lombok @ExtensionMethod sample2.

gistfile1.java

import lombok.experimental.ExtensionMethod;
@ExtensionMethod({ Extensions1.class, Extensions2.class })
public class Main {
    public static void main(String[] args) {
        System.out.println("test".addedMethod()); // => "test added method 1"
    }
}

class Extensions1 {
    public static String addedMethod(String value) {
        return value + " added method 1";
    }
}

class Extensions2 {
    public static String addedMethod(String value) {
        return value + " added method 2";
    }
}