program to Add of two no. using method seter geter in java
package add_returnvalue;
import java.util.Scanner;
public class Add_returnvalue {
    int a=0,b=0;
                public
void setA(int c)
                {
                                a=c;        
                }
                public
int getA(){
                                return
a;
                }
                public
void setB(int d)
                {
                                b=d;       
                }
                public
int getB(){
                                return
b;
                }
                public
int sum(){
                                int
s=0; 
                                s=a+b;  
                                return
s;
    }
    public static void main(String[] args) {
        // TODO code application logic here
       Scanner obj= new Scanner(System.in);
                                Add_returnvalue
d1= new Add_returnvalue();
                                System.out.println("
this program for Add of 2 no. plz enter a and b value:");
                                int
a= obj.nextInt();
                                int
b= obj.nextInt();
                                d1.setA(a);
                                d1.setB(b);
                                System.out.println("Value
of A is :"+d1.getA());
                                System.out.println("Value
of B is :"+d1.getB());
                                System.out.println("Add
of 2 values is:"+d1.sum());        
    }
}
If you
declare private member in a class and want to call different class then you can
you setter getter concept.
Below the
program mention using setter getter method.
Create
multi.java class
package add_returnvalue;
public class multi {
    private int a;
    private int b;
    public void setA(int a){
      this.a= a; 
    }
    public int getA(){
        return a;
    }
    public void setB(int b){
        this.b= b;
    }
    public int getB(){
        return b;
    }   
}
create main class multi_mainclass.java 
in this class calling the private member from the other
class
package add_returnvalue;
public class multi_mainclass {
    public static void main(String[] args) {
    multi ml = new multi();
    ml.setA(20);
    ml.setB(10);
    System.out.println(ml.getA()*ml.getB());
}
}
Output:

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