all tasks

Task/Sort-stability/Java/sort-stability.java

@@ -0,0 +1,47 @@
+import java.util.Arrays;
+import java.util.Comparator;
+
+public class RJSortStability {
+
+  public static void main(String[] args) {
+    String[] cityList = { "UK  London", "US  New York", "US  Birmingham", "UK  Birmingham", };
+
+    String[] cn = cityList.clone();
+    System.out.println("\nBefore sort:");
+    for (String city : cn) {
+      System.out.println(city);
+    }
+
+    // sort by city
+    Arrays.sort(cn, new Comparator<String>() {
+      public int compare(String lft, String rgt) {
+        return lft.substring(4).compareTo(rgt.substring(4));
+      }
+    });
+
+    System.out.println("\nAfter sort on city:");
+    for (String city : cn) {
+      System.out.println(city);
+    }
+
+    cn = cityList.clone();
+    System.out.println("\nBefore sort:");
+    for (String city : cn) {
+      System.out.println(city);
+    }
+
+    // sort by country
+    Arrays.sort(cn, new Comparator<String>() {
+      public int compare(String lft, String rgt) {
+        return lft.substring(0, 2).compareTo(rgt.substring(0, 2));
+      }
+    });
+
+    System.out.println("\nAfter sort on country:");
+    for (String city : cn) {
+      System.out.println(city);
+    }
+
+    System.out.println();
+  }
+}