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Submitted by heartin on Fri, 10/09/2015 - 20:23

QID:

Type:

Descriptive Question

Category:

Java Programmer I

Tags:

operators

operands

Validated against:

java8

Question:

Predict output:

public class PrefixPostfixCheck {

	public static void main(String[] args) {
		int i=5;
		i=i++;
		System.out.println(i);
	}
}

Reference:

http://javajee.com/prefix-and-postfix-operators-in-java

Answer and Explanation (Click to expand)

Answer:

This will print 5.

Explanation:

For any two variables a and b,

b = a++ expands to

temp = a;
a = a + 1;
b = temp;

Therefore, a = a++ expands to:

temp = a;
a = a + 1;
a = temp;

So irrespective of the increment, a is assigned its original value as stored in temp.

Hence it is adviced not to use a single variable in more than one assignment.

Refer to the reference link from javajee for all such expansion.

Q&A Set:

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