Core Java Interview Questions Set 1
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Questions and Answers

What characteristics make Java a platform-independent programming language?

  • Java is compiled into machine code.
  • Java requires hardware-specific compilers.
  • Java uses the Java Virtual Machine. (correct)
  • Java is an interpreted language only.
  • Which of the following best describes the role of the Java Virtual Machine (JVM)?

  • It manages memory for Java applications.
  • It translates Java bytecode into human-readable code.
  • It compiles Java code into machine code.
  • It provides a runtime environment for executing Java programs. (correct)
  • What is the primary function of the Java Runtime Environment (JRE)?

  • To provide a development environment for Java applications.
  • To execute Java bytecode on the host machine. (correct)
  • To manage various Java libraries and dependencies.
  • To compile Java programs into bytecode.
  • Which of the following statements about JDK, JRE, and JVM is true?

    <p>JVM is a runtime instance created when Java code is executed.</p> Signup and view all the answers

    Who developed the Java programming language?

    <p>James Gosling</p> Signup and view all the answers

    Which of the following is NOT a feature of the Java programming language?

    <p>Machine-specific</p> Signup and view all the answers

    What is the main purpose of compiling Java code into bytecode?

    <p>To allow the Java program to run on any hardware platform.</p> Signup and view all the answers

    What happens when a Java program is executed?

    <p>A Java Virtual Machine creates a runtime instance for execution.</p> Signup and view all the answers

    What is the primary function of the Just-In-Time (JIT) compiler in Java?

    <p>To compile bytecode for faster execution based on functionality.</p> Signup and view all the answers

    Which components are included in the Java Development Kit (JDK)?

    <p>JRE and development tools.</p> Signup and view all the answers

    What characterizes the bytecode generated by Java programs?

    <p>It is an intermediate language that can be executed on any machine.</p> Signup and view all the answers

    What is the role of a classloader in Java?

    <p>To load class files into memory at runtime.</p> Signup and view all the answers

    What result occurs if no arguments are provided at the command line for the main() method?

    <p>The String array will be empty.</p> Signup and view all the answers

    What types of platforms does Java provide?

    <p>Only software-based platforms.</p> Signup and view all the answers

    Which of the following statements about source file names in Java is true?

    <p>Files must end with .java and can be named anything valid.</p> Signup and view all the answers

    Which of the following best describes the nature of JVM's memory area allocation?

    <p>JVM allocates different types of memory areas for various purposes.</p> Signup and view all the answers

    Study Notes

    Core Java Interview Questions Overview

    • A collection of 300 core Java interview questions, providing a 90% assurance of frequently asked questions in interviews.
    • Categories include Basics, OOP, String Handling, Multithreading, Collections, and JDBC.

    Java Fundamentals

    • Java is a high-level, object-oriented, secure, and robust programming language that is platform-independent and multithreaded.
    • Developed by James Gosling in June 1991, it includes its own Java Runtime Environment (JRE) and Application Programming Interface (API).

    Key Differences

    • Differences between C++ and Java include syntax, memory management, and inheritance models.

    Java Language Features

    • Java offers features such as portability, automatic memory management (garbage collection), and strong type checking.

    Java Virtual Machine (JVM)

    • JVM is a runtime engine that allows execution of Java bytecode, acting as an abstract machine.
    • Compiles Java source code to bytecode, which is platform-independent.
    • JVM has specifications, implementations, and instances, with physical existence provided by JRE.

    Java Development Kit (JDK) and Java Runtime Environment (JRE)

    • JRE is the implementation of JVM, containing libraries and files for running Java applications.
    • JDK is a software development environment that includes JRE as well as development tools to create Java applications.

    JVM Memory Areas

    • JVM allocates various types of memory areas for its execution, enhancing performance and management.

    Just-In-Time (JIT) Compiler

    • JIT compiler enhances performance by compiling bytecode into native machine code at runtime, reducing compilation time.

    Platform Definition

    • In programming, a platform refers to the hardware or software underlying the execution of software. Java is classified as a software-based platform.

    Java's Portability

    • Java's "write once, run anywhere" capability stems from bytecode, which is an intermediate representation that can run on any machine with a JVM.

    Classloader

    • A subsystem of JVM that loads class files into memory for execution; includes built-in classloaders.

    Source File Naming Convention

    • Java source files must end with a .java extension, and can be compiled with javac and executed with java.

    Command Line Arguments

    • If no arguments are passed to the main() method, the String array is initialized as empty, not null.

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    Quiz Team

    Description

    This quiz presents a set of 300 core Java interview questions that aim to prepare you for job interviews. With a high assurance of 90% relevance, each question is short and categorized, ensuring clear and concise answers. Perfect for anyone looking to strengthen their Java knowledge for upcoming interviews.

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