To ask a plain array how many elements are currently stored in the array you use youriown count variable which you have to maintain. To ask an ArrayList how many elements are currently stored in the array you use the. Some commonly used methods of the ArrayList are :
An ArrayList can be defined to hold any non primitive type. **You can put nulls into the list but we'll talk later about that and we don't need nulls for this assignment. This means your ArrayList is an array of Strings and you can only put strings into it. Notice the before the ArrayList constructor.
The ArrayList provides several other methods that put new values into the array or remove elements. add() method that will append a new element to the end of the array. The most commonly used method will be the. The ArrayList will by default declare a plain array of a small capacity then automatically upsize that array as needed without any thought or action on your part. A plain array on the other hand requires you specify how big the array is and that capacity cannot be changed. add() elements to the array indefinitely. This is because a ArrayList can change in size as you use it by letting you. An ArrayList does not require you to specify how big you want the ArrayList to be. A plain array requires the use of s to specify a dimension for the array. Notice there are several differences in how a ArrayList is declared vs. String wordList = new String // plain array ArrayList maintains its own internal count (.size() ) and resizes itself automatically as soon as the underlaying array gets full.ĪrrayList wordList = new ArrayList() // ArrayList Arrays library ArrayList class contains an array and also contains many methods that operate on the array (add() remove().
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