InnerClass vs. Anonymous vs. Lambda..., Java

InnerClass vs. Anonymous vs. Lambda...

//'main' method must be in a class 'Rextester'.
//Compiler version 1.8.0_111

import java.util.*;
import java.lang.*;

/*
    yagami rayleigh!!!
    
    ila baghi tefham shi 7aja shouf f blasa okhra,
    amma hnaya rah ghi moulinex...
*/
class Rextester
{  
    public static void main(String args[])
    {
        try {
            I i = new Rextester().innerClassWrapper(Art.InnerClass);
            i.m();

i = new Rextester().innerClassWrapper(Art.Anonym);
            i.m();

i = new Rextester().innerClassWrapper(Art.Lambda);
            i.m();

i = new Rextester().innerClassWrapper(null);
            i.m();
        }
        catch(ArgEmpty e) {
            System.out.println(e.getError());
        }
        
    }
    
    interface I {
        void m();
    }
    
    class C {
    }
    
    public enum Art {
        InnerClass, Lambda, Anonym;
    }
    
    class ArgEmpty extends Exception{
        private static final long serialVersionUID = 7718828512567893558L;
        private String message;
        
        ArgEmpty(String message) {
            this.message = message;
        }
        
        String getError() {return message;}
    }
    
    public I innerClassWrapper(Art art) throws ArgEmpty {
        if(art == null) throw new ArgEmpty(">>> Arg-empty execption!");
        
        class IC implements I {
            public void m() {
                System.out.println("InnerClass...");
            }
        }
        
        switch(art) {
            case InnerClass: return new IC();
        
            case Anonym:
                return new I() {
                    public void m() {
                        System.out.println("Anonym...");
                    }
                };
        
            case Lambda: return (() -> {System.out.println("Lambda...");});
        
            default: return null;
        }
    }
}


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