Add code for Radix Sort.

Sorting Algorithms/Java/RadixSort.java

@@ -0,0 +1,60 @@
+import java.io.*;
+import java.util.*;
+
+class RadixSort {
+
+    static int getMax(int arr[], int n)
+    {
+        int mx = arr[0];
+        for (int i = 1; i < n; i++)
+            if (arr[i] > mx)
+                mx = arr[i];
+        return mx;
+    }
+
+    static void countSort(int arr[], int n, int exp)
+    {
+        int output[] = new int[n];
+        int i;
+        int count[] = new int[10];
+        Arrays.fill(count,0);
+
+        for (i = 0; i < n; i++)
+            count[ (arr[i]/exp)%10 ]++;
+
+        for (i = 1; i < 10; i++)
+            count[i] += count[i - 1];
+
+        for (i = n - 1; i >= 0; i--)
+        {
+            output[count[ (arr[i]/exp)%10 ] - 1] = arr[i];
+            count[ (arr[i]/exp)%10 ]--;
+        }
+
+        for (i = 0; i < n; i++)
+            arr[i] = output[i];
+    }
+
+    static void radixsort(int arr[], int n)
+    {
+        int m = getMax(arr, n);
+
+        for (int exp = 1; m/exp > 0; exp *= 10)
+            countSort(arr, n, exp);
+    }
+
+    static void print(int arr[], int n)
+    {
+        for (int i=0; i<n; i++)
+            System.out.print(arr[i]+" ");
+    }
+
+
+    public static void main (String[] args)
+    {
+        int arr[] = {15,23,78,65,90,110,88,74};
+        int n = arr.length;
+        radixsort(arr, n);
+        print(arr, n);
+    }
+}