Anonymous Classes Implementing An Interface Issue

[Ehsan Rahman]

Hi Everyone,

Hope you are having a good day/night. Stumbled upon another anonymouse class issue:

  

public class Main {

    InterfaceA A = new InterfaceA(){
        public void method(){
        }
    };

    InterfaceA B;
    //Error below
//    B = new InterfaceA(){
//        public void method(){
//        }
//    };

}

public interface InterfaceA {
}

  

Please could someone explain why assignment to A works but the assignment to B (by not assigning immediately) doesn't work.

Many Thanks,
Ehsan

[Chad Cook]

What error message(s) are you receiving?

[Ehsan Rahman]

When compiling:

  public class Main {

    InterfaceA A = new InterfaceA(){
        public void method(){
        }
    };

    InterfaceA B;
    //Error below
    B = new InterfaceA(){
        public void method(){
        }
    };

}  

The following compiler error message appears:

  Main.java:13: <identifier> expected
    B = new InterfaceA(){
     ^
1 error  

[Ulf Dittmer]

You can't have code (like an assignment) outside of methods, unless they're part of a field declaration, or in a static initializer.