add lab11

lab/lab11/Question2/MyPanel.java

@@ -0,0 +1,38 @@
+import java.awt.Color;
+import java.awt.Graphics;
+import java.awt.event.MouseAdapter;
+import java.awt.event.MouseEvent;
+
+import javax.swing.JPanel;
+
+public class MyPanel extends JPanel {
+	private int x = -1;
+	private int y = -1;
+
+	public MyPanel() {
+		this.addMouseListener(new MouseAdapter() {
+			// Anonymous class.
+			public void mouseClicked(MouseEvent e) {
+				// Check whether the left mouse button is clicked
+				if (e.getButton() == MouseEvent.BUTTON1) {
+					x = e.getX();
+					y = e.getY();
+					// get the coordinate
+					System.out.println("(" + e.getX() + "," + e.getY() + ")");
+					// force Swing to repaint the red point
+					repaint();
+				}
+
+			}
+		});
+	}
+
+	@Override
+	protected void paintComponent(Graphics g) {
+		// must clean the panel before drawing on it.
+		super.paintComponent(g);
+		g.setColor(Color.RED);
+		// draw the red square
+		g.drawRect(x, y, 1, 1);
+	}
+}