How to store method return type in primitive

[Prakash Rai]

class Hello{
	/* int m1(){
		System.out.println("m1()");
		return 99;
	}
	int a=m1();
	{
		System.out.println(a);
	}*/
	int m1(int a,int b){  //How Assign  return type of method m1().
	System.out.println("m1(int a, int b) ");
	return a+b;
	}
	double m1(double a,double b){
		System.out.println("m1(double a,double b)");
		return a+b;
	}
	//int i=m1(int a,int b); it gives error.
}
public class Test{
	public static void main(String arg[]){
	Hello h1=new Hello();
	h1.m1(10,20);
	h1.m2(10.1,11.5);
	}
}

Q1. How to Use return type of methods?

[Mohamed Sanaulla]

The methods return some value- How do you assign a value to a variable?-

int a=10;
int b= instance.methodName(10,20);

[Prakash Rai]

Mohamed Sanaulla wrote:The methods return some value- How do you assign a value to a variable?-

int a=10;
int b= instance.methodName(10,20);

The code I have commented in that way I want to assign return value of the method in a variable.

[Mohamed Sanaulla]

Somprakash Rai wrote:The code I have commented in that way I want to assign return value of the method in a variable.

You cannot do that way- Its not a legal way to invoke the methods. Did you look at what error the compiler reported?

[Prakash Rai]

Mohamed Sanaulla wrote: ^
Test13.java:7: ')' expected
int d=a1.m1(int a,int b);
^
2 errors

It means we assign only simple method return values to primitive.and We can can not assign argumented method value to primitive?

Somprakash Rai wrote:The code I have commented in that way I want to assign return value of the method in a variable.

You cannot do that way- Its not a legal way to invoke the methods. Did you look at what error the compiler reported?

[Matthew Brown]

It's nothing to do with primitives. It's just to do with how you can call methods.

[Mohamed Sanaulla]

You cannot declare the arguments in the method call- You need to pass either variables which are initialized to some value or some value itself.

[Prakash Rai]

Thanks Now am clear with this topic...

[Rob Spoor]

Somprakash Rai wrote:

int i=m1(int a,int b);

Mohamed Sanaulla wrote:

int b= instance.methodName(10,20);

Somprakash, do you see a big difference between the way you call the method and the way Mohamed calls the method?

Edit: waaaayyyy to late...

[Prakash Rai]

Rob Spoor wrote:

Somprakash Rai wrote:

int i=m1(int a,int b);

Mohamed Sanaulla wrote:

int b= instance.methodName(10,20);

Yeah Sure but it can called this way also
int i=m1(10,20);

Somprakash, do you see a big difference between the way you call the method and the way Mohamed calls the method?

Edit: waaaayyyy to late...

[Prakash Rai]

Anyone please tell that where this return value is being stored?

[Mohamed Sanaulla]

You might want to carefully use the "Quote" tag? Confusing to find out your reply from the text in the above post. But I think it should be this:

Somprakash Rai wrote:
Yeah Sure but it can called this way also
int i=m1(10,20);

Yes it can be called. Please try to experiment with the code and the compiler will provide you with the required error messages.

[Mohamed Sanaulla]

Somprakash Rai wrote:Anyone please tell that where this return value is being stored?

What is the confusion? Can you show us the code you are trying out?

[Prakash Rai]

I have been taught somewhere that what ever return type we are using in side a method that return is being send to OS. But As I seen that return type can stored in primitive and that can used.At this point I wanted to know that the return type we are assign to primitive variable where that value is being stored in method or...........

[Jesper de Jong]

When you call a method and you assign the result of the method to a variable, then the return value of the method is stored in the variable. It doesn't matter if the method returns a primitive value or a reference (to an object) - it works the same way. If you don't assign the return value of a method to a variable, then the value just disappears - it's not stored anywhere, it's just thrown away.

Nothing is being sent to the operating system. The operating system doesn't have anything to do with the return values of methods directly.

[Prakash Rai]

Thanks ...

Jesper de Jong wrote:When you call a method and you assign the result of the method to a variable, then the return value of the method is stored in the variable. It doesn't matter if the method returns a primitive value or a reference (to an object) - it works the same way. If you don't assign the return value of a method to a variable, then the value just disappears - it's not stored anywhere, it's just thrown away.

Nothing is being sent to the operating system. The operating system doesn't have anything to do with the return values of methods directly.

[Rob Spoor]

Jesper de Jong wrote:Nothing is being sent to the operating system. The operating system doesn't have anything to do with the return values of methods directly.

True. In C and C++ the return value of the main function was sent to the OS, but in Java that must be done using System.exit(int).