How to pass variables in java What is the JavaChamp Team Flash Card

Question 121 / 297: What is the result of compiling and running the following code?

public class Tester {

	int x = 12;

	static void reset(Tester obj) {
		obj = null;
	}

	public static void main(String[] args) {
		Tester o1 = new Tester();
		reset(o1);
		System.out.print(o1.x);
	}
}

A 0

B 12

C Compilation error

D NullPointerException is thrown

E Another type of exception is thrown

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Explanation:

The variable is passed in Java by value not by reference. So it is not o1 that is assigned to null, rather the local variable obj in method reset, which was first assigned to the same value of o1 then to null.

In simple words:

calling method reset(o1) will make "obj", the local variable of method reset, refer to the same object "o1" refers to.

Inside method reset, "obj" will then be set to null (refers to nothing)

At this point only "obj" is affected not "o1", who still refers to the same object before calling reset(o1)

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