{{{~cpp import java.awt.Graphics; import java.awt.event.MouseAdapter; import java.awt.event.MouseEvent; import java.awt.event.MouseAdapter.*; import java.awt.event.MouseEvent.*; import javax.swing.*; public class FirstJava extends JFrame{ int x,y; int counter=0; int array[][] = new int [3][3]; public FirstJava() { for(int j=0;j<3; j++) { for(int i=0; i<3;i++) array[i][j] = -1; } addMouseListener(new MouseAdapter() { public void mouseClicked(MouseEvent e) { x = e.getX(); y = e.getY(); System.out.println("x 좌표 : " + x); System.out.println("y 좌표 : " + y); repaint(); } }); } public static void main(String args[]) { FirstJava helloWorld = new FirstJava(); helloWorld.setBounds(100,100,600,600); helloWorld.show(); } public void paint(final Graphics g) { g.drawLine(100,0,100,300); g.drawLine(200,0,200,300); g.drawLine(0,100,300,100); g.drawLine(0,200,300,200); if (0