What will be the output of this code?

medium📝 Predict Output Q4 of 15

Java - Wrapper Classes

Integer a = 1000; Integer b = 1000; System.out.println(a == b);

Afalse

BRuntime exception

CCompilation error

Dtrue

Step-by-Step Solution

Solution:

Step 1: Understand '==' with wrapper objects
Using '==' compares object references, not values, for wrapper objects.
Step 2: Integer caching range
Integer caches values from -128 to 127. 1000 is outside this range, so a and b refer to different objects.
Final Answer:
false -> Option A
Quick Check:
'==' compares references, 1000 not cached = false [OK]

Quick Trick: Use equals() to compare wrapper values, not '==' [OK]

Common Mistakes:

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