Java Inteview Question (Medium)

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Which keyword in Java is used to point to the current instance of a method or a constructor?

object

this (correct)

super

instance

What is the method of calling one constructor of a class using another constructor of the same class called?

Constructor chaining (correct)

Method overloading

Method overriding

Inheritance

What is the actual superclass of all the classes in Java?

Object class (correct)

Base class

Parent class

Super class

Why are pointers not supported in Java?

To achieve security by abstraction Signup and view all the answers

Which type of inheritance involves multiple child classes inheriting properties from multiple parent classes?

Multi-level inheritance Signup and view all the answers

What is the term for creating and implementing a method with the same name in a subclass as the parent class?

Method overriding Signup and view all the answers

What are the limitations of inheritance?

All of the above. Signup and view all the answers

Why does Java not support multiple inheritances?

It creates complexities like the diamond problem. Signup and view all the answers

Which type of constructor is created by the compiler when no constructor is defined in the program?

Default constructor Signup and view all the answers

Can a constructor be invoked by a subclass?

Yes Signup and view all the answers

What is the difference between constructors and methods?

Constructors are invoked when a class is instantiated, while methods are invoked to perform actions on objects Signup and view all the answers

What is the purpose of a wrapper class in Java?

To include primitive data types in the family of objects Signup and view all the answers

Ques.1. What is Java?

Java is a programming language developed in 1995 by Sun Microsystems. Signup and view all the answers

Ques.2. What are some features of Java?

Java can perform various tasks simultaneously. Signup and view all the answers

Ques.3. What is JDK?

JDK includes all the development tools required to develop a program. Signup and view all the answers

Ques.4. What is Javac?

Javac is a compiler used in Java to convert program code into bytecodes. Signup and view all the answers

Which one of the following is true about String objects in Java?

String objects cannot be modified once created Signup and view all the answers

What is the purpose of making String final in Java?

To maintain the immutability of String objects Signup and view all the answers

What is the difference between the == operator and the .equals() method when comparing strings in Java?

The == operator compares memory references, while .equals() compares object values Signup and view all the answers

What is the purpose of inheritance in object-oriented programming?

To acquire properties of a parent class in a child class Signup and view all the answers

Which of the following is true about the JVM?

The JVM is the interpreter for the Java programming language. Signup and view all the answers

Why is Java considered platform-independent?

Java code is compiled into an intermediate language called bytecode. Signup and view all the answers

What is the purpose of the Just In Time (JIT) compiler?

To enhance the performance of the application. Signup and view all the answers

What are the different access modifiers in Java?

Default, Private, Protected, Public Signup and view all the answers

Which method can be declared final?

main() method Signup and view all the answers

Can an interface be declared final?

No Signup and view all the answers

What is static binding?

Identifying classes and objects during compile time Signup and view all the answers

What is dynamic binding?

Identifying classes and objects during run time Signup and view all the answers

What does the instanceof operator do?

Checks if the object is an instance of a specific class or subclass Signup and view all the answers

What is a multithreaded program?

A program that uses multiple threads to execute tasks simultaneously Signup and view all the answers