Function within a function in Java [duplicate]

Question

Is it possible to define a function within a function in Java? I am trying to do something like:

public static boolean fun1() {   static void fun2()   {      body of function.   }   fun();   return returnValue; } 

but I am getting error Illegal start of expression.

Answer 1

The reason you cannot do this is that functions must be methods attached to a class. Unlike JavaScript and similar languages, functions are not a data type. There is a movement to make them into one to support closures in Java (hopefully in Java 8), but as of Java 6 and 7, it's not supported. If you wanted to do something similar, you could do this:

interface MyFun {     void fun2(); }  public static boolean fun1() {   MyFun fun2 = new MyFun() {       public void fun2() {           //....       }   };   fun2.fun2();   return returnValue; }