox实例");
mainFrame.setSize(400, 400);
mainFrame.setLayout(new GridLayout(3, 1));
mainFrame.addWindowListener(new WindowAdapter() {
@Override
public void windowClosing(WindowEvent windowEvent) {
System.exit(0);
}
});
headerLabel = new JLabel("", JLabel.CENTER);
statusLabel = new JLabel("", JLabel.CENTER);
statusLabel.setSize(350, 100);
controlPanel = new JPanel();
controlPanel.setLayout(new FlowLayout());
mainFrame.add(headerLabel);
mainFrame.add(controlPanel);
mainFrame.add(statusLabel);
mainFrame.setVisible(true);
}
private void showCheckBoxDemo() {
headerLabel.setText("Control in action: CheckBox");
final JCheckBox chkApple = new JCheckBox("Java");
final JCheckBox chkMango = new JCheckBox("Go");
final JCheckBox chkPeer = new JCheckBox("数据库");
chkApple.setMnemonic(KeyEvent.VK_C);
chkMango.setMnemonic(KeyEvent.VK_M);
chkPeer.setMnemonic(KeyEvent.VK_P);
chkApple.addItemListener(e -> statusLabel.setText("Java Checkbox: " + (e.getStateChange() == 1 ? "checked" : "unchecked")));
chkMango.addItemListener(e -> statusLabel.setText("Go Checkbox: " + (e.getStateChange() == 1 ? "checked" : "unchecked")));
chkPeer.addItemListener(e -> statusLabel.setText("数据库 Checkbox: " + (e.getStateChange() == 1 ? "checked" : "unchecked")));
controlPanel.add(chkApple);
controlPanel.add(chkMango);
controlPanel.add(chkPeer);
mainFrame.setVisible(true);
}
}