Link to the actual page. please make sure you get full point :

http://codecheck.it/files?repo=fall2017&problem=q2

Implement the method Strings.uniqueLetters(String str) that returns a string of those letters that only occur once in str, in the same order that they appear in the original. For example, uniqueLetters("harrasses") should return "he" since the letters a, r, and s occur multiple times.

Complete the following file:

Strings.java

public class Strings { public static String uniqueLetters(String str) { ... } }

Use the following file:

Tester.java

public class Tester { public static void main(String[] args) { int[] a = new int[] { 5, 4, 1, 9, 2, 6 }; Arrays.swapLargestAndSmallest(a); System.out.println(java.util.Arrays.toString(a)); System.out.println("Expected: [5, 4, 9, 1, 2, 6]"); a = new int[] {1, 4, 1, 9, 2, 6}; Arrays.swapLargestAndSmallest(a); System.out.println(java.util.Arrays.toString(a)); System.out.println("Expected: [9, 4, 1, 1, 2, 6]"); a = new int[] {1, 4, 2, 9, 9, 6}; Arrays.swapLargestAndSmallest(a); System.out.println(java.util.Arrays.toString(a)); System.out.println("Expected: [9, 4, 2, 9, 1, 6]"); a = new int[] {1}; Arrays.swapLargestAndSmallest(a); System.out.println(java.util.Arrays.toString(a)); System.out.println("Expected: [1]"); } }