Java: Pad string with stars

Using ‘String.format’ function you can pad string with specific characters.

Following function right pad the string with given character.

String rightPad(String str, int n, char charToPad) {

         return String.format("%-" + n + "s", str).replace(' ', charToPad);

}

Following function left pad the string with given character.

String leftPad(String str, int n, char charToPad) {

         return String.format("%" + n + "s", str).replace(' ', charToPad);

}

App.java

package com.sample.app;

public class App {

 private static String rightPad(String str, int n, char charToPad) {
  return String.format("%-" + n + "s", str).replace(' ', charToPad);
 }

 private static String leftPad(String str, int n, char charToPad) {
  return String.format("%" + n + "s", str).replace(' ', charToPad);
 }

 public static void main(String[] args) {
  String str = "hello";

  String leftPad = leftPad(str, 10, '*');
  String rightPad = rightPad(str, 10, '*');

  System.out.println(leftPad);
  System.out.println(rightPad);
 }

}

Output

*****hello

hello*****

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