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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Thinking in Java 4th edition - How to read efficiently?

a) Is there anyone who could give me some tips how to read Bruce Eckel's book efficiently? b) How to learn JAVA so I can search for a job? So far I read 230 pages of Eckel's book in 19 days (i made ...
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2answers
37 views

Initialize in Field, Constructor, or Argument

If I know what a field will be initialized to, should I initialize it in the field, constructor, or receive it as a parameter? For example, where should I initialize an ArrayList? Initialized in ...
-4
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0answers
41 views

Where do programmers look for reference/documentation about Java's features/libraries/functions? [on hold]

Rookie programmers learning the language usually use a book or online materials.They are introduced to the language's syntax, common used functions for text processing or math operations. Only a small ...
4
votes
4answers
593 views

Naming boolean field that is a verb

In Java, by convention getter and setter for boolean fields will be isField() and setField(). This works perfectly fine with field names that are adjectives like active, visible, closed, etc. But how ...
2
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2answers
229 views

Unit testing and reality [on hold]

I m actually studying Unit testing, reading some articles on the internet and trying to understand how it works exactly, but it's not very clear for me actually. What should I test ? I have seen ...
13
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6answers
1k views
+50

What is the value of workflow tools?

I'm new to Workflow developement, and I don't think I'm really getting the "big picture". Or perhaps to put it differently, these tools don't currently "click" in my head. So it seems that companies ...
-4
votes
0answers
30 views

can someone explain me what does a <enum class>.values() functions actually do? [on hold]

I used a values() method in an enhanced for loop to traverse all values in my enum class. But what does this method actually do?
0
votes
3answers
247 views

Java 1.7 library with a Java 1.5 program - what are the options

I have a class library which is compiled with JDK 1.7 It uses several 1.7 features and classes and would be very difficult to get it recompiled in JDK 1.5. This needs to integrate with an old legacy ...
-3
votes
0answers
26 views

Java 1.6 on Eclipse: What does ERROR “annotation must be explicitly requested,” mean when creating new classes? [on hold]

I've copied code from a YouTube tutorial and for some reason the program terminates but it never renders the window. I've included Eclipse in firewall exceptions on Mac, I'm sure my system currently ...
4
votes
1answer
775 views

Attachment handling for web application with Jackrabbit

I need to manage attachments on my Spring web application and I thought to use an open source repository. My app it's a job approval system using J2EE / SPRING 3 Framework and Postgress DB to allow ...
2
votes
1answer
389 views

Push-Based Events in a Services Oriented Architecture

I have come to a point, in building a services oriented architecture (on top of Thrift), that I need to expose events and allow listeners. My initial thought was, "create an EventService" to handle ...
-6
votes
0answers
19 views

Link's massive in webdriver [on hold]

I want create script where the 1st step is to open a website and the 4th step is to click on a button. The button I want to take is from massive. I'm getting an exception. Can you help me or give me ...
-6
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0answers
26 views
-2
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0answers
46 views

transitioning from C# to Java. [on hold]

I have spent the last five years programming in C#/.net and have been transferred to a Java team. What are some of the things I need to watch out for? What are some of the more enjoyable things I ...
-4
votes
0answers
32 views

Any birdview article about Web development with Java? [on hold]

I am new to Java Web development. And I am tasked to create a prototype with Java and related technologies in a short time. So I am looking for some birdview article about the Web development ...
4
votes
3answers
229 views

Batching immutable object changes?

With immutable models, what would be the best way to batch several changes? For example, let's have a Book that is immutable. I need to change both title and year. I could change one by one, but that ...
7
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1answer
6k views

What have my fellow Delphi programmers done to make Eclipse/Java more like Delphi?

I am a veteran Delphi programmer working on my first real Android app. I am using Eclipse and Java as my development environment. The thing I miss the most of course is Delphi's VCL components and ...
23
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2answers
5k views

How to improve upon Bloch's Builder Pattern, to make it more appropriate for use in highly-extendable classes

I have been greatly influenced by Joshua Bloch's Effective Java book (2nd edition), probably more so than with any programming book I've read. In particular, his Builder Pattern (item 2) has had the ...
2
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1answer
602 views

How to translate SQL query into REST API requests?

Let's say I have a machine-readable description (such as in WADL, Swagger or RAML) of a REST API that provides interface to a database. My users submit queries about underlying database in form of ...
3
votes
1answer
963 views

Passing a Context around with dependency injection

In the project I'm working on, I'm using Guice and trying to do as much as possible with Dependency Injection. However, there's one little snag; many of my objects rely on an object Context. This is ...
2
votes
1answer
117 views

Why use a enum to create the singleton pattern [duplicate]

Why would you use an enum to create a singleton pattern? To what purpose would it serve over a conventional singleton pattern? I have seen the above used. The code uses an enum to create this pattern ...
4
votes
2answers
210 views

Is it better to use strings or int to reference enums outside the java part of the system?

We were having a discussion at my work about the use of enums in Java. A coworker was arguing that when using enums on the server-side, whenever required we should use string to reference to it (for ...
2
votes
1answer
27 views

Applying initialization-on-demand holder idiom at variable level rather than class

I was looking for the idiomatic way to implement thread-safe lazy initialization for a configuration collection retrieved from the DB inside a Spring bean. I decided to adapt the ...
-3
votes
3answers
69 views

Simple project ideas [on hold]

I am looking for simple project ideas to help teach some of my fellow students. I am trying to team them the following: -If / else if / else -For and while loops -Logical AND / OR -creating ...
9
votes
5answers
2k views

Is try-finally expensive

In case of code where you have to do a resource cleanup before exiting a function, is there a major performance difference between these 2 ways of doing it. Cleaning the resource before every return ...
-2
votes
2answers
100 views

What is a good name for a class that interacts with a command line tool? [on hold]

I'm writing a program in Java that includes a component that will interact with command line tool. In particular, I want to automatically process some data from an open-source GitHub project, so one ...
25
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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?
0
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1answer
67 views

Continuous Integration for different languages [on hold]

So, I understand Continuous Integration in theory, and have used Beanstalk. However, I've been charged with creating the process at my current PHP shop. My hope was maybe PHPCI, since it looked ...
0
votes
1answer
133 views

Is Default Package included in the Package Level Access?

I would like to know how the default package is defined in Java.I know how public and private access is defined but I don't know whether there is any default package access that is defined in package ...
0
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0answers
3 views

Cannot find bug in NegaMax implementation for java chess game [migrated]

I am having trouble identifying the error in my negamax implementation. It is not properly assigning the correct score except for ply 0 where it works. Obvious "pawn capture Rook" opportunities are ...
0
votes
1answer
25 views

Best approach to implement an update operation of a container object?

I have an Invoice object wich may contain several FacturedServices objects stord as a list. In may interface, the user can edit an Invoice object, delete add or edit its FacturedServices list. Whe ...
-4
votes
1answer
33 views

Field being skipped on use of Scanner .next() method and spaces being left out [closed]

I have a class called Student containing certain fields and I was using the following details to enter the values in its fields: Scanner s1=new Scanner(System.in); Student[] s=new ...
0
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0answers
70 views

Dealing with several custom getters

I have a data structure with data units containing different types of data. I've wrapped the data in "Field" objects so that each field is able to independently parse user input in a desired way. ...
1
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1answer
174 views

Best OOP pattern to use for creating a commandline SQL API for a proprietary json based company datastore

We need to create a SQL commandline tool for querying a proprietary json based datastore. I'll be using java. Any suggestions on the primary OOP design pattern I should use for building this API? ...
-2
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0answers
31 views

A library to be able to reproduce mp3 files in Raspberry Pi [closed]

I've been having a hard time looking for a simple library to reproduce audio files (mp3 precisely) , i've tried pyglet for python, but didn't succeed, but look, the only thing i want/need is a library ...
-1
votes
0answers
51 views

What else can kill a JVM? [closed]

When A JVM (Java process) dies unexpectedly, it can be an inside job (OutOfMemoryException, or OOME) or it could be from an external stimulus. As far as internal mechanisms go: Any uncaught ...
0
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2answers
112 views

When should we work on GC optimiation?

So, I've learnt about how GC works and how can I monitor it via VisualVM, but my question is about why we should ever perform GC optimization? In our web project (JSF/Spring/Hibernate) we haven't ...
-5
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0answers
59 views

Should I learn Java or Javascript? [closed]

I am a college graduate living in Southern California with a very basic understanding of java and programming in general. If my goal were to get my first job(or internship) as soon as possible, which ...
-5
votes
0answers
43 views

which language is best to learn [closed]

i know c,c++,html&css and basic java-script , i want to know that for which next language i should go for? i am totally confuse in ruby,java,php,asp,python,.net which should i start learning?? I ...
-2
votes
2answers
126 views

Why public access level method get overridden in java?

This question is raised with a clarification required to decide when to declare a method protected or public during class design of a package. My point is, if one needs to override a method of a ...
-1
votes
0answers
37 views

Persisting state of current execution in Java

I have specific use case, and I'm looking for opinion and suggestions on implementing this in Java as I'm fairly new to this. I have a dependency graph kind of process. The entity E in the processing ...
0
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0answers
26 views

Structure of Input Events [closed]

I know there are KeyListeners, MouseListeners, and AnyListeners everywhere. However, that is on the higher level. I want to know what the base of it all is. The lowest-level you can get ...
4
votes
3answers
230 views

Why use arg type `class Object` instead of `Comparable[]`?

In the code below, I believe it would look more appropriate to make the method argument be of type Comparable[] instead of Object[]. The first reason it would be more appropriate is that one can be ...
0
votes
2answers
154 views

Java card game design decision

I am making an application for a card game, with a standard 52-deck playing card. For now, I am writing a solitaire game with for learning purposes. I've had some experience making platformers and ...
0
votes
1answer
232 views

Is factory pattern a right pattern for the situation described here?

Is factory pattern a right pattern when we want to consolidate the related objects? Problem - In the Set-top box, I have a user-io, basically the interface to control the settop box - The user-io can ...
1
vote
2answers
191 views

Should CountDownLatch be used for waiting for an event?

I have a situation here, where I have a loop that loops x amount of times. The value x is determined by the user. Everytime it loops, I want it to wait for a button click before continuing the loop. ...
-3
votes
0answers
79 views

What is the use of Runnable r = new Runnable(); [closed]

I have seen this used but I don't know why it is used. Shouldn't the main method be the entrance point in an application?...
0
votes
0answers
44 views

All pair algorithm implementation [closed]

I need to know how to implement all pair algorithm in java... i am newbie for this kind of algorithm implementation .kindly help me with some suggestion. I have to generate possible test cases for ...
0
votes
1answer
67 views

Matrices calculations on partial shape matching

I'm working in a shape recognition project where it is supposed for me to develop an application that receives two images: an original one and a sketch made by a user. I am supposed to detect contours ...
0
votes
1answer
198 views

2D Game Data Structure in OpenGL ES 2.0

I'm trying to come up with some data structures for rendering my map on OpenGL. It is going to be ~ 100x100 blocks(squares) total, with each block being around 100 pixels. However, the screen will ...