Java - Classes and Objects
Why does calling a method on a null object cause a NullPointerException in Java?
Why does calling a method on a null object cause a NullPointerException in Java?
hard📝 Conceptual Q10 of 15
Step-by-Step Solution
Solution:
Step 1: Understand null references
A null reference means no object exists at that memory location.Step 2: Explain exception cause
Calling a method on null tries to access memory that doesn't exist, causing NullPointerException.Final Answer:
Because the object reference points to no actual object in memory -> Option AQuick Check:
Null reference = no object = exception [OK]
Quick Trick: Null means no object; calling methods causes error [OK]
Common Mistakes:
- Confusing method visibility with null errors
- Thinking abstract classes cause NullPointerException
- Assuming static methods cause null errors
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