Passing Reference As Parameter In Android

I am newbie in java/android. I am a c/c++ developer. May i know how to pass a reference as parameter in android. An illustrative c sample code shown below void main() { int no1

Solution 1:

You cannot pass an int as reference in Java. int is a primary type, it can be passed only by value.

If you still need to pass an int variable as reference you can wrap it in a mutable class, for example an int array:

voidfindsum( int no1, int no2, int[] sum ){
  sum[0] = no1 + no2;
}

Anyway, I strongly suggest you to refactor your code to be more object oriented, for example:

classSumOperation {
   privateintvalue;

   publicSumOperation(int no1, int no2) {
      this.value = no1 + no2;
   }

   publicintgetReturnValue() { returnthis.value; }
}

Solution 2:

There is no pass by reference in Java.

Solution 3:

This is how I solved this problem:

// By using a wrapper class.// This also works with Class objects.classIntReturn {
    publicint val;
}

// For example:classStringReturn {
    public String val;
}

classMain {
    publicstaticvoidmain(){
        IntReturniRtn=newIntReturn();
        
        if(tryAdd(2, 3, iRtn)){
            System.out.println("tryAdd(2, 3): " + iRtn.val);
        }
    }

    publicstaticbooleantryAdd(finalint a, finalint b, final IntReturn iRtn){
        iRtn.val = a + b;

        returntrue;  // Just something to use return
    }
}

I have a personal library of these types of classes for this purpose. Lambdas are another reason for these classes as you need to have a 'final' variable to get a value out of a Lambda, other than by return statement.