java - How to call a method by the order of parameters in OOP? -

suppose have 4 classes a, b, c , container

and have following objects , how achieve following output adding code container class?

the first call "con" object should correspond the first parameter.

your answer appreciated !

a  = new a();     b  b = new b();     c  c = new c();  container  con = new container(a,b,c);  con.calling(); con.calling(); con.calling(); 

the expected output :

calling calling b calling c 

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public class {         public void calla() {         system.out.println("calling a");     } }  public class b {             public void callb() {         system.out.println("calling b");     } }  public class c {     public void callc() {         system.out.println("calling c");     } }  public class container {              public container(a a, b b, c c) {      }      public void calling(){      }     } 

looks similar iterator pattern/interface. here instead of calling() method next().

i can sketch you, like:

import java.util.arrays; import java.util.iterator;  public class container implements iterator {      private iterator<?> iter;      public container(object ...values) {         this.iter = arrays.aslist(values).iterator();     }      @override     public boolean hasnext() {         return iter.hasnext();     }      @override     public object next() {         return iter.next();     } } 

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update after scrutiny consideration on question, i've decided expand answer. decision above iterator give rough idea. want more specific decision, , here java-8 method references:

1) container runnable instances:

import java.util.arrays; import java.util.iterator;  public class container implements iterator {      private iterator<runnable> iter;      public container(runnable ...values) {         this.iter = arrays.aslist(values).iterator();     }      @override     public boolean hasnext() {         return iter.hasnext();     }      @override     public object next() {         runnable next = iter.next();         next.run();         return next;     } } 

and sample code test stuff:

container container = new container(new a()::calla, new b()::callb, new c()::callc);  container.next(); container.next(); container.next(); 

in case not return next instance, invoke desired method.