Encapsulation
Java allows a class within another class (nested classes).
/**
* Nested classes increases encapsulation.
* They can lead to more readable and maintainable code.
*/
package com.minte9.oop.nested_classes;
public class Encapsulation {
public static void main(String[] args) {
System.out.println(
OuterClass.InnerClass.y // 20
);
}
}
class OuterClass {
int x = 10;
static class InnerClass {
static int y = 20;
}
}
Static
The nested classes are the only classes that can be declare static.
/**
* Only nested classes can be declared as static classes.
* Inner classes can use fields from outer class.
*/
package com.minte9.oop.nested_classes;
public class Static {
public static void main(String[] args) {
A.B.run(); // 10
}
static class A {
static int a = 10;
static class B {
public static void run() {
System.out.println(a); // field from Outer Class
}
}
}
}
Last update: 595 days ago
