update,

it114105/itp3914/Lab11/ques_source/Ex1_Ex2/Circle.java

@@ -0,0 +1,11 @@
+class Circle {
+	private double radius;
+ 
+	public Circle(double r) {
+		radius = r;
+	}
+ 
+	public double area() {
+		return radius*radius*Math.PI;
+	}
+}

it114105/itp3914/Lab11/ques_source/Ex1_Ex2/Ex1.java

@@ -0,0 +1,33 @@
+class Circle {
+	private double radius;
+ 
+	public Circle(double r) {
+		radius = r;
+	}
+ 
+	public double area() {
+		return radius*radius*Math.PI;
+	}
+}
+
+class Rectangle {    
+    private double length;     
+    private double width;
+    public Rectangle(double l, double w)  {
+         length = l;        
+         width = w;    
+    }
+    public double area()  {        
+         return length * width;    
+    } 
+}
+
+public class Ex1 {
+	public static void main(String [] args) {
+		Rectangle r = new Rectangle(30.1, 10.2);
+		Circle c = new Circle(5.3);
+ 
+		System.out.println("r=" + r);
+		System.out.println("c=" + c);
+	}
+}	

it114105/itp3914/Lab11/ques_source/Ex1_Ex2/Ex2.java

@@ -0,0 +1,15 @@
+public class Ex2 {
+	public static void main(String [] args) {
+		Rectangle r = new Rectangle(1, 2);
+		System.out.println("r=" + r);
+		System.out.println("area=" + r.area());
+ 
+		r = new Rectangle(3, 4);
+		System.out.println("r=" + r);
+		System.out.println("area=" + r.area());
+ 
+		r = null;
+		System.out.println("r=" + r);
+		System.out.println("area=" + r.area());
+	}
+}

it114105/itp3914/Lab11/ques_source/Ex1_Ex2/Rectangle.java

@@ -0,0 +1,11 @@
+class Rectangle {    
+    private double length;     
+    private double width;
+    public Rectangle(double l, double w)  {
+         length = l;        
+         width = w;    
+    }
+    public double area()  {        
+         return length * width;    
+    } 
+}

it114105/itp3914/Lab11/ques_source/Ex3/Triangle.java

@@ -0,0 +1,24 @@
+class Triangle {
+	private int base;
+	private int height;
+ 
+	public Triangle() {
+		base = 0;
+		height = 0;
+	}
+ 
+	public Triangle(int base, int height) {
+		this.base = base;
+		this.height = height;
+	}
+ 
+	public void printThis() {
+		System.out.println(this);
+	}
+ 
+	public static void main(String [] args) {
+		Triangle t = new Triangle(1, 2);
+		System.out.println(t);
+		t.printThis();
+	}
+}

it114105/itp3914/Lab11/ques_source/Ex4/DataUser.java

@@ -0,0 +1,28 @@
+class Date {
+	private int day;
+	private int month;
+	private int year;
+ 
+	public Date() {
+		this(1, 1, 1970);
+	}
+ 
+	public Date(int day, int month, int year) {
+		this.day = day;
+		this.month = month;
+		this.year = year;
+	}
+ 
+	public String toString() {
+		return "[" + day + "/" + month + "/" + year + "]";
+	}
+}
+
+
+public class DataUser {
+    public static void main(String [] args) {
+		Date d1 = new Date();
+ 
+		System.out.println(d1);
+	}
+}

it114105/itp3914/Lab11/ques_source/Ex5/Q1Main.java

@@ -0,0 +1,13 @@
+public class Q1Main {
+    public static void main(String [] args) {
+		QuestionOne q1 = new QuestionOne(); //line1
+		q1.A = 12; //line2
+		q1.b = 12; //line3
+		q1.c = 12; //line4
+		q1.methodOne(12); //line5
+		q1.methodOne();//line6
+		System.out.println(q1.methodTwo());//line7
+		q1.b = q1.methodTwo();//line8
+  	}
+
+}

it114105/itp3914/Lab11/ques_source/Ex5/QuestionOne.java

@@ -0,0 +1,12 @@
+public class QuestionOne {
+	public final int A = 345;
+	public int b;
+	private float c;
+ 
+	private void methodOne(int a) {
+		b = a;
+	}
+	public float methodTwo() {
+		return 23;
+	}
+}