Java.lang Class Questions with Answers | Java Programming | Page 2

The Java.lang Class questions with answers topic is a key area in Java programming questions and answers asked in major technical exams and placement tests. The java.lang package forms the foundation of Java, offering essential classes like Object, String, and Math. Understanding these concepts is vital for cracking programming interview questions at companies like TCS, Infosys, and Accenture. In this section, we’ll explore frequently asked questions about java.lang classes, constructors, and methods with detailed explanations to help you master core Java fundamentals and boost your placement preparation.

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Q11

Which method is used to compare two objects for equality?

A equals()
B compare()
C ==
D equal()

Answer: Option A

Explanation: equals() method checks object equality

Q12

What is the parent class of all exception classes?

A Throwable
B Exception
C Error
D Object

Answer: Option A

Explanation: Throwable is the superclass of all errors and exceptions

Q13

Which class is used for string manipulation?

A String
B StringBuffer
C StringBuilder
D All of the above

Answer: Option D

Explanation: String class provides various methods for string operations

Q14

What does the clone() method do?

A Creates object copy
B Deletes object
C Compares objects
D Converts to string

Answer: Option A

Explanation: clone() creates and returns a copy of the object

Q15

Which method returns the runtime class of an object?

A getClass()
B getRuntimeClass()
C getType()
D classOf()

Answer: Option A

Explanation: getClass() returns the Class object representing runtime class

Q16

What is the purpose of the wait() method?

A Makes thread wait
B Stops program
C Terminates thread
D Pauses execution

Answer: Option A

Explanation: wait() causes current thread to wait until another thread notifies

Q17

Which class contains the Math.abs() method?

A Math
B Integer
C Number
D Object

Answer: Option A

Explanation: Math class provides static methods for mathematical operations

Q18

What is the default value of a boolean instance variable?

A false
B true
C 0
D null

Answer: Option A

Explanation: boolean instance variables are initialized to false by default

Q19

Which method is used to get the length of a string?

A length()
B size()
C getLength()
D getSize()

Answer: Option A

Explanation: length() method returns the number of characters in string

Q20

What is the superclass of Number class?

A Object
B Number
C Integer
D Math

Answer: Option A

Explanation: Number extends Object class directly

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Java - Java.lang Class Questions and Answers

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