将变量与paintComponent一起使用

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

public class MyComponent extends JComponent {
    private int x;
    private int y;

    public MyComponent(int x, int y) {
        this.x = x;
        this.y = y;
    }

    @Override
    protected void paintComponent(Graphics g) {
        super.paintComponent(g);
        g.setColor(Color.RED);
        g.fillOval(x, y, 50, 50);
    }

    public static void main(String[] args) {
        JFrame frame = new JFrame("My Component");
        frame.setDefaultCloseOperation(JFrame.EXIT_ON_CLOSE);
        frame.setSize(300, 300);
        frame.add(new MyComponent(100, 100));
        frame.setVisible(true);
    }
}