Java String MCQs That Every Developer Should Know 🔥

Advanced Java String Theory MCQs 🔥

1. Why are Strings immutable in Java?

Options:

A) To reduce Heap memory usage
B) To improve security, caching, and thread safety
C) To allow modification of String Pool objects
D) To make Strings faster than arrays

✅ Answer: B) To improve security, caching, and thread safety

Explanation:
Immutability enables String Pool optimization, makes Strings inherently thread-safe, and prevents security issues (e.g., changing database URLs, file paths after validation).

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2. What is the main difference between String, StringBuilder, and StringBuffer?

Options:

A) All three are mutable.
B) String is mutable, while the others are immutable.
C) StringBuilder is thread-safe, but StringBuffer is not.
D) String is immutable, StringBuilder is mutable and non-thread-safe, and StringBuffer is mutable and thread-safe.

✅ Answer: D) String is immutable, StringBuilder is mutable and non-thread-safe, and StringBuffer is mutable and thread-safe.

Explanation:
Use StringBuilder for better performance in single-threaded environments and StringBuffer when synchronization is required.

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3. What is the purpose of the String Constant Pool?

Options:

A) To store all Java objects.
B) To improve memory efficiency by reusing String literals.
C) To store primitive data types.
D) To manage Garbage Collection.

✅ Answer: B) To improve memory efficiency by reusing String literals.

Explanation:
The String Pool avoids creating duplicate String literal objects, reducing memory consumption and improving performance.

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Java String MCQs That Every Developer Should Know 🔥
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