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Java String Basics
Question 1
What is the correct way to declare a String in Java?
String str = 'Hello';
String str = new String("Hello");
String str = String("Hello");
String str = Hello;
Question 2
What will be the output of the following code?
String s1 = new String("Java"); String s2 = new String("Java"); System.out.println(s1 == s2);
true
false
Compilation Error
Runtime Exception
Question 3
How can you make String mutable in Java?
Using StringBuilder or StringBuffer
Using final keyword
By modifying the existing String object
By using String.concat()
Question 4
How does the intern() method affect Strings in Java?
It removes duplicate Strings from memory
It ensures that the String is stored in the String Pool
It modifies the original String
It converts the String into a StringBuffer
Question 5
What is the advantage of using String over StringBuilder in multi-threaded applications?
String is faster than StringBuilder
String is synchronized
String is immutable and therefore thread-safe
String can be modified in place
Question 7
Why are strings immutable in Java?
To enable multiple inheritance
To avoid garbage collection
For security and thread safety
All of the above
Question 9
Which of the following is a correct way to concatenate strings?
"Hello" + "World"
"Hello".concat("World")
Both a and b
Hello + World
Question 10
What happens when you concatenate two strings in Java?
A new object is created
The original string is changed
Compile-time error
JVM crashes
There are 10 questions to complete.