Object reference is not initialized as null in JAVA

Question

According to rule in JAVA if object reference is declared but not initialized then JAVA initializes it by null. So why is this error is occuring in my code ? Plaese help me out.

Main.java:28: error: variable obj might not have been initialized
        if(obj==null)
           ^

class c {
    int age=12;
    c variable123;
}
public class A {
    c obj;
    if (obj==null) System.out.println(obj);
}

9ilsdx 9rvj 0lo · Accepted Answer · 2021-10-14T07:38:51.200

3

You've misread the documentation. The class (non-final) variables are initialized with null values, the local values are not initialized and cause compiler error.

See https://docs.oracle.com/javase/specs/jls/se17/html/jls-16.html for details.

edited Oct 14 '21 at 07:38

answered Oct 14 '21 at 07:13

9ilsdx 9rvj 0lo

7,955
10
38
77

3

In particular, from the [JLS](https://docs.oracle.com/javase/specs/jls/se17/html/jls-16.html) *"For every access of a local variable or blank `final` field `x`, `x` must be definitely assigned before the access, or a compile-time error occurs."* – Federico klez Culloca Oct 14 '21 at 07:17
Oh, I got it. Class `varible (variable123)` will be initialized to null by JAVA, while `obj` will not. Thanks @Federico klez Culloca and @9ilsdx 9rvj 0lo. – het99 Oct 14 '21 at 09:46

Object reference is not initialized as null in JAVA

1 Answers1