Why do you need a class in java?

Answer 1

A class, if designed properly, will provide a grouping of related data and common tasks. Rather than having arrays of primitives all over the place, classes allow us to keep various bits of associated information together.

A common example is a generic Person class...

Trying to keep a list of information about people together without classes will consist of several separate arrays of information:

String[] firstNames;

String[] lastNames;

int[] height;

int[] weight

Obviously, trying to keep these collections of data organized and synchronized will take a great deal of effort.

Compare that to using a Person class:

class Person {

String firstName;

String lastName;

int height;

int weight;

}

Then we only need to keep a single array up to date:

Person[] people;

Answer 2

A private inner or nested class in Java restricts, then access is restricted to the scope of that outer class. A private class may be useful to isolate some set of logic in a class but not allow it to be accessed outside of the outer class.

public class MyClass {

public void myMethod() {

InnerClass that = new InnerClass();

// ....

}

private static class InnerClass {

// ....

}

}

A top-level class is not allowed to be declared private since they would not be accessible by any other class. Only access modifiers on a top-level class are the following: public, final, or abstract.

Answer 3

It is an object-oriented programming language.

Answer 4

Not all classes are intended for public consumption; some are for internal use only.

Answer 5

becoz we need