Core Java - Interview Questions and Answers for 'JDK' | Search Interview Question

Core Java - Interview Questions and Answers for 'JDK' - 7 question(s) found - Order By Newest

Q1. Difference between JVM, JRE and JDK ?

Ans. JDK(Java Development kit) = Development Kit comprising of JVM , library and development tools for developers

JRE (Java Run time Environment) - Comprise of JVM and set of libraries

JVM(Java Virtual Machine) = Interpreter which reads the .class file line by line.

When we install JDK, JRE also get installed so we can write,compile and excute our code. Used by developer. Without JDK we can only execute the program using JRE.

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Q2. what is covariant return type?

Core Java

Ans. co-variant return type states that return type of overriding method can be subtype of the return type declared in method of superclass. it has been introduced since jdk 1.5

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Q3. How can we change the JDK compliance level ?

Eclipse

Ans. Windows -> Preferences -> Java - Compiler -> Java Compliance Level

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Q4. What are the new classes in JDK 1.9 ( Java 9 ) ?

Ans. http://www.buggybread.com/2015/05/java-9-new-classes-and-interfaces-in.html

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All these acronyms JDK,JRE,JVM etc are very frequently asked.

Q5. Difference between JDK and JRE ?

Core Java

Ans. JRE or Java Runtime Environment is the Java Virtual Machine on which class files are executed. It includes borwser plugins that facilitates execution of class files in browsers.

JDK or Java Development Kit includes JRE , compiler and development tools.

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Q6. Is JDK required on each machine where a Java application needs to be run ?

Core Java

Ans. No, to run application, machine needs just a JRE (Java Runtime Environment)

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Q7. What is the purpose of JDP and JDK ?

Core Java

^{This question was recently asked at 'Dextrasys'.This question is still unanswered. Can you please provide an answer.}

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