Java MouseListener新手

Question

我是java的新手，我正在尝试创建一个MouseListener，以便我可以在JFrame中绘制线条。这是我的代码：

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

public class Liner extends JComponent implements MouseListener{

static int MouseX1, MouseY1, MouseX2, MouseY2;
static JFrame window = new JFrame();
static JPanel panel = new JPanel();

public static void main(String[] args){
    panel.addMouseListener(this);
    window.add(panel);
    window.setVisible(true);
    window.pack();
    window.setDefaultCloseOperation(JFrame.EXIT_ON_CLOSE);

}

public void paint(Graphics g){
    g.drawLine(MouseX1,MouseY1,MouseX2,MouseY2);
}


public void mousePressed(MouseEvent e) {
    MouseX1 = e.getX();
    MouseY1 = e.getY();
}
public void mouseReleased(MouseEvent e) {
    MouseX2 = e.getX();
    MouseY2 = e.getY();
}    
} 

我一直在犯同样的错误，包括

  

错误：非静态变量，无法从静态上下文引用           panel.addMouseListener（本）;

和

  

错误：找不到符号public void mouseReleased（MouseEvent e）{

（第二个引用“MouseEvent”）。