update,

it114105/itp3914/Lab11/Ex7/Ex7.java

@@ -0,0 +1,7 @@
+public class Ex7 {
+    public static void main(String[] args) {
+        Point p1 = new Point(4, 5);
+        Point p2 = new Point(11, 4);
+        System.out.println("Distance = " + p1.distance(p2));    
+    }
+}

it114105/itp3914/Lab11/Ex7/Point.java

@@ -0,0 +1,28 @@
+public class Point {
+	private int x;
+	private int y;
+ 
+	public Point() {
+		this(0, 0);
+	}
+ 
+	public Point(int x, int y) {
+		setPoint(x, y);
+	}
+ 
+	public void setPoint(int x, int y) {
+		if (x>=0 && y>=0) {
+			this.x = x;
+			this.y = y;
+		}
+	}
+ 
+	public int getX() { return x; }
+	
+ 
+	public int getY() { return y; }
+	
+	public double distance(Point p) {
+		return Math.sqrt((x-p.x)*(x-p.x) + (y-p.y)*(y-p.y));
+	}
+}