How to Efficiently Pad Strings in Java?

Java String Padding Techniques

Question:

How can one conveniently pad a string in Java, resembling a StringUtil-like functionality?

Answer:

Java 1.5 introduced a highly effective method for string padding using String.format(). This method enables left or right padding with specified character width.

Implementation:

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);  
}

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

Output:

Howto               *
               Howto*

By utilizing the String.format() method, you can effortlessly pad strings to meet your alignment requirements.

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