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
