All Questions
Tagged with javaperformance
91 questions
1vote
1answer
206views
Best way to merge files in java [closed]
I have a task to merge set of files and each file contains words ( separated by new line ). Files contains words in sorted order. Once merged all the files, it needs to preserve the sorted order. ...
- 119
0votes
1answer
2kviews
Java: Is there a performance difference between variable assignment vs. inline usage?
Is there any performance detriment to assigning variables vs using them inline. I'm guessing this WOULD be worse if a method was returning primitive and I was 'boxing' it (e.g. method returning int, ...
- 311
1vote
1answer
197views
Feature Store Design for input data like JSON, CSV and Excel
I need a design approach for a feature store which accepts input data in the forms of CSV, EXCEL, JSON etc. The backend stack we support is Java, Spring boot and oracle DB. Note : Each file ...
- 113
-6votes
1answer
160views
Are aspects of domain driven design limiting when we scale?
From what I have read about the domain driven design, an aspect of it is that there is a clear separation between domain objects and DTOs. So the application level components deal with domain objects ...
- 359
0votes
1answer
828views
Efficiency in Java: Object reference vs id reference
I have to represent a certain data structure, in which I have nodes that are related between them. Each node has its numeric id, and a list containing the next directly related nodes and another list ...
- 167
-2votes
1answer
26views
Filtering the Data and summing on one field Should I do in JAVA or write query with aggregate query with filter clause?
I have one table in which there would be millions of records. The requirement is to the records based on the condition and then total on one of the fields. Selectivity would be around approx 50. ...
2votes
1answer
938views
When is creating a supplier for an object less expensive than creating the object itself?
Objects contains 2 method overloads where one takes an object and the other takes a Supplier of that object: public static <T> T requireNonNull(T obj, String message) public static <T> T ...
- 272
0votes
1answer
130views
Simple but frequently throwing vs reasonable but rarely throwing vs complex but never throwing [duplicate]
A lot of code that's designed to convert or parse some data of type Foo into a Bar is written with the assumption that one wouldn't intentionally pass it invalid inputs. As such, it assumes that ...
0votes
4answers
299views
Improvements in java based test framework to reduce execution time
Let me give a bit of background on the problem. We have a java application which has MQ integration and an Integration Test pack which is also written in java. The test pack runs all scenarios (...
- 137
0votes
0answers
346views
Best way to reduce memory consumption on persisting Java objects
Let's say I have an application that maintains relationships between objects - think of a parent-child relationship tree. The lineage of these objects are critical, so maintaining references from ...
- 263
-3votes
1answer
99views
Web-Application with file generation pattern
I work on a java web-application. In this application, users can generate some reporting (xls/pdf) and create some pack of multiple reporting. (using pdfbox, itext) More and more data are added in ...
4votes
3answers
2kviews
How useful is JNI in android?
In java/android we can call code written in the c/c++ language for execution speed advantage. I have heard of Ahead Of Time compilation which (as far as i know) compiles the entire application to ...
- 151
1vote
1answer
1kviews
Is new object creation necessary with BigDecimal?
Problem description: I am running performance test of calculation of PI number with primitives and with BigDecimal class. Calculation of PI with primitives is around 5-6 times faster than the same ...
- 257
0votes
1answer
267views
Which is better in terms of performance (bool01==bool02) vs (bool01 && bool02) [duplicate]
Which of these two is the better way of doing the same thing - public void someMethod(String s, boolean bool02){ boolean bool01 = s!=null; if(bool01==bool02){ doSomething(); } } OR public void ...
- 127
-3votes
1answer
339views
What are the pros and cons of using a named binary format as opposed to an unnamed one?
I'm curious to know are there any advantages or disadvantages to creating a named binary format as opposed to an unnamed one? I can only think of a increase in the required disk space. Roughly ...
- 262
