Initial data commit

Task/Sierpinski-triangle/Java/sierpinski-triangle.java

@@ -0,0 +1,44 @@
+public class SierpinskiTriangle {
+
+    public static void main(String[] args) {
+        System.out.println(getSierpinskiTriangle(4));
+    }
+
+    private static final String getSierpinskiTriangle(int n) {
+        if ( n == 0 ) {
+            return "*";
+        }
+
+        String s = getSierpinskiTriangle(n-1);
+        String [] split = s.split("\n");
+        int length = split.length;
+
+        //  Top triangle
+        StringBuilder sb = new StringBuilder();
+        String top = buildSpace((int)Math.pow(2, n-1));
+        for ( int i = 0 ; i < length ;i++ ) {
+            sb.append(top);
+            sb.append(split[i]);
+            sb.append("\n");
+        }
+
+        //  Two triangles side by side
+        for ( int i = 0 ; i < length ;i++ ) {
+            sb.append(split[i]);
+            sb.append(buildSpace(length-i));
+            sb.append(split[i]);
+            sb.append("\n");
+        }
+        return sb.toString();
+    }
+
+    private static String buildSpace(int n) {
+        StringBuilder sb = new StringBuilder();
+        while ( n > 0 ) {
+            sb.append(" ");
+            n--;
+        }
+        return sb.toString();
+    }
+
+}