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Task/Sierpinski-triangle/Java/sierpinski-triangle-1.java

@@ -0,0 +1,20 @@
+public static void triangle(int n){
+        n= 1 << n;
+        StringBuilder line= new StringBuilder(); //use a "mutable String"
+        char t= 0;
+        char u= 0; // avoid warnings
+        for(int i= 0;i <= 2 * n;++i)
+                line.append(" "); //start empty
+        line.setCharAt(n, '*'); //with the top point of the triangle
+        for(int i= 0;i < n;++i){
+                System.out.println(line);
+                u= '*';
+                for(int j= n - i;j < n + i + 1;++j){
+                        t= (line.charAt(j - 1) == line.charAt(j + 1) ? ' ' : '*');
+                        line.setCharAt(j - 1, u);
+                        u= t;
+                }
+                line.setCharAt(n + i, t);
+                line.setCharAt(n + i + 1, '*');
+        }
+}