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The do loop

Textbook: Section 8.3

We've already seen the while loop and the for loop. This is the final type of loop available in Java: The do loop. It's useful when you have a while loop, but you always want the first iteration to occur. For example, you might have handled the Nim program as follows.

import csbsju.cs160.*;

public class Nim {
    public static void main(String[] args) {
        String line;
        do {
            playGame();
            IO.print("again (y/n)? ");
            line = IO.readLine();
        } while(line.startsWith("y"));
    }
}

Notice that I had to define line outside the loop. If it was declared when it is assigned a value (the line calling IO.readLine(), the variable wouldn't be visible within the condition on the following line, since that condition follows the closing brace within which the declaration would be.

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