March 2014 update

Task/Jensens-Device/Java/jensens-device-2.java

@@ -0,0 +1,21 @@
+public class Jensen2 {
+
+    interface IntToDoubleFunction {
+        double apply(int n);
+    }
+
+    static double sum(int lo, int hi, IntToDoubleFunction f) {
+        double res = 0;
+        for (int i = lo; i <= hi; i++)
+            res += f.apply(i);
+        return res;
+
+    }
+    public static void main(String args[]) {
+        System.out.println(
+            sum(1, 100,
+                new IntToDoubleFunction() {
+                    public double apply(int i) { return 1.0/i;}
+                }));
+    }
+}