You dont have to loop through all of the elements of an array. You can loop through just some of the elements of an array using a for loop. The following code doubles the first five elements in an array. Notice that it uses a complex conditional (&&) on line 14 to make sure that the loop doesnt go beyond the length of the array, because if you had an array that had less than 5 elements, you wouldnt want the code to try to double the 5th element which doesnt exist! Notice that in this code, the array is a private instance variable of the class ArrayWorker. It is created in the constructor and changed or accessed by the methods.

What will the following code print out? Can you write a similar method called tripleFirstFour() that triples the first 4 elements of the array? Make sure you test it in main.