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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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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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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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