why we need nested classes in java

Nested classes in java

// anonymous inner class as method argument.
interface HelloWorld
{
   String print();
}
public class AnonymousInnerDemo
{
   // method accepts object of interface HelloWorld
   public void display(HelloWorld m)
   {
      System.out.println(m.print() + "example of anonymous inner class as method argument.");
   }
   public static void main(String[] args)
   {
      AnonymousInnerDemo obj = new AnonymousInnerDemo();
      // pass an anonymous inner class as an argument
      obj.display(new HelloWorld() {
         public String print() {
            return "Hi! ";
         }
      });
   }
}

Posted by: Guest on November-23-2020

Source

// anonymous inner class as method argument. interface HelloWorld { String print(); } public class AnonymousInnerDemo { // method accepts object of interface HelloWorld public void display(HelloWorld m) { System.out.println(m.print() + "example of anonymous inner class as method argument."); } public static void main(String[] args) { AnonymousInnerDemo obj = new AnonymousInnerDemo(); // pass an anonymous inner class as an argument obj.display(new HelloWorld() { public String print() { return "Hi! "; } }); } }

// example on static nested classes java import java.util.*; public class OuterClass { static class NestedClass { public void display() { System.out.println("static nested class example"); } } public static void main(String[] args) { OuterClass.NestedClass nested = new OuterClass.NestedClass(); nested.display(); } }

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