Loops

This chapter will discuss three different kinds of loops in Java. Loops are structures that repeat the same set of actions over and over until a specified condition becomes false. To see why loops are useful, suppose we want to print the sum of 100 numbers entered by the user. With what we’ve seen so far, we’d have to write 100 separate prompts and input statements – this would be a big mess. Really, for each number we want to do exactly the same thing – print a prompt and read in the number. With a loop, we can repeat these two steps a certain number of times without having to write each one out separately.