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Thread: How to align text?

  1. #1
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    Unhappy How to align text?

    How should I align text to the right?

    Here is a part from my code:

    System.out.println (subj1 + "\t" + gradesubj1 + "%"); // Subject and Mark for Subject 1

    I want to align the output for subj1 to the left.
    I want to align the output for gradesubj1 and the rest to the left.

    How should I do it?


  2. #2
    Super Moderator pbrockway2's Avatar
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    Default Re: How to align text?

    PrintStream (like System.out) also has a printf() method.

     
    import java.util.Map;
    import java.util.TreeMap;
     
    public class PrintfEg {
        public static void main(String[] args) {
            Map<String,Double> data = new TreeMap<String,Double>() {
                {
                    put("First", 2000.0);
                    put("Second", Math.PI);
                    put("Last", -1.0);
                }
            };
     
            for(Map.Entry<String,Double> entry :data.entrySet()) {
                System.out.printf("%-10s%8.3f%%%n", entry.getKey(), entry.getValue());
            }
        }
    }

    The format string, "%-10s%8.3f%%%n" determines how the output will appear. %-10s prints a left aligned string of width 10 and padded with spaces. %8.3f produces a floating point value, right aligned 8 characters wide with 3 decimal places. (Math.PI is suitably rounded). %% produces a % sign. And %n produces the newline character for the OS on which it runs.

    There is much more to the use of these format strings with detail linked to from the API docs.

  3. The Following User Says Thank You to pbrockway2 For This Useful Post:

    shifat96 (February 18th, 2012)

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    Default Re: How to align text?

    Thank You!

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    Super Moderator pbrockway2's Avatar
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    Default Re: How to align text?

    You're welcome.

    There is probably too much detail in the format string syntax to try and remember. I tend to look things up as I need them. It's useful, though, because a similar formatting notation is used in a number of programming languages.

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    Junior Member keep smiling's Avatar
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    Default Re: How to align text?

    i got the same problem but i found help from this:

    Java - printf - YouTube

    i hope it helps you too

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