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." ...

GuavaPreconditionsDemo.java. package dustin.examples; ... String array index number (3) must be less than size (2) at com.google.common.base.Preconditions.checkElementIndex ...

In Java an array is a way of storing multiple items of the same type. In this quick tutorial we introduce you to the very basics. ... System.out.println("Element at index 5: " + numbers[5]); ...