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    For example:

                     1  class rectangle2
                     2  {

                     3      int length, breadth, area, perimeter;
                     4      rectangle2 (int l, int b)
                     5      {

                     6         length=l;
                     7         breadth=b;
                     8      }

                     9      rectangle2 (rectangle2 r)
                     10      {
                     11         length = r.length;

                     12           breadth=r.breadth;
                     13      }

                     14      void cal()
                     15      {
                     16         area = length * breadth;

                     17         perimeter = 2*(length+breadth);
                     18      }
                     19

                     20      void display ()
                     21      {
                     22          System.out.println("Area of Rectangle:" + area);

                     23          System.out.println("Perimeter of Rectangle:" + perimeter);
                     24      }

                     25      public static void main(String[] args)
                     26      {
                     27          rectangle2 ob1 = new rectangle2 (5,4);
                     28

                     29         rectangle2 ob2 = new rectangle2(ob1);
                     30         ob1.cal ();

                     31         ob1.display();
                     32         ob2.cal ();
                     33         ob2.display();

                     34      }
                     35  }

                                                                                                   Java Programming    121

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