Here we will discuss Why We Use Nested Classes In Java? where the nested class is used for increasing the encapsulation and increase the readability of code or program. And as we know that to declare the class as static we need to have the class as a nested class.
Nested Class
Nested classes are the class inside the class where we use nested class to give it as static so that we can use the encapsulation and make use of data hiding which help in increasing readability.
The nested class can be defined as both static and non static.
To see how we can initialize the nested class and make use of it to declare it as static follow the example given below.
public class Enclosing {
private static int x = 1;
public static class StaticNested {
private void run() {
// method implementation
}
}
@Test
public void test() {
Enclosing.StaticNested nested = new Enclosing.StaticNested();
nested.run();
}
}
Here we can see how an outer class enclosing is having an inner class staticNested class which is static by nature and used for declaring a private method inside an inner static class which means it is purely static.
Whereas a nested static class can not have all the access modifiers there are limited access modifiers that could be used in static classes.
In fact, the inner class of a nested class can be non static also where the member of the class can have any access modifiers
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