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Java MCQs - 10

  1. What is the output of the following code?
System.out.println("Java".substring(1, 3)); 

A) Jav
B) av
C) ava
D) Compiler error

Answer: C) ava

  1. Which of the following is true about Java inheritance?

A) Java supports multiple inheritance.
B) Inheritance allows a class to inherit from multiple classes.
C) Private members of the superclass are accessible in the subclass.
D) In Java, every class must inherit from a superclass.

Answer: C) Private members of the superclass are accessible in the subclass.

  1. What is the output of the following code?
System.out.println(Math.ceil(5.2)); 

A) 5
B) 6
C) 5.2
D) Compiler error

Answer: B) 6

  1. In Java, which keyword is used to create an instance of a class?

A) new
B) instance
C) create
D) object

Answer: A) new

  1. What is the output of the following code?
System.out.println("Java".indexOf("v")); 

A) 1
B) 2
C) 3
D) Compiler error

Answer: B) 2

  1. Which of the following statements about Java exceptions is true?

A) Checked exceptions are subclasses of RuntimeException.
B) Unchecked exceptions must be handled by the programmer.
C) finally block is not executed if an exception occurs.
D) throws keyword is used to handle exceptions.

Answer: A) Checked exceptions are subclasses of RuntimeException.

  1. What is the output of the following code?
System.out.println("Java".replace('a', 'i')); 

A) Java
B) Jivi
C) Javai
D) Jivi

Answer: B) Jivi

  1. Which of the following is NOT a valid Java data type?

A) boolean
B) char
C) string
D) double

Answer: C) string

  1. What is the output of the following code?
System.out.println("Java".toUpperCase()); 

A) Java
B) java
C) JAVA
D) Compiler error

Answer: C) JAVA

  1. In Java, which keyword is used to define a subclass?

A) subclass
B) sub
C) extends
D) inherits

Answer: C) extends

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