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Java String Basics

Here are 10 essential multiple-choice questions on Java String Basics, covering key concepts.

Last Updated : Mar 27, 2025

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Question 1

What is the correct way to declare a String in Java?

A
String str = 'Hello';
B
String str = new String("Hello");
C
String str = String("Hello");
D
String str = Hello;

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Question 2

Why are Strings immutable in Java?

A
To improve performance
B
To allow modifications in-place
C
To ensure thread safety and security
D
Because Java does not support mutable objects

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Question 3

What will be the output of the following code?

Java

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

A
true
B
false
C
Compilation Error
D
Runtime Exception

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Question 4

What will be the output of the following code?

Java

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

A
true
B
false
C
Compilation Error
D
Runtime Exception

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Question 5

Which method is used to concatenate two Strings in Java?

A
combine()
B
merge()
C
concat()
D
append()

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Question 6

What will be the output of the following code?

Java

String s = "Hello";
s.concat(" World");
System.out.println(s);

A
Hello World
B
Hello
C
World
D
Compilation Error

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Question 7

How can you make String mutable in Java?

A
Using StringBuilder or StringBuffer
B
Using final keyword
C
By modifying the existing String object
D
By using String.concat()

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Question 8

What will be the output of the following code?

Java

String s1 = "Hello";
String s2 = s1.concat(" World");
System.out.println(s2);

A
Hello
B
World
C
Hello World
D
Compilation Error

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Question 9

How does the intern() method affect Strings in Java?

A
It removes duplicate Strings from memory
B
It ensures that the String is stored in the String Pool
C
It modifies the original String
D
It converts the String into a StringBuffer

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Question 10

What is the advantage of using String over StringBuilder in multi-threaded applications?

A
String is faster than StringBuilder
B
String is synchronized
C
String is immutable and therefore thread-safe
D
String can be modified in place

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Java Quiz

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