If you look at the scope of the variable ‘hoursWorked’ you will see that it is a member of the class (declared as private int) The two variables you are having trouble with are passed as parameters to the constructor. The error message is because ‘hours’ is out of scope in the setter.
Yeah. Queue LinkedList being the most trivial concrete implementation.
Building upon your existing Student class, this is how I usually do it, especially if I need more than one comparator. Usage: EDIT Since the release of Java 8 the inner class Comparators may be greatly simplified using lambdas. Java 8 also introduces a new method for the Comparator object thenComparing, which removes the need for doing manual checking of each comparator … Read more
Use this if your code or some libraries you are using uses Log4j directly, but you want to use a different SLF4J binding than Log4j. It will route the Log4j API calls to SLF4J to the binding you choose. You need to remove the Log4j library from your classpath and replace it with this dependency. Use … Read more
When its comes to the behavior of ArrayList and HashSet they are completely different classes. ArrayList ArrayList Does not validate duplicates. get() is O(1) contains() is O(n) but you have fully control over the order of the entries. get add contains next remove(0) iterator.remove ArrayList O(1) O(1) O(n) O(1) O(1) O(1) Not thread safe and to make it thread safe you have to use Collections.synchronizedList(…) HashSet … Read more
All your problems derive from this Which are enclosed in a try, catch block, the problem is that in case the program found an exception you are not returning anything. Put it like this (modify it as your program logic stands): For the second one you must catch the Exception from the encrypt method call, like this … Read more
It looks like there’s an extra space character in your string. You can use trim() to remove leading and trailing whitespaces: Or if you think the presence of a space means there’s something else wrong, you’ll have to look into it yourself, since we don’t have the rest of your code.
Connection timeouts (assuming a local network and several client machines) typically result from a) some kind of firewall on the way that simply eats the packets without telling the sender things like “No Route to host” b) packet loss due to wrong network configuration or line overload c) too many requests overloading the server d) … Read more
toCharArray followed by Arrays.sort followed by a String constructor call: EDIT: As tackline points out, this will fail if the string contains surrogate pairs or indeed composite characters (accent + e as separate chars) etc. At that point it gets a lot harder… hopefully you don’t need this 🙂 In addition, this is just ordering by ordinal, without … Read more
This is because although you have an object of SavingsAccount you are using refrence variable of type Account so you can access only those methods that are there in Account class. And you don’t have calculateBalance() method in your Account class. That’s why you are not able to access it and compiler complains that it cannot find a method named calculateBalance as it sees that reference type … Read more