Question

Lets say I have a concrete class Class1 and I am creating an anonymous class out of it.

Object a = new Class1(){         void someNewMethod(){         }       }; 

Now is there any way I could overload the constructor of this anonymous class. Like shown below

Object a = new Class1(){         void someNewMethod(){         }         public XXXXXXXX(int a){           super();           System.out.println(a);         }       }; 

With something at xxxxxxxx to name the constructor?

Answer 1

From the Java Language Specification, section 15.9.5.1:

An anonymous class cannot have an explicitly declared constructor.

Sorry 🙁

EDIT: As an alternative, you can create some final local variables, and/or include an instance initializer in the anonymous class. For example:

public class Test {     public static void main(String[] args) throws Exception {         final int fakeConstructorArg = 10;          Object a = new Object() {             {                 System.out.println('arg = ' + fakeConstructorArg);             }         };     } } 

It’s grotty, but it might just help you. Alternatively, use a proper nested class 🙂