Java_draw_grid

import javax.swing.*;
import java.awt.*;
import java.awt.event.MouseEvent;
import java.awt.event.MouseListener;

public class DrawTest  extends JFrame implements MouseListener {


    public DrawTest(){
        setSize(300,300);
        setVisible(true);
        addMouseListener(this);
    }

    private static final long seriaVersionUID =1L;
    int x,y;
    int x1 = 20;
    int x2 = 20;
    public  void  paint(Graphics g){

//        g.drawLine(x,y,x+100, y+100);
        //Horizontale
        g.drawLine(40,90,150,90);
        g.drawLine(40,120,150,120);

        //barre du bas
        g.drawLine(40,150,150,150);

        //cotê gauche
        g.drawLine(40,150,40,90);

        //cotê droit
        g.drawLine(150,90,150,150);
        //Milleu
        g.drawLine(95,90,95,150);

        // horizontal -> x1 et x2
        // vertical -> y1 et Y2
    }

    public void affect(int x,int y) {
        this.x =x;
        this.y =y;
        repaint();//redissiner
    }
    public void mouseClicked(MouseEvent e) {
        int x = e.getX();
        int y = e.getY();
        affect(x,y);
    }

    @Override
    public void mousePressed(MouseEvent e) {

    }

    @Override
    public void mouseReleased(MouseEvent e) {

    }

    @Override
    public void mouseEntered(MouseEvent e) {

    }

    @Override
    public void mouseExited(MouseEvent e) {

    }


    public static void main(String[] args) {
        DrawTest d1 = new DrawTest();
    }

}