[Solved] Find the problem in this code:String s1 = "Java"; String s2; s2 = s1; s1 = null; System.out.println(s2.length()); | Java

Java - Memory Management Basics

Find the problem in this code:

String s1 = "Java";
String s2;
s2 = s1;
s1 = null;
System.out.println(s2.length());

ACompilation error due to uninitialized s2

BPrints 4 without error

CNullPointerException at runtime

Ds2 becomes null after s1 is null

Step-by-Step Solution

Solution:

Step 1: Assign references
s2 is assigned to point to the same String object as s1 ("Java").
Step 2: Nullify s1 and print s2 length
Setting s1 to null does not affect s2, which still points to "Java". Calling length() on s2 returns 4.
Final Answer:
Prints 4 without error -> Option B
Quick Check:
Nullifying one reference doesn't affect others [OK]

Quick Trick: Null one reference, others still valid if pointing same object [OK]

Common Mistakes:

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