Add Sleep Sort in Java

Sorting Algorithms/Java/SleepSort.java

@@ -0,0 +1,38 @@
+import java.util.ArrayList;
+import java.util.concurrent.CountDownLatch;
+
+public class SleepSort {
+    //Sleep sort puts each element of an integer array into sleep at the same time
+    // due to the value differences, the smaller value would "wake up" first hence added to
+    // the array first and so on.
+    private static Thread Tread;
+
+    public static void main(String[] args) {
+        int[] nums = {0,1,2,3,4};
+        sleepSort(nums);
+    }
+
+    public static void sleepSort(int[] nums){
+        CountDownLatch completeSignal = new CountDownLatch(nums.length);
+        ArrayList<Integer> sortedNums = new ArrayList<>();
+        for(int i = 0; i<nums.length; i++){
+            int finalI = i;
+            new Thread(new Runnable() {
+                @Override
+                public void run() {
+                    completeSignal.countDown();
+                    try {
+                        completeSignal.await();
+                        //In order to make the sort more visible in console,
+                        // factor of 1000 milliseconds is applied.
+                        Tread.sleep(nums[finalI] * 1000);
+                        sortedNums.add(nums[finalI]);
+                        System.out.println("Current sorted nums: " + sortedNums.toString());
+                    } catch (InterruptedException e) {
+                        e.printStackTrace();
+                    }
+                }
+            }).start();
+        }
+    }
+}