Java is a high-level, platform-independent, object-oriented programming language originally developed by Sun Microsystems. Java is currently owned by Oracle, which purchased Sun in 2010.

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77
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16answers
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When are Getters and Setters Justified

Getters and setters are often criticized as being not proper OO. On the other hand most OO code I've seen has extensive getters and setters. When are getters and setters justified? Do you try to ...
542
votes
22answers
54k views

Where did the notion of “one return only” come from?

I often talk to Java programmers who say "Don't put multiple return statements in the same method." When I ask them to tell me the reasons why, all I get is "The coding standard says so." or "It's ...
25
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6answers
3k views

How do you encode Algebraic Data Types in a C#- or Java-like language?

There are some problems which are easily solved by Algebraic Data Types, for example a List type can be very succinctly expressed as: data ConsList a = Empty | ConsCell a (ConsList a) consmap f ...
23
votes
6answers
7k views

Is there a canonical book for learning Java as an experienced developer? [closed]

I have been a .NET developer now for about the past 5/6 years give or take. I have never done any professional Java development and the last time I really touched it was probably back in college. I ...
52
votes
12answers
5k views

Did the developers of Java consciously abandon RAII?

As a long-time C# programmer, I have recently come to learn more about the advantages of Resource Acquisition Is Initialization (RAII). In particular, I have discovered that the C# idiom: using (var ...
15
votes
6answers
4k views

Efficient try / catch block usage?

Should catch blocks be used for writing logic i.e. handle flow control etc? Or just for throwing exceptions? Does it effect efficiency or maintainability of code? What are the side effects (if there ...
6
votes
6answers
1k views

Should I extract specific functionality into a function and why?

I have a large method which does 3 tasks, each of them can be extracted into a separate function. If I'll make an additional functions for each of that tasks, will it make my code better or worse and ...
277
votes
39answers
218k views

Why isn't Java used for modern web application development? [closed]

As a professional Java programmer, I've been trying to understand - why the hate toward Java for modern web applications? I've noticed a trend that out of modern day web startups, a relatively small ...
50
votes
1answer
7k views

What are these different Java versions for?

I am just about to start my Java journey, ( I've already dabbled in C++) but I am getting really confused about all the different versions of Java: JavaSE JavaEE JavaFX etc. Can someone explain ...
42
votes
8answers
4k views

Why a static main method in Java and C#, rather than a constructor?

I’m Looking for a definitive answer from a primary or secondary source for why (notably) Java and C# decided to have a static method as their entry point, rather than representing an application ...
20
votes
11answers
4k views

Is it a really required skill to program without API documentation?

I barely passed my Java programming exam today. I had to answer some general questions about threading which I did well and to write a little threaded program which was worse. I had to connect my ...
1
vote
2answers
2k views

What other reasons are there to write interfaces rather than abstract classes? [duplicate]

Possible Duplicate: When to use abstract classes instead of interfaces and extension methods in C#? When I read and looked at codes using Abstract classes, I was able to justify it because ...
145
votes
10answers
16k views

Mono is frequently used to say “Yes, .NET is cross-platform”. How valid is that claim? [closed]

In What would you choose for your project between .NET and Java at this point in time? I say that I would consider the "Will you always deploy to Windows?" the single most important (EDIT: technical) ...
24
votes
15answers
28k views

When is Java a good choice for web development? [closed]

When is Java a good choice for web development? Please do not say "When you have a development team that knows only Java."
7
votes
4answers
1k views

Make methods that do not depend on instance fields, static?

Recently I started programming in Groovy for a integration testing framework, for a Java project. I use Intellij IDEA with Groovy plug-in and I am surprised to see as a warning for all the methods ...
53
votes
3answers
24k views

How is a Java reference different from a C pointer?

C has pointers and Java has what is called references. They have some things in common in the sense that they all point to something. I know that pointers in C store the addresses they point to. Do ...
65
votes
10answers
40k views

How do you unit test private methods?

I am working on a java project. I am new to unit testing. What is the best way to unit test private methods in java classes?
38
votes
6answers
8k views

What is the point of having every service class have an interface? [duplicate]

At the company I work at, every service class has a corresponding interface. Is this necessarily? Most of these interfaces are only used by a single class and we are not creating any sort of public ...
27
votes
11answers
10k views

Is it good practice to catch a checked exception and throw a RuntimeException?

I read some code of a colleague and found that he often catches various exceptions and then always throws a 'RuntimeException' instead. I always thought this is very bad practice. Am I wrong?
3
votes
2answers
828 views

Which Java framework meets these requirements?

Which Java framework meets these requirements? What set of frameworks would be best suited to meet these requirements? The requirements are: oriented for web support for transactions support for ...
42
votes
9answers
14k views

Why is String immutable in Java?

I couldn't understand the reason of it. I always use String class like other developers, but when I modify the value of it, I need to create new instance of String. What might be the reason of ...
54
votes
11answers
5k views

I've been told that Exceptions should only be used in exceptional cases. How do I know if my case is exceptional?

My specific case here is that the user can pass in a string into the application, the application parses it and assigns it to structured objects. Sometimes the user may type in something invalid. ...
35
votes
11answers
3k views

What are the factors that have made Java a success as a programming language in enterprise computing?

What are the factors that have made Java a success as a programming language in enterprise computing?
14
votes
9answers
2k views

How do you learn to program? [duplicate]

Possible Duplicates: I still can't figure out how to program? I'm graduating with a Computer Science degree but I don't feel like I know how to program I don't known if you guys ...
24
votes
4answers
10k views

How to justify migration from Java 6 to Java 7?

We were migrating from Java 6 to Java 7. The project is behind schedule and risks being dropped, in which case it will continue to use Java 6. What are the specific improvements in Java 7 that we ...
29
votes
4answers
10k views

In Java, should I use “final” for parameters and locals even when I don't have to?

Java allows marking variables (fields / locals / parameters) as final, to prevent re-assigning into them. I find it very useful with fields, as it helps me quickly see whether some attributes - or an ...
12
votes
8answers
7k views

What is the point of an interface? [duplicate]

Possible Duplicate: When to use abstract classes instead of interfaces and extension methods in C#? What other reasons are there to write interfaces rather than abstract classes? This ...
13
votes
5answers
6k views

What is the difference between all-static-methods and applying a singleton pattern?

I am making a database to store information about the users of my website (I am using stuts2 and hence Java EE technology). For the database I'll be making a DBManager. Should I apply singleton ...
13
votes
7answers
10k views

Is Java (still) the cross platform language of choice? [closed]

When I started using Java in the nineties, it was all "Write once, run anywhere!" from day one. That was probably all true then and I was a part of the choir as well. I am not sure what to think ...
85
votes
11answers
22k views

What backs up the claim that C++ can be faster than a JVM or CLR with JIT? [closed]

A reoccurring theme on SE I've noticed in many questions is the ongoing argument that C++ is faster and/or more efficient than higher level languages like Java. The counter-argument is that modern JVM ...
27
votes
8answers
21k views

Can we use Java for commercial use?

The Java is GPL license (reference from wikipedia). I am not sure I can use it in in commercial projects. I already have a website written in Java and I plan to use this for commercial use. Is that ...
25
votes
4answers
25k views

What is the point of using DTO (Data Transfer Objects)?

What is the point of using DTO and is it an out dated concept? I use POJOs in the view layer to transfer and persist data. Can these POJOs be considered as an alternative to DTOs?
1
vote
4answers
2k views

how to learn Java [closed]

This question I am asking because I couldn't find any source which gives complete overview of java development. I just want to know where java technology currently in market & what is preferable ...
24
votes
9answers
6k views

Should the methods of a class call its own getters and setters?

Where I work I see lots of classes that do things like this: public class ClassThatCallsItsOwnGettersAndSetters { private String field; public String getField() { return field; ...
8
votes
6answers
2k views

Is it necessary to write a javadoc comment for EVERY parameter in a method's signature?

One of the devs on my team believes that it is necessary to write a javadoc comment for EVERY parameter in a method's signature. I do not think this is necessary, and in fact I think it can even be ...
11
votes
2answers
1k views

Java and JVM license

Does Java license allow other companies to create their own versions of Java language or just implement it accurately? Same question about JVM. I heard about Sun suing Microsoft for changing their ...
7
votes
3answers
5k views

Does it make a difference if I declare variables inside or outside a loop in Java? [duplicate]

Possible Duplicate: Where do you declare variables? The top of a method or when you need them? Does it make a difference if I declare variables inside or outside a loop in Java? Is this ...
108
votes
12answers
24k views

Should we avoid object creation in Java?

I was told by a colleague that in Java object creation is the most expensive operation you could perform. So I can only conclude to create as few objects as possible. This seems somewhat to defeat ...
84
votes
6answers
84k views

What does the Spring framework do? Should I use it? Why or why not? [closed]

So, I'm starting a brand-new project in Java, and am considering using Spring. Why am I considering Spring? Because lots of people tell me I should use Spring! Seriously, any time I've tried to get ...
58
votes
2answers
22k views

Choosing between Single or multiple projects in a git repository?

In a git environment, where we have modularized most projects, we're facing the one project per repository or multiple projects per repository design issue. Let's consider a modularized project: ...
32
votes
7answers
7k views

Is Functional Programming possible in Java?

I was browsing through the Amazon.com Bookstore and I came across the book "Functional Programming for Java Developers". I know some very basic Functional Programming and have been programming in ...
49
votes
7answers
31k views

Why use try … finally without a catch clause?

The classical way to program is with try / catch but when is it appropriate to use try without catch? In Python the following appears legal and can make sense: try: #do work finally: #do ...
14
votes
6answers
3k views

Best practices in comment writing and documentation

Commenting nowadays is easier than ever. In Java, there are some nice techniques for linking comments to classes, and Java IDEs are good at making comment shells for you. Languages like Clojure even ...
35
votes
7answers
5k views

Why do people nowadays use factory classes so often? [closed]

I've seen the history of several С#/Java class library projects on GitHub and CodePlex, and it seems like a trend. Why do people nowadays use factory classes so often for almost everything? I.e. We ...
11
votes
6answers
7k views

What would you choose for your project between .NET and Java at this point in time? [closed]

You are just starting a new project and you have these two technologies to choose from, Java and .NET. The project you are working doesn't involve having features that would make it easy to choose ...
13
votes
5answers
15k views

What's your advice for getting Oracle Certified Professional Java Programmer certificate? [closed]

I intend to get the certification but am not completely sure how to effectively prepare myself. So I'm wondering if you have any advice on the matter; in particular I would like to know: What should ...
54
votes
5answers
3k views

Why were Java collections implemented with “optional methods” in the interface?

During my first implementation extending the Java collection framework, I was quite surprised to see that the collection interface contains methods declared as optional. The implementer is expected ...
40
votes
6answers
4k views

How necessary is it to follow defensive programming practices for code that will never be made publicly available?

I'm writing a Java implementation of a card game, so I created a special type of Collection I'm calling a Zone. All modification methods of Java's Collection are unsupported, but there's a method in ...
24
votes
2answers
2k views

Do modern languages still use parser generators?

I was researching about the gcc compiler suite on wikipedia here, when this came up: GCC started out using LALR parsers generated with Bison, but gradually switched to hand-written ...
13
votes
5answers
7k views

Is Java a good choice for cross-platform games? [closed]

I'm looking to create a game in Java and would like it to work on Windows, Linux, and Mac. I'm pretty sure C# is a bad choice for this, and I don't have enough experience in C or C++. I want to stay ...