It is created in the constructor and changed or accessed by the methods. Notice that it uses a complex conditional ( &) on line 14 to make sure that the loop doesn’t go beyond the length of the array, because if you had an array that had less than 5 elements, you wouldn’t want the code to try to double the 5th element which doesn’t exist! Notice that in this code, the array is a private instance variable of the class ArrayWorker. The following code doubles the first five elements in an array. You can loop through just some of the elements of an array using a for loop. You don’t have to loop through all of the elements of an array. You must start at the length of the array minus one. You can not start the index at the length of the array.The method will only return -1 if no value in the array is less than the passed value.
You can also follow it in the visualizer by clicking on the Show Code Lens button. What do you think the following code will print out? First trace through it on paper keeping track of the array and the index variable.
