Program: How to replace all occurances of a given object in the list?

Collections.replaceAll() method replaces all occurrences of one specified value in a list with another.

package com.java2novice.collections;

import java.util.ArrayList;
import java.util.Collections;
import java.util.List;

public class MyListReplaceAll {

	public static void main(String a[]){
		
		List<String> list = new ArrayList<String>();
		list.add("java");
		list.add("c");
		list.add("c++");
		list.add("unix");
		list.add("perl");
		list.add("php");
		list.add("javascript");
		list.add("ruby");
		list.add(".net");
		list.add("perl");
		list.add("c++");
		System.out.println(list);
		//replace perl with dum_dum
		Collections.replaceAll(list, "perl", "dum_dum");
		System.out.println(list);
	}
}

[java, c, c++, unix, perl, php, javascript, ruby, .net, perl, c++]
[java, c, c++, unix, dum_dum, php, javascript, ruby, .net, dum_dum, c++]