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Java Interview Questions with 100% Correct Answers
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Java Interview Questions with 100% Correct Answers
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©PREP4EXAMS@2024 [REAL EXAM DUMPS] Thursday, July 25, 2024 12:43 PMJava Interview Questions with 100% Correct Answers
How to delete a character in a String - ✔️✔️Because Strings in Java are immutable. You'll have to
create a new string removing the character you don't want.
String newstr = str.substring(0, idx) + str.substring(idx + 1);
public String removeChar(String str, Integer n) {
String front = str.substring(0, n);
String back = str.substring(n+1, str.length());
return front + back;
}
What is Object Oriented Programming - ✔️✔️Object-oriented programming (OOP) is a
programming language model organized around objects rather than "actions" and data rather than
logic.
The first step in OOP is to identify all the objects the programmer wants to manipulate and how
they relate to each other, an exercise often known as data modeling.
What are be benefits of Object-Oriented Programming - ✔️✔️Improved code reuse.
Improved software maintainability.
Faster development.
4 major principles that make a
language object-oriented. - ✔️✔️Encapsulation, Data Abstraction, Polymorphism and Inheritence.
Describe the software development lifecycle - ✔️✔️Communication, System concept
development,
What is multithreading? - ✔️✔️Multithreading is a process of executing multiple threads
simultaneously. Its main advantage is:
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, ©PREP4EXAMS@2024 [REAL EXAM DUMPS] Thursday, July 25, 2024 12:43 PM
Threads share the same address space.
Thread is lightweight.
Cost of communication between process is low.
What is thread? - ✔️✔️A thread is a lightweight subprocess.It is a separate path of execution.It is
called separate path of execution because each thread runs in a separate stack frame.
What is difference between JDK,JRE and JVM? - ✔️✔️JVM is an acronym for Java Virtual
Machine, it is an abstract machine which provides the runtime environment in which java
bytecode can be executed. It is a specification.
JRE stands for Java Runtime Environment. It is the implementation of JVM.
JDK is an acronym for Java Development Kit. It physically exists. It contains JRE +
development tools.
How many types of memory areas are allocated by JVM? - ✔️✔️Class(Method) Area
Heap
Stack
Program Counter Register
Native Method Stack
What is the main difference between Java platform and other platforms? - ✔️✔️The Java platform
differs from most other platforms in the sense that it's a software-based platform that runs on top
of other hardware-based platforms.It has two components:
Runtime Environment
API(Application Programming Interface)
What gives Java its 'write once and run anywhere' nature? - ✔️✔️The bytecode. Java is compiled
to be a byte code which is the intermediate language between source code and machine code.
This byte code is not platform specific and hence can be fed to any platform.
What is classloader? - ✔️✔️The classloader is a subsystem of JVM that is used to load classes and
interfaces.There are many types of classloaders e.g. Bootstrap classloader, Extension classloader,
System classloader, Plugin classloader etc.
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