Add java folder

java/cat-years-dog-years.java

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+/* I have a cat and a dog.
+
+I got them at the same time as kitten/puppy. That was humanYears years ago.
+
+Return their respective ages now as [humanYears,catYears,dogYears]
+
+NOTES:
+
+humanYears >= 1
+Cat Years
+15 cat years for first year
++9 cat years for second year
++4 cat years for each year after that
+Dog Years
+15 dog years for first year
++9 dog years for second year
++5 dog years for each year after that */
+
+public static int[] humanYearsCatYearsDogYears(final int humanYears) {
+  int catAge;
+  int dogAge;
+  if (humanYears == 1) {
+    catAge = 15;
+    dogAge = 15;
+  }
+  else if (humanYears == 2) {
+    catAge = 15 + 9;
+    dogAge = 15 + 9;
+  }
+  else {
+    catAge = (15 + 9 + (4 * (humanYears - 2)));
+    dogAge = (15 + 9 + (5 * (humanYears - 2)));
+  }
+  return new int[]{humanYears,catAge,dogAge};
+}