Elements of a List or Array and ListEnumeration to List object in Java

How to fill or replace elements of a List or Array List

package com.java2novice.collections;

import java.util.ArrayList;

import java.util.Collections;

import java.util.List;

public class MyListFill

{

public static void main(String a[])

{

        List ll = new ArrayList();

        ll.add("one");

        ll.add("two");

        ll.add("three");

        ll.add("four");

        System.out.println("Original List: "+ll);

        Collections.fill(ll, "Temp_string");

        System.out.println("After fill: "+ll);

    }

}

How to find repeated element cound (frequency) of a given collection

package com.java2novice.collections;

import java.util.ArrayList;

import java.util.Collections;

import java.util.List;

public class MyListFrequency

{

public static void main(String a[])

{

        List ll = new ArrayList();

        ll.add("one");

        ll.add("two");

        ll.add("three");

        ll.add("four");

        ll.add("two");

        ll.add("three");

        ll.add("two");

        ll.add("one");

        System.out.println("Actual list: "+ll);

        System.out.println("Frequency of 'one': "+Collections.frequency(ll, "one"));

        System.out.println("Frequency of 'three': "+Collections.frequency(ll, "three"));

        System.out.println("Frequency of 'two': "+Collections.frequency(ll, "two"));

    }

}

How to convert Enumeration to List object

package com.java2novice.collections;

import java.util.Collections;

import java.util.Enumeration;

import java.util.List;

import java.util.Vector;

public class MyEnumerationToList

{

public static void main(String a[])

{

        Vector vct = new Vector();

        vct.add("one");

        vct.add("two");

        vct.add("three");

        vct.add("four");

        vct.add("five");

        Enumeration enm = vct.elements();

        List ll = Collections.list(enm);

        System.out.println("List elements: "+ll);

    }

}