Left justification : Formatter Flags « Development « Java Tutorial

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By default, all output is right-justified.

You can force output to be left-justified by placing a minus sign directly after the %.

For example, %-10.2f left-justifies a floating-point number with two decimal places in a ten-character field.

import java.util.*;

public class MainClass {
  public static void main(String args[]) {
    Formatter fmt = new Formatter();

    // Right justify by default.
    fmt.format("|%10.2f|", 123.123);
    System.out.println(fmt);

    // Now, left justify.
    fmt = new Formatter();
    fmt.format("|%-10.2f|", 123.123);
    System.out.println(fmt);
  }
}

|    123.12|
|123.12    |