String sorting

Author: giaunv

java-examples/collections/src/main/java/com/hellokoding/java/collections/StringSortAscending.java

@@ -0,0 +1,21 @@
+package com.hellokoding.java.collections;
+
+import java.util.Arrays;
+
+public class StringSortAscending {
+    static String sortAsc(String str) {
+        // convert String to char array
+        char[] arr = str.toCharArray();
+
+        // sort char array in alphabetically / ascending order
+        Arrays.sort(arr);
+
+        // String join char array
+        return String.valueOf(arr);
+    }
+
+    public static void main(String[] args) {
+        String str = "bac";
+        System.out.println(sortAsc(str));
+    }
+}

java-examples/collections/src/main/java/com/hellokoding/java/collections/StringSortDescending.java

@@ -0,0 +1,24 @@
+package com.hellokoding.java.collections;
+
+import java.util.Arrays;
+import java.util.Comparator;
+import java.util.Objects;
+import java.util.stream.Collectors;
+
+public class StringSortDescending {
+    static String sortDesc(String str) {
+        // convert String to Character array
+        Character[] arr = str.chars().mapToObj(c -> (char)c).toArray(Character[]::new);
+
+        // sort Character array in descending order
+        Arrays.sort(arr, Comparator.reverseOrder());
+
+        // String join Character array
+        return Arrays.stream(arr).map(Objects::toString).collect(Collectors.joining());
+    }
+
+    public static void main(String[] args) {
+        String str = "bac";
+        System.out.println(sortDesc(str));
+    }
+}