Anonymous inner class cannot have a named constructor, only an instance initializer : Anonymous inner class « Class Definition « Java Tutorial

1. Java Tutorial
2. Class Definition
3. Anonymous inner class

interface Counter {
  int next();
}

public class MainClass{
  
  private int count = 0;
  Counter getCounter(final String name) {
    return new Counter() {
      
      {
        System.out.println("Counter()");
      }
      public int next() {
        System.out.print(name); // Access local final
        return count++;
      }
    };
  }
  
  public static void main(String[] args) {
    MainClass lic = new MainClass();
    Counter c1 = lic.getCounter("Local inner ");
  }
}