Java Interview Questions and Answers for Experienced Pdf - 1
What is a Java Virtual Machine?
A Java Virtual Machine is a runtime environment required for execution of a Java application.
Each Java application runs inside a runtime instance of some concrete implementation of abstract specifications of JVM.
It is JVM which is crux of platform independent nature of the language.
Why java does not support pointers?
Because pointers are unsafe, Java uses reference types to hide pointer and programmers feel easier to deal with reference types without pointers.
What is encapsulation?
Encapsulation is the mechanism that binds together code and data it manipulates and keeps both safe from outside interference and misuse.
What is polymorphism?
Polymorphism is the feature that allows one interface to be used for general class actions.
Polymorphism is the feature of OOPs. One interfaces multiple implementations.
Designing a generic interface for a group of related activities.
This helps reduce. Complexity by allowing the same interface to be used to specify a general class of action.
Polymorphism is achieved in a class by method overloading.
Run time Polymorphism is achieved in a class hierarchy by method overriding.
What is the purpose of the runtime class?
The purpose of the Runtime class is to provide access to the Java runtime system.
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