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Q:

What do you understand by private, protected and public?

Answer

These are accessibility modifiers. Private is the most restrictive, while public is the least restrictive. There is no real difference between protected and the default type (also known as package protected) within the context of the same package, however the protected keyword allows visibility to a derived class in a different package.

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Subject: Java

Q:

I don't want my class to be inherited by any other class. What should i do?

Answer

You should declared your class as final. But you can't define your class as final, if it is an abstract class. A class declared as final can't be extended by any other class.

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Subject: Java

Q:

What is the impact of declaring a method as final?

Answer

A method declared as final can't be overridden. A sub-class can't have the same method signature with a different implementation.

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Subject: Java

Q:

What is a package?

Answer

Package is a collection of related classes and interfaces. package declaration should be first statement in a java class.

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Subject: Java

Q:

What is difference between Path and Classpath?

Answer

Path and Classpath are operating system level environment variales. Path is used define where the system can find the executables(.exe) files and classpath is used to specify the location .class files.

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Subject: Java

Q:

What is Thread ?

Answer

A thread is a lightweight subprocess, a smallest unit of processing. It is a separate path of execution. It shares the memory area of process.



As shown in the above figure, thread is executed inside the process. There is context-switching between the threads. There can be multiple processes inside the OS and one process can have multiple threads.

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Subject: Java

Q:

What is the difference between creating a thread by extending Thread class and by implementing Runnable interface? Which one should prefer?

Answer

When creating a thread by extending the Thread class, it is not mandatory to override the run method (If we are not overriding the run method , it is useless), because Thread class have already given a default implementation for run method. But if we are implementing Runnable , it is mandatory to override the run method. The preferred way to create a thread is by implementing Runnable interface, because it give loose coupling.

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Subject: Java

Q:

What are the the different ways for creating a thread?

Answer

A thread can be created by subclassing Thread, or by implementing the Runnable interface.

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Subject: Java