Why two methods, then? Theformat()method is used not just byPrintStreambut also by thejava.util.Formatterclass:
public class Formatter implements Flushable, Closeable
printf()is there solely to make C programmers feel nostalgic.
Formatteris the object-oriented equivalent ofsprintf()andfprintf()in C. Rather than writing its output onto the console, it writes it into a string, a file, or an output stream. Pass the object you want to write into to theFormatterconstructor. For example, this code fragment creates aFormatterthat writes data into a file named angles.txt:
Formatter formatter = new Formatter("angles.txt");
Once youíve created aFormatterobject, you can write to it using theformat()method just as you would withSystem.out.format(), except that the output goes into the file rather than onto the console:
Formatters are not output streams, but they can and should be flushed and closed just the same:
Please check back next week for the continuation of this article.
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