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Data access object (DAO) in Java
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Check also the sequence diagram here:
http://www.oracle.com/technetwork/java/dataaccessobject-138824.html
Maybe a simple example can help you understand the concept:
Let's say we have an entity to represent an employee:
public class Employee {
private int id;
private String name;
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Volatile vs Static in Java
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Declaring a static variable in Java, means that there will be only one copy, no matter how many objects of the class are created. The variable will be accessible even with no Objects created at all. However, threads may have locally cached values of it.
W...
Scripting Language vs Programming Language [closed]
...before you can run it. But in the normal case, you don't have to compile a JavaScript program before you run it. So JavaScript is sometimes called a "scripting" language.
This line is getting more and more blurry since compilation can be so fast with modern hardware and modern compilation technique...
How to get the filename without the extension in Java?
... surprised how many convenience methods are already included in JDK 7 with java.nio.file.Files and Path -- such as resolving base directories, one-line copying/moving files, getting only the file name etc.
– Don Cheadle
Feb 19 '15 at 20:13
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Convert from java.util.date to JodaTime
I want to convert a java.util.Date to JodaTime so as to carry out subtractions between dates. Is there a good concise way to convert from Date to JodaTime ?
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What is an existential type?
... is relay the bytecode from VirtualMachine.compile to VirtualMachine.run.
Java type wildcards (ex: List<?>) are a very limited form of existential types.
Update: Forgot to mention that you can sort of simulate existential types with universal types. First, wrap your universal type to hide t...
How to scale threads according to CPU cores?
I want to solve a mathematical problem with multiple threads in Java. my math problem can be separated into work units, that I want to have solved in several threads.
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Can constructors throw exceptions in Java?
... language-idiomatic way of expressing them: which is through exceptions in Java. To my mind, avoiding that idiom is where code gymnastics come in. Likewise mocking is far more effective when you've already used dependency injection rather than calling the constructor within the code. After all, when...
How to check type of variable in Java?
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Java is a statically typed language, so the compiler does most of this checking for you. Once you declare a variable to be a certain type, the compiler will ensure that it is only ever assigned values of that type (or values...
Convert Iterator to ArrayList
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In Java 8, you can use the new forEachRemaining method that's been added to the Iterator interface:
List<Element> list = new ArrayList<>();
iterator.forEachRemaining(list::add);
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