Re: Can a method be a parameter of another method in Java?

/*
For testing passing a method as a method parameter
*/

interface Mapper {
   void map(int[] d);
}

class Demo {
         void doSomethingToArray(Mapper m, int[] aArray) {
                 m.map(aArray);
         } //end of method doSomethingToArray

         Mapper squareArray = new Mapper() {
                 public void map(int[] a)
                 {
                         for (int i=0; i<a.length; i++)
                         {
                                 a[i] *= a[i];
                         }
                 }
         };

         Mapper printArray = new Mapper() {
                 public void map(int[] a)
                 {
                         for (int i=0; i<a.length; i++)
                         {
                                 System.out.println(a[i]);
                         }
                 }
         };

         private int[] a = new int[3];

         public static void main(String[] args)
         {
          Demo aDemo = new Demo();
          aDemo.a[0] = 1;
          aDemo.a[1] = 2;
          aDemo.a[2] = 3;
         
          aDemo.doSomethingToArray(aDemo.printArray, aDemo.a);
                 aDemo.doSomethingToArray(aDemo.squareArray, aDemo.a);
                 aDemo.doSomethingToArray(aDemo.printArray, aDemo.a);
         }

} //end of class Demo