Merge pull request #4 from jayanpraveen/master

added oop programs

Author: engineerscodes

OOP/classDemo.java

@@ -0,0 +1,45 @@
+class Pet
+{
+    String name;                          // Instance variables
+    int count;
+    
+    public void setName(String name)       
+    {
+        this.name = name;
+    }
+
+    public void setCount(int count)        
+    {
+        this.count = count;
+    }
+
+    void getName()                        
+    {
+        System.out.println("Pet: "+ name);
+    }
+
+    void getCount()                       
+    {
+        System.out.println("Count: " + count);
+    }
+}
+
+public class classDemo
+{
+    public static void main(String[] args)
+    {
+        Pet obj = new Pet();
+
+        obj.setName("Dog");
+        obj.setCount(10);
+
+        obj.getName();
+        obj.getCount();
+
+        obj.setName("Cat");
+        obj.setCount(7);
+
+        obj.getName();
+        obj.getCount();
+    }
+}

OOP/constructorDemo.java

@@ -0,0 +1,31 @@
+class Shape
+{
+    float length, breadth, height;
+    float result;
+
+    Shape()
+    {
+        System.out.println("Shapes:");
+    }
+    Shape (float length, float breadth)
+    {
+        result = length * breadth;
+        System.out.println("Area of rectangle: " + result);
+    }
+
+    Shape (float length, float breadth, float height)
+    {
+        result = length * breadth * height;
+        System.out.println("Area of triangle: " + result);
+    }
+}
+
+public class constructorDemo
+{
+    public static void main(String[] args)
+    {
+        new Shape();
+        new Shape(54f, 12f);
+        new Shape(48f, 24f, 45f);
+    }
+}

OOP/thisDemo.java

@@ -0,0 +1,30 @@
+class Sample
+{
+    int value;
+
+    Sample()
+    {
+        this("Passed_value");
+    }
+
+    public Sample(String str)
+    {
+        System.out.println(str + " by this()");
+    }
+
+    public void setValue (int value)
+    {
+        this.value = value;
+    } 
+}
+public class thisDemo
+{
+    public static void main(String[] args)
+    {
+        Sample obj = new Sample();
+        
+        obj.setValue(123);
+        System.out.println(obj.value);
+    }
+}
+