Inner class means one class that is a member of another class. There are basically four types of inner classes in java.
- Nested Inner class
- Method Local inner classes
- Anonymous inner classes
- Static nested classes
Java also allows a class to be defined within another class. These are called Nested Classes. The class in which the nested class is defined is known as the Outer Class. Unlike top-level classes, Inner classes can be Static. Non-static nested classes are also known as Inner classes. In this article, we will implement a static inner class in java programs.
Example 1: An Instance of the static inner class is created and its method is called later.
Java
// Java Program to Illustrates Use of Static Inner Class // Outer classpublic class Gfg { // Display message of inner class static String msg = "GeeksForGeeks"; // Static Inner Class static class InnerClass { // Static Inner Class Method public void display() { // Display message of inner class System.out.println("Welcome to " + msg); } } // Main driver method public static void main(String[] args) { // Creating an instance of the static inner class InnerClass instance = new InnerClass(); // Calling method display through // the inner class instance variable instance.display(); }} |
Output:
Welcome to GeeksForGeeks
Example 2: Creating an instance of the outer class and calling the static inner class method.
Java
// Java Program to Illustrates Use of Static Inner Class // Outer classpublic class GFG { // Static string message static String msg = "GeeksForGeeks"; // Static Inner Class static class InnerClass { // Static Inner Class Method public void display() { // Display message in inner class System.out.println("Welcome to " + msg); } } // Main driver method public static void main(String[] args) { // Creating an instance of the outer class Gfg.InnerClass instance = new Gfg.InnerClass(); // Calling method of static inner class through // the outer class instance variable instance.display(); }} |
Output:
Welcome to GeeksForGeeks
