Primitive data type reference

Question

I would like to make function that could return several primitive data types to caller.

I know I can return function result for first primitive, but how to return primitive in function param?

public boolean myFunc( boolean outAnotherPrimitive)
{
outAnotherPrimitive = true; //need to return value to caller
return true;
}

Is it only way to return primitive to wrap it into Object like Integer or Boolean?

Answer 1

Is it only way to return primitive to wrap it into Object like Integer or Boolean?

Not at all,

I think its not good practice to convert your variables to Object and after fetch them back with cast or instanceof .

• you can use Interface as callback .

example:

OtherClass

 public class OtherClass{

....

public void myFunc( boolean anotherPrimitive, MyinterfaceItf myItf)
{
 boolean bool = false;
 int a = 1; 
  myItf.onFinish(bool, a)
}
....
}

MyClass:

public class MyClass implements MyinterfaceItf {

 ....

 private void foo()
 {
    MyinterfaceItf itf = this;

    myFunc(true, itf );
 }

 @override
 public void onFinish(bool, a){
   // here you can get your primitive data 
 }

}

interface

public interface MyinterfaceItf{
 public void onFinish(bool, a);
} 

• Other option to use variables as global

example:

private boolean bool = false;
private int num = 0;


public boolean myFunc( boolean anotherPrimitive)
{
 bool = anotherPrimitive;
 num = 10;
 //....
}

• Next option to create new Class and use it instead primitives.

example:

public class NewClass{
 private boolean bool = false;
 private int num = 0;
 //...

 public void setBool(boolean flag){
     this.bool = flag;
  }
}

 public boolean myFunc( boolean anotherPrimitive, NewClass newClass)
 {
   return newClass.setBool(true);
  }

(I wrote it in local editor, sorry for syntax)