swing JCheckBox 更换复选框样式

Java Swing - 如何自定义JCheckBox复选标记图标

摘自 https://www.w3cschool.cn/java/codedemo-484050311.html

 import java.awt.Color;
 import java.awt.Component;
 import java.awt.Graphics;
 import java.awt.GridLayout;

 import javax.swing.AbstractButton;
 import javax.swing.ButtonModel;
 import javax.swing.Icon;
 import javax.swing.JCheckBox;
 import javax.swing.JFrame;

 class CheckBoxIcon implements Icon {
   public void paintIcon(Component component, Graphics g, int x, int y) {
     AbstractButton abstractButton = (AbstractButton) component;
     ButtonModel buttonModel = abstractButton.getModel();

     Color color = buttonModel.isSelected() ? Color.BLUE : Color.RED;
     g.setColor(color);

     g.drawRect(1, 1, 20, 20);

   }

   public int getIconWidth() {
     return 20;
   }

   public int getIconHeight() {
     return 20;
   }
 }

 public class Main {
   public static void main(String args[]) {
     JFrame frame = new JFrame();
     frame.setDefaultCloseOperation(JFrame.EXIT_ON_CLOSE);
     Icon checked = new CheckBoxIcon();
     Icon unchecked = new CheckBoxIcon();
     JCheckBox aCheckBox1 = new JCheckBox("Pizza", unchecked);
     aCheckBox1.setSelectedIcon(checked);
     JCheckBox aCheckBox2 = new JCheckBox("Calzone");

     aCheckBox2.setIcon(unchecked);
     aCheckBox2.setSelectedIcon(checked);
     Icon checkBoxIcon = new CheckBoxIcon();
     JCheckBox aCheckBox3 = new JCheckBox("Anchovies", checkBoxIcon);
     JCheckBox aCheckBox4 = new JCheckBox("Stuffed Crust", checked);
     frame.setLayout(new GridLayout(0, 1));
     frame.add(aCheckBox1);
     frame.add(aCheckBox2);
     frame.add(aCheckBox3);
     frame.add(aCheckBox4);
     frame.setSize(300, 200);
     frame.setVisible(true);
   }
 }

 //关键几行：
 URL uncheckedIconUrl = Thread.currentThread().getContextClassLoader().getResource("unchecked.png");
 URL checkedIconUrl = Thread.currentThread().getContextClassLoader().getResource("checked.png");
 Icon uncheckedIcon = new ImageIcon(uncheckedIconUrl);
 Icon checkedIcon = new ImageIcon(checkedIconUrl);

 JCheckBox cb = new JCheckBox("苹果");

 cb.setIcon(uncheckedIcon);
 cb.setSelectedIcon(checkedIcon);