return value???

[Suka Hati]

i have 2 class....class A and class B....in class A i want to call a method in class B and send 2 parameter(v1 and v2).....in class B, it will transform v1 and v2 into v3 and v4.....the problem is...i need to send back the 2 new variables(v3 & v4) to class A....we can only return one value.....so, what i can do to send v3 & v4 back to class A???

[Ben Souther]

You can return an array if the values are of the same type or you can send back an object that contains the two values as it's properties.

[Suka Hati]

if i send back an object does that means after that i can separate it into 2...???

[Ben Souther]

Yes, create setter and getter methods for the two properties.

Set the two properties from within your method, return the object and then read the properties to get the values.

[Suka Hati]

sorry...i cant really understand u....can u give me some example...

[David Harkness]

If v1 and v2 are objects instead of primitives, the easiest solution is an Object array (or a specific array if they have the same class). Here's a trivial example:

String [] flip ( String x , String y )
{
    return new String [] { y, x } ;
}
 
...
 
String a = "Hi";
String b = "There";
String [] flipped = flip(a, b);
 
System.out.println("1st -> " + flipped[0]);
System.out.println("2nd -> " + flipped[1]);

This will output the following.

1st -> There
2nd -> Hi

Does that clarify it? Ben's suggestion is to define a class with fields that will hold the returned objects along with a pair of get/set methods (accessors) for each. This class would satisfy the JavaBean requirements, so you might want to look that up at Sun's Java site if you need examples.

[Ben Souther]

I hope this isn't too hard to read.
I tried to make it, simple, terse, and readable, in a short amount of time.

      1 public class A{
      2     public static void main(String[] args){
      3
      4         //instanciate class B.
      5         B b = new B();
      6
      7         int    value1 = 2;
      8         String value2 = "two";
      9
     10         C c = b.doubleThem(value1, value2);
     11
     12         System.out.println("value1: " + c.getValue1());
     13         System.out.println("value2: " + c.getValue2());
     14     }
     15 }
     16
     17 class B{
     18     /**
     19      * Absurd method that doubles two completely dissimilar types.
     20      */
     21     public C doubleThem(int value1, String value2){
     22         value1 *= 2;
     23         value2 += value2;
     24
     25         C c = new C();
     26         c.setValue1(value1);
     27         c.setValue2(value2);
     28         return c;
     29     }
     30 }
     31
     32 /**
     33  * Exposes two properties with getter/setter (accessor/mutator) methods.     
     34  */
     35 class C{
     36     private int    value1;
     37     private String value2;
     38
     39     public int getValue1(){
     40         return this.value1;
     41     }
     42     public void setValue1(int value1){
     43         this.value1 = value1;
     44     }
     45
     46     public String getValue2(){
     47         return this.value2;
     48     }
     49     public void setValue2(String value2){
     50         this.value2 = value2;
     51     }
     52 }

[ February 22, 2005: Message edited by: Ben Souther ]

[Suka Hati]

thanks everybody....i manage to solve my problem....thanks to ben and david...i really appreciate the help from both of u...

[Kartik Mahadevan]

Hii

Can we define a function in A class which can take 2 variables and call the function in B class so that v3 and v4 can be sent to class A ?

Thanks
Regards
M.Kartik

[Ben Souther]

Originally posted by Kartik Mahadevan:
Hii

Can we define a function in A class which can take 2 variables and call the function in B class so that v3 and v4 can be sent to class A ?

Thanks
Regards
M.Kartik

Yes