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

1. Java Tutorial
2. Class Definition
3. Nested Classes

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
        System.out.println("LocalCounter()");
      }
      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 ");
  }
}