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Can this be done in Java? If it is not possible to implement this pattern in Java, is there an elegant way to implement it in another language? …

I studied Computer Science during the early nineties right before Java came out. The approach followed by our professors was the following. … Going back to the question of teaching Java. …

In imperative languages like C, C++, Java, etc. you normally use a while or for loop when you do not need a stack, and you use recursive calls when you need a stack (you implicitly use the run-time stack …

When executing your code, the Java runtime does the following: Cast null to an object of class Integer. …

My advice is that you find yourself a small but concrete project. If you want to practice if statements, implementing some kind of classification quiz could be a good excercise: the program asks the u …

Have you considered using some kind of currying? Imagine that you have a class Processee and a class Processor: class Processor { private final Processee _processee; public Processor(Process …

The signature of a method is the interface to the callers of the method. In your case: int Math.abs(int someNumber); tells you that Math.abs() takes an integer number and returns another integer n …

I use Java for the implementation and I represent such an aggregation as a field of type List<B> in A, and a field of type A in B. In this way, each object can be the root of an aggregation tree. … So, is one of the two possibilities (shallow versus deep equality) considered a more idiomatic choice for implementing the equals method in Java? …

I often wonder why Java uses :: for method references instead of ., e.g. why write System.out::println instead of System.out.println Of course, one might simply answer: "because the designers … On the other hand, I would have expected the second syntax because the dot is the usual Java syntax for accessing class members. …

Java was not designed for functional programming and so, while you can use a functional programming style in Java (immutable state, recursion, function composition, high-order functions, ...), you will … Therefore, even though a functional style in Java can make your code (sometimes) more readable or (more often) more robust, if you really want to use it heavily you'd better use a language that was designed …

Or are there any major features in Java for which there is no direct Scala equivalent? … Or can I expect that, given a Java program, I can port it to Scala almost line-by-line? …

What about changing the visitor interface to remove the dependency from a to b? package pkg.a; public abstract ClassA extends ClassA { public abstract void accept(ClassAVisitor visitor); …

As others have pointed out, you are correct that an immutable singly-linked list requires copying the entire list when performing an append operations. Often you can use the workaround of implementin …

Starting with Java 8 (and maybe even more strongly with subsequent versions of Java), there will be changes in the semantics of the Java language. … Summarizing: can we expect that the future development of Java will have an impact on languages like Scala and Clojure to maintain interoperability with Java? …

in Java? … I wrote a Java implementation (Java 6) and a Scala implementation (Scala 2.9). I have run both on Eclipse Indigo under Ubuntu 10.04. …