CALL BY VALUE & CALL BY REFERENCE

Call by value & call by reference:

Whenever we want to just use the values which are available in the object memory location without disturbing them, then we should use call by value function.

Whenever we want to directly do the operations in the original object memory location then we should use call by reference function.

Note:

Whenever we use call by value then it will store the values in new memory and do the operation, so it will not affect the original object memory location.

Whenever we use call by reference then it will create new reference to the same object memory, so any operations performed using this new reference will affect the same original object memory location.

Develop a java program which describes call by value & call by reference concept

package pack1;

publicclassbyvalref {

publicinti=10,j=20;

publicvoid swap(inta,int b) {

          int c=a;

              b=a;

              a=c;

          }

publicvoid swap(byvalref ref) {

          int c=ref.i;

          ref.i=ref.j;

          ref.j=c;

          }

publicstaticvoid main(String[] args) {

          byvalref ref1=newbyvalref();

          System.out.println("before swap i & j are:"+ref1.i+"---"+ref1.j);

          ref1.swap(ref1.i,ref1.j);

System.out.println("after swaping i & j using call by value are:"+ref1.i+"---"+ref1.j);

          ref1.swap(ref1);

System.out.println("after swaping i & j using call by ref are:"+ref1.i+"---"+ref1.j);

          } }