Local inner class can have a constructor : Nested Classes « Class Definition « Java Tutorial

interface Counter {
  int next();

public class MainClass{
  private int count = 0;
  Counter getCounter(final String name) {
    // A local inner class:
    class LocalCounter implements Counter {
      public LocalCounter() {
        // Local inner class can have a constructor
      public int next() {
        System.out.print(name); // Access local final
        return count++;
    return new LocalCounter();

  public static void main(String[] args) {
    MainClass lic = new MainClass();
    Counter c1 = lic.getCounter("Local inner ");

5.14.Nested Classes
5.14.1.Creating instances of inner classes
5.14.2.Nested Classes
5.14.3.Creating a new nested object outside
5.14.4.Static Nested Classes
5.14.5.Creating inner classes
5.14.6.Defining references to inner classes
5.14.7.Nesting a class within a method
5.14.8.Nesting a class within a scope.
5.14.9.Nested classes (static inner classes)
5.14.10.An inner class cannot be overriden like a method
5.14.11.Two ways that a class can implement multiple interfaces
5.14.12.Nested classes can access all members of all levels of the classes they are nested within
5.14.13.Proper inheritance of an inner class.
5.14.14.Using inner classes for callbacks
5.14.15.Returning a reference to an inner class
5.14.16.Putting test code in a nested class
5.14.17.With concrete or abstract classes, inner classes are the only way to produce the effect of multiple implementation inheritance.
5.14.18.Local inner class can have a constructor