Question

I have created a method which is supposed to return type double and here is my code

private void myMethod()  
{ 
    if(myArrayList.size() >= 2) 
    {
        Double  t = myArrayList.get(myArrayList.size()-1);
        Double  d = myArrayList.get(myArrayList.size()-2); 
        Double result = ( t+ d  ) / 2 ;
        System.out.println("Average is: "+result);
    }
}

I change void to double and just after system.out….. line i added return result but this gives an error!! Could you please tell me how exactly i can change this method so that i obtain a return type of double?

Answer 1

To sum things up, all the previous answer are right, but lack some minor detail, like @dinesh707 says, you must be able to return on every method branch (unless an exception occurs). And also be sure to declare the result variable outside the decision/if block, and to declare that the method return a double, and you should go with the double primitive, not the boxed version.

so the code looks like:

private double myMethod() { 
double result=0; 
if(myArrayList.size() >= 2) { 
    double t = myArrayList.get(myArrayList.size()-1); 
    double d = myArrayList.get(myArrayList.size()-2); 
    result = ( t+ d ) / 2 ; 
    System.out.println("Average is: "+result); 
} 
return result; 

}