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

From:
Shawn <shaw@nospam.com>
Newsgroups:
comp.lang.java.programmer
Date:
Wed, 13 Sep 2006 14:43:34 -0400
Message-ID:
<ee9jgn$4j5$1@news.nems.noaa.gov>
Shawn wrote:

Hi,

Could you provide me one more example to achieve the following effect in
Java? Thank you very much.

var a = [1,2,3];

    for (i=0; i<a.length; i++)
    {
        a[i] = a[i] * 2;
    }

    for (i=0; i<a.length; i++)
    {
        alert(a[i]);
    }
Doing something to every element of an array is pretty common, and you
can write a function that does it for you:

    function map(fn, a)
    {
        for (i = 0; i < a.length; i++)
        {
            a[i] = fn(a[i]);
        }
    }
Now you can rewrite the code above as:

    map( function(x){return x*2;}, a );
    map( alert, a );


Sorry. I try to do it myself. If anything wrong, please point it out for
me. Thank you.

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

class Test {

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

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

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

  void test() {
    int[] a={2, 4, 6, 8};
    doSomethingToArray(squareArray, a);
    doSomethingToArray(printArray, a);
  }

} //end of class Test

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