Java.lang Class Questions with Answers | Java Programming | Page 3

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.

Showing 10 of 24 questions

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Q21

Which class is used for dynamic string manipulation?

A StringBuilder
B String
C StringBuffer
D Both StringBuilder and StringBuffer

Answer: Option D

Explanation: StringBuilder allows mutable sequence of characters

Q22

What does the instanceof operator check?

A Object type
B Object value
C Object size
D Object class

Answer: Option A

Explanation: instanceof checks if object is instance of specific class/interface

Q23

Which package contains the Object class?

A java.lang
B java.util
C java.io
D java.core

Answer: Option A

Explanation: Object class is in java.lang package

Q24

What is the purpose of the Class class?

A Runtime class information
B Object creation
C Memory management
D String operations

Answer: Option A

Explanation: Class objects represent classes and interfaces in running Java application

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