How Can I Easily Pad Strings to a Specific Length in Java?

Padding Strings in Java Made Easy

In Java, the need to pad strings to a certain length often arises. String manipulation can be tedious, but there's a convenient solution using String.format().

String.format() comes to the rescue, providing built-in padding functionality. Using a simple format string, you can control the alignment and width of the resulting string:

• Left Padding: Add %-s to left-pad with spaces to the specified width.
• Right Padding: Add %-number>s to right-pad with spaces to the specified width.

For example, the following code demonstrates how to pad strings in Java:

public class StringPadding {

    public static String padRight(String s, int n) {
        return String.format("%-" + n + "s", s);
    }

    public static String padLeft(String s, int n) {
        return String.format("%" + n + "s", s);
    }

    public static void main(String[] args) {
        System.out.println(padRight("Howto", 20) + "*");
        System.out.println(padLeft("Howto", 20) + "*");
    }
}

Output:

Howto               *
               Howto*

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