java – Left padding a String with Spaces and Zeros

In this tutorial we are gonna see how to left pad a string with spaces and zeros:

1) Left pad with spaces

class LeftPaddingExample1 {
  public static void main(String[] args) {
    System.out.println("#" + padLeftSpaces("mystring", 10) + "@");
    System.out.println("#" + padLeftSpaces("mystring", 15) + "@");
    System.out.println("#" + padLeftSpaces("mystring", 20) + "@");
  }

  public static String padLeftSpaces(String str, int n) {
    return String.format("%1$" + n + "s", str);
  }
}

Output:

#  [email protected]
#       [email protected]
#            [email protected]

2) Left pad with Zeros

class LeftPaddingExample2 {
  public static void main(String[] args) {
    System.out.println("#" + padLeftZeros("mystring", 10) + "@");
    System.out.println("#" + padLeftZeros("mystring", 15) + "@");
    System.out.println("#" + padLeftZeros("mystring", 20) + "@");
 }

  public static String padLeftZeros(String str, int n) {
    return String.format("%1$" + n + "s", str).replace(' ', '0');
  }
}

Output:

#[email protected]
#[email protected]
#[email protected]