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java/sum/SumHex.java

@@ -0,0 +1,42 @@
+package sum;
+
+/**
+ * @author Nikita Doschennikov (me@fymio.us)
+ */
+public class SumHex {
+
+    public static void main(String[] args) {
+        int res = 0;
+        for (String arg : args) {
+            StringBuilder builder = new StringBuilder();
+            for (char c : arg.toCharArray()) {
+                if (!Character.isWhitespace(c)) {
+                    builder.append(c);
+                } else {
+                    res += compute(builder.toString());
+
+                    builder = new StringBuilder();
+                }
+            }
+            res += compute(builder.toString());
+        }
+        System.out.println(res);
+    }
+
+    static int compute(String num) {
+        int res = 0;
+        if (num.isEmpty()) {
+            res += 0;
+        } else if (
+            num.length() >= 2 &&
+            num.charAt(0) == '0' &&
+            (num.charAt(1) == 'x' || num.charAt(1) == 'X')
+        ) {
+            res += Long.decode(num);
+        } else {
+            res += Integer.parseInt(num);
+        }
+
+        return res;
+    }
+}