Java new long(0)

Question

In my class I have this parameter:

public Long label_id ;

When I try to evaluate the value from label_id which is 0

if(item.label_id == new Long(0)) {
    Doesn't enter here
} else {
    Enters here
}

It is supposed to enter the condition since both are zero but it enters the else condition. I even tried debugging the code:

label_id    Long  (id=142)  
    value 0

Am I missing something here?

Answer 1

You should extract the value of label_id first and then compare it:

if(item.label_id.longValue() == 0L)

Answer 2

You are using an object comparison. and with new ... you generate a new object. the both objects are not the same... You can use new Long(0).equals(...)