开始Java (帮助)

Question

我正在自学AP Java课程，我只是需要一些快速的帮助。我对paintComponent有这个问题。我总是收到覆盖它并为它创建其他内容的消息。这是我为该类编写的代码：

package pkghello;

import java.awt.Graphics;
import java.awt.Graphics2D;
import java.awt.Rectangle;
import javax.swing.JComponent;

/**
 *
 * @author ap
 */
public class RectangleComponent extends JComponent {


    public void paintComponent (Graphics g) //It only highlights "paintComponent"
    {
        Graphics2D g2 = (Graphics2D) g;
        //
        Rectangle box = new Rectangle (5,10,20,30);
        g2.draw(box);
        box.translate(90, 90);
        box.setSize(150,150);
        g2.draw(box);
    }

}

Answer 1

两件事。它可能希望您添加@Override注释，除非您确实需要这样做，否则paintComponent应该保持protected

例如。

@Override
protected void paintComponent (Graphics g)