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Q:

What is difference between methods and blocks?

Answer

Method contains name, parameters, return type and executable body. But block does not contains name, parameters, return type.It contains only executable body.


Methods are executed by method call statements. Blocks are executed automatically with class loading and with object creation.

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Subject: Java

Q:

In a class if private data member is declared then how to get value of that data member?

Answer

By using method.


The method used to get the data is called getter method.

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Subject: Java

Q:

In a class if private data member is declared then how to set data to that private data member?

Answer

By using method.


The method used to set the data is called setter method.

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Subject: Java

Q:

What is the differnce among public, protected and package access data?

Answer

If we are not using packages and if we are not using inheritance then there is no difference among public, protected and package access data.

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Subject: Java

Q:

When this. non-static datamember is compulsory inside non-static method

Answer

Whenever there is local- variable/parameter inside the method with same name as data member.


Ex:


Class Sample {


 int a;


  void show() {


   int a=5;


   system.out.println(a); // 5


   system.out.println(this.a);//23


  }


}


class MainApp {


  Public static void main(String[] args) {


  Sample s = new Sample();


   s.a = 23;


   s.show();


   }


}


 

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Subject: Java

Q:

What is stored in the 'this' reference?

Answer

This is a keyword and used as reference to Current object address in java. 


It means by using which object the method is called that object hashcode is stored inside the 'this'.

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Subject: Java
Job Role: Analyst

Q:

Why static method can not call non static method of the same class?

Answer

bcoz the static method does not contains the 'this' reference.

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Subject: Java

Q:

How to assign address to the reference?

Answer

ClassName refName = new ClassName();


or


ClassName refName;


refName = new ClassName();

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Subject: Java