All Questions
17 questions
276
votes
14
answers
125k
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 ...
- 2,657
2
votes
4
answers
3k
views
I wrote a class with "init" method. Should I call it from other class methods? Or leave it to the object user? (Code Design)
I have a java class with an init method. It's different from the constructor. The constructor just initializes the variables/fields. The init method connects to a database and performs some ...
- 131
59
votes
9
answers
49k
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;
}...
- 6,824
38
votes
5
answers
9k
views
When should I extend a Java Swing class?
My current understanding of Inheritance implementation is that one should only extend a class if an IS-A relation is present. If the parent class can further have more specific child types with ...
- 491
-1
votes
2
answers
262
views
Do I really need TaskManager class? [duplicate]
Background:
I'm coding an app, the core idea is simple - I can choose a 'Task' (consists of name, code to perform aka Runnable, progress) through GUI, start it, stop it, start all 'Task's and stop all ...
- 33
7
votes
3
answers
10k
views
Are there any drawbacks to using a nested class instead of declaring a new one?
I'm doing code review on a change my co-worker made to our Java application, and I've found something I'm not very familiar with - a nested class.
From reviewing the code, it seems like the nested ...
- 1,602
56
votes
3
answers
74k
views
Which is a better practice - helper methods as instance or static?
This question is subjective but I was just curious how most programmers approach this. The sample below is in pseudo-C# but this should apply to Java, C++, and other OOP languages as well.
Anyway, ...
- 663
2
votes
5
answers
1k
views
What should a constructor contain?
What should a constructor contain?
In both cases, all three arguments are needed for the class to work.
Which approach is better and why?
1)
class Language {
LanguageRepository ...
- 31
5
votes
2
answers
8k
views
Design pattern for processing a huge CSV file -- Java
I am learning design patterns in Java and also working on a problem where I need to handle huge number of requests streaming into my program from a huge CSV file on the disk. Each CSV line is one ...
- 61
10
votes
4
answers
3k
views
What are the responsibilties of the main in object oriented programming?
I'm new to object oriented programming and I don't understand what's the purpose of the main.
Yes, I read that it's the "entry point" of the program but what I don't understand is what should be in ...
- 221
1
vote
7
answers
4k
views
Repeated Instantiation of the Same Class in a Method
This is sort of a follow up question on Multiple Same Object Instantiation.
And I think, is not really language specific, so this is applicable to Java and C#?
Version A
public MyClass {
public ...
- 21
8
votes
3
answers
63k
views
Multiple Same Object Instantiation
What exactly happens in Java when you instantiate the same object multiple times?
For example:
Test test = new Test();
then later on I will call it again, Test test = new Test(); again or inside a ...
- 213
2
votes
1
answer
274
views
Is it OK to deprecate methods that need to be public due to the packaging model but are not to be used outside the codebase in Java?
I am currently working on a semi-large project that has several packages. There are 3 main packages, a "client" package, a "server" package and a "common" package. There are two jars, one for the ...
- 889
3
votes
2
answers
3k
views
Using MVC style, where is the best place to put SQL functionality?
I am wondering about best practices here.
MVC (Model - View - Controller) patterns involve separating components of your program that model the data, manipulate those models, and display those ...
- 3,028
0
votes
2
answers
15k
views
How to update an existing excel file using java program? [closed]
I've made a file browser in java that opens and read already been made excel files. (using Apache poi 3.9 library)
program read those files perfectly but i want to update some of those files. how can ...
