[CodeWorkout] X121: extraEnd

Question

Given a string, return a new string made of 3 copies of the last 2 chars of the original string. The string's length will be at least 2.

 

Answer

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public class X121 {
  public static void main(String[] args) {
    String str = "";

    str = "Hello";
    System.out.printf("[str = %s]\n", str);
    System.out.println(extraEnd(str));
    str = "Hi";
    System.out.printf("[str = %s]\n", str);
    System.out.println(extraEnd(str));
    str = "Candy";
    System.out.printf("[str = %s]\n", str);
    System.out.println(extraEnd(str));
  }

  public static String extraEnd(String str) {
    String result = "";
    for (int i = 0; i < 3; i++) {
      result += str.substring(str.length() - 2);
    }
    return result;
  }
}

 

Use the String.repeat() method provided by JDK11

public class X121 {
  public static void main(String[] args) {
    String str = "";

    str = "Hello";
    System.out.printf("[str = %s]\n", str);
    System.out.println(extraEnd(str));
    str = "Hi";
    System.out.printf("[str = %s]\n", str);
    System.out.println(extraEnd(str));
    str = "Candy";
    System.out.printf("[str = %s]\n", str);
    System.out.println(extraEnd(str));
  }

  public static String extraEnd(String str) {
    return str.substring(str.length() - 2).repeat(3);
  }
}

 

Ref

https://github.com/bbubbush/codeworkout/blob/master/src/com/bbubbush/tistory/X121.java

GitHub - bbubbush/codeworkout