HashMap in Java

To add an object to the ArrayList, we call the add() method on the ArrayList, passing a pointer to the object we want to store . This code adds pointers to three String objects to the ArrayList… list. add( “Easy” ); // Add three strings to the ArrayList list.

There are two methods to add elements to the list.

To create an array list in Java, you declare an ArrayList variable and call the ArrayList constructor to instantiate an ArrayList object and assign it to the variable : ArrayList friends = new ArrayList(); You can optionally specific a capacity in the ArrayList constructor: ArrayList friends = new ArrayList(100);