How to clear Arraylist in java

To clear ArrayList in java we have 2 ways
1. void clear() – Clears all the elements that are present in the ArrayList

2. boolean removeAll(Collection<?> c) – Removes those elements that are passed in as param and are available in the ArrayList.

Now lets see some examples of these methods

1. Clear Arraylist in java using clear()

package com.kscodes.sampleproject;

import java.util.ArrayList;

import java.util.List;

public class ArrayListClear {

public static void main(String[] args) {

List<String> arrayList1 = new ArrayList<>();

arrayList1.add("Java");

arrayList1.add("JSP");

arrayList1.add("JavaScript");

System.out.println("ArrayList contains following elements :: " + arrayList1);

arrayList1.clear();

System.out.println("After calling clear() ArrayList contains following elements :: " + arrayList1);

}

1 2	ArrayList contains following elements :: [Java, JSP, JavaScript] After calling clear() ArrayList contains following elements :: []