In Eclipse, I see that ArrayList objects have a modCou开发者_如何学JAVAnt field. What is its purpose? (number of modifications?)It allows the internals of the list to know if there has been a structur
Simple question. I have a new list and an old list. In Java is there a standard way/library that allows me to compare these two lists and determine which items have been updated/deleted or are comple
Assume a class (for instance URI) that is convertable to and from a String using the constructor and toString() method.
I\'m going round in circles at the moment trying to get the pattern right for using Dependency Injection with a number of IEnumerables.
Chosen Solution Thanks for the help everyone.I\'ve decided to do the following. public static class PersonCollection
I have to create a method which has an ArrayList; I need to remove even numbers from this ArrayList. I have written code for that but there is a logical error which I couldn\'t identify.
If I have a collec开发者_StackOverflowtion, such as Collection<String> strs, how can I get the first item out? I could just call an Iterator, take its first next(), then throw the Iterator away.
I have two maps of type Map<Long, Integer>, one named \"oldValues\" representing the old state of an object, and the other named \"newValues\" representing the new开发者_如何学Go state of the sa
I want a method to only work on types which implement the /, +, -, * operators. Is there any \"clean\" way to do t开发者_如何转开发his?This would require an interface, such as IArithmetic.
I need to write a generic class where the type parameter must be something i开发者_如何学运维mplementing ICollection<T>. Inside of MyClass I need the collection\'s item type (in the code snippet
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