You can add one or several random numbers into your array variables, but Java does not guarantee that each number is unique. Right-click the Java file you want to edit and select "Open With." ...

The number of elements the array can store is defined upon creation and cannot ... Names for arrays have to respect the usual Java variable naming conventions. Of course, you not only want to ...

Another type of array in Java is the map. A map is an associative array that uses key/value pairs that do not change. This is a perfect way to store phone numbers, for example. Here, you might use ...