java Long datatype comparison

Question

Why does the code below return false for long3 == long2 comparison even though it\'s literal.

public class Strings {

    p         


        

Answer 1

Here Long is a Wrapper class so the below line will compare the reference not the content.

long3 == long2

its always better to compare with ** .longValue() ** like below

long3.longValue() == long2.longValue()

If we use in-build equal() method that also will do the same thing with null check.

long3.equals(long2)

Below is the internal implementation of equals() in java

public boolean equals(Object obj) {
    if (obj instanceof Long) {
        return value == ((Long)obj).longValue();
    }
    return false;
}