Arraylist Api In Java Code Example

Example 1: java arraylist

import java.util.List; //list abstract class import java.util.ArrayList; //arraylist class  //Object Lists List l = new ArrayList(); ArrayList a = new ArrayList();  //Specialized List List<String> l = new ArrayList<String>(); ArrayList<Integer> a = new ArrayList<Integer>(); //only reference data types allowed in brackets <>  //Initial Capacity List<Double> l = new ArrayList<Double>(5); //list will start with a capacity of 5 //saves allocation times

Example 2: arraylist java methds

import java.util.ArrayList; ArrayList<Integer> myList = new ArrayList<Integer>(); myList.add(0); myList.remove(0);//Remove at index 0 myList.size(); myList.get(0);//Return element at index 0