What do you mean by encasulation and examples in java?

Answer 1

I suppose you mean "encapsulation". It basically refers to "information hiding". That is, in a class, the details of how information is stored is hidden from the outside.

Here is a typical example in Java:

class Person {

private int age;

public int getAge() {return age;}

public void setAge(int parameterAge) {age = parameterAge;}

}

Note that the field (or variable) "age" is declared as "private"; that means that it can't be accessed directly from the outside, and the programmer of this class is free to change the way the information is stored at any moment, without breaking compatibility with any code that uses the class. Access to the information is via the public "get" and "set" methods; the signature of these methods should not change.