Java ArrayList length example

Java ArrayList length example shows how to get the length of the ArrayList. The example also shows how to get size or length of an ArrayList using the size method.

How to get ArrayList length in Java (ArrayList size)?

To get the length of the ArrayList, use the size method of ArrayList.

1	public int size()

This method returns number of elements in the ArrayList. It returns 0 if the ArrayList is empty.

Example

package com.javacodeexamples.collections.arraylist;

import java.util.ArrayList;

public class ArrayListLengthExample {

public static void main(String[] args) {

//create new ArrayList object

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

* Use size method of ArrayList

* to get length of the ArrayList

System.out.println( "ArrayList length: " + aListNames.size() );

System.out.println("Adding 2 elements to ArrayList");

//add some elements

aListNames.add("Julia");

aListNames.add("Max");

//this should return 2, as we added 2 elements to ArrayList

System.out.println( "ArrayList length: " + aListNames.size() );

}

Output

ArrayList length: 0

Adding 2 elements to ArrayList

ArrayList length: 2

You can use the size method to get the number of elements contained in the ArrayList and loop through them as given below.

package com.javacodeexamples.collections.arraylist;

import java.util.ArrayList;

public class ArrayListLengthExample {

public static void main(String[] args) {

//create new ArrayList object

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

//add some elements

aListNames.add("Julia");

aListNames.add("Max");

System.out.println("ArrayList contains: ");

for(int i=0; i < aListNames.size(); i++)

System.out.println( aListNames.get(i) );

}

Output

ArrayList contains:

Julia

Max

This example is a part of the Java ArrayList tutorial.

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How to get ArrayList length in Java (ArrayList size)?

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