Java Proficiency: Remove All Element From Arraylist Example

Sunday 10 May 2015

Remove All Element From Arraylist Example

Method 1:

We can remove all element of arraylist using clear() method . clear() removes all element from the list and return empty list.

import java.util.ArrayList;

public class RemoveAll {

    public static void main(String[] args) {

        ArrayList<String> arr = new ArrayList<String>();

        // add element in arraylist
        arr.add("c");
        arr.add("c");
        arr.add("php");
        arr.add("html");
        arr.add("java");

        // print arraylist
        System.out.println("arrayList is = " + arr);

        /*
        * Removes all of the elements from this list.
        */
        arr.clear();

        System.out.println("After Clear arrayList is="+arr);
    }

}

Output:

arrayList is = [c, c, php, html, java]

After Clear arrayList is=[]

Method 2:

import java.util.ArrayList;

public class RemoveAll2 {

    public static void main(String[] args) {
        ArrayList<String> arr = new ArrayList<String>();
        // add element in arraylist
        arr.add("c");
        arr.add("php");
        arr.add("html");
        arr.add("java");
        // print arraylist
        System.out.println("Before Removing arrayList is = " + arr);

        arr.removeAll(arr);
        System.out.println("After Remove all element of aarraylist is="+arr);

    }

}

Output:

Before Removing arrayList is = [c, php, html, java]

After Remove all element of aarraylist is=[]

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