Data dodania Pytanie
2017-02-10 03:02 Make function generic for List<Boolean> and boolean[] »
I have two functions which check if all elements of an array or list are true. I'm having trouble combining the two. How can I make the functions into...
(4) odpowiedzi
2017-02-09 18:02 Clean java programming, is it a bad idea to use lambdas to generate method input parameters? »
Just a quick question regarding good programming practices, Performance aside, how much of a good/bad idea could something like this be? I am oversim...
(1) odpowiedzi
2017-02-09 17:02 Why can't Stream.flatMap accept a collection? »
Given the following as an example of data classes: class Country { List<Region> regions = new ArrayList<>(); List<Region>...
(1) odpowiedzi
2017-02-09 15:02 CSRF implementation in .jsp webapplication »
To protect my web application I implemented the following counter measures: Upon login, the user's request is processed through my Authorization Filt...
(0) odpowiedzi
2017-02-09 13:02 How to prevent CSRF attack in Spring mvc 4 »
I have java spring mvc project. I wanted to know how to protect my webApp from CSRF .I have read , Spring handles that default, does that mean I don't...
(1) odpowiedzi
2017-02-09 11:02 Why does this generic code in java compile? »
public static <T> T foo(T x, T x2) { return (T) (x + " " + x2); } public static void main(String args[]) { System.out.println(foo(33,...
(2) odpowiedzi
2017-02-09 04:02 Java 8 Comparator comparing doesn't chain »
Let's say I have a Pair class public class Pair<P, Q> { public P p; public Q q; public Pair(P p, Q q) { this.p = p; ...
(2) odpowiedzi
2017-02-08 16:02 Using java streams to put the last encountered value into a map »
I have some code as follows: Map<RiskFactor, RiskFactorChannelData> updateMap = updates.stream().filter(this::updatedValueIsNotNull). // Re...
(2) odpowiedzi
2017-02-08 15:02 What are jvm pre-allocated exceptions? »
I see references to pre-allocated JVM exceptions there: - http://www.oracle.com/technetwork/java/javase/relnotes-139183.html - http://dev.clojure.org/...
(2) odpowiedzi
2017-02-08 14:02 How to handle authentication popup in Chrome with Selenium WebDriver using Java »
I am trying to handle an authentication pop-up in one of my new Webdriver scripts. I have a working solution for IE, but I am struggling with Chrome....
(1) odpowiedzi
2017-02-08 13:02 Passing non final objects to method references »
What is the explanation that s.get() returns "ONE" the second time as well? String x = "one"; Supplier<String> s = x::toUpperCase; System.out.p...
(6) odpowiedzi
2017-02-08 12:02 loading inner class without loading the enclosing class »
I was bit confused when is the inner class (non static) gets loaded by the jvm . Is it dependent on the outer class. or can it be separately loaded w...
(1) odpowiedzi
2017-02-08 09:02 What's the correct way to escape the ? character in a JDBC PreparedStatement when using Oracle 12c MATCH_RECOGNIZE? »
The following query is correct in Oracle 12c: SELECT * FROM dual MATCH_RECOGNIZE ( MEASURES a.dummy AS dummy PATTERN (a?) DEFINE a AS (1 = 1) )...
(1) odpowiedzi
2017-02-08 08:02 What is the standard approach in Java »
I was given a task for coding a Java program for exporting database table records to flat files. I am confused with the approach my lead suggests to...
(0) odpowiedzi
2017-02-07 19:02 How does Apache Spark send functions to other machines under the hood »
I started playing with Pyspark to do some data processing. It was interesting to me that I could do something like rdd.map(lambda x : (x['somekey'],...
(2) odpowiedzi
2017-02-07 16:02 Why does a subclass of an inner class require an enclosing instance? »
Consider class OuterClass which has InnerClass public class OuterClass { class InnerClass { } } And the second class, which is trying to e...
(4) odpowiedzi
2017-02-07 16:02 API Laravel through Java application »
I have a LARAVEL API coded in PHP with MYSQL Database but i want to create a Desktop App for few users, but for this i have to call my API with token ...
(0) odpowiedzi
2017-02-07 14:02 OutOfMemoryError: Java heap space when trying to read 5 ints into an array »
I am practicing for Java fresher interview coding examples. I am trying to write a program to find duplicate numbers between 1 to N, where N is given ...
(3) odpowiedzi
2017-02-07 14:02 What's the correct way to fetch all (possibly implicit) results from an Oracle query with JDBC? »
Since Oracle 12c, we can fetch implicit cursors from clients. For instance, it is possible to run the following PL/SQL anonymous block in SQL Develope...
(1) odpowiedzi
2017-02-07 14:02 Is it considered bad to not use the API? »
When I started programming in Java, I was taught to always use the API and not reinvent the wheel by writing an own implementation of an already exist...
(1) odpowiedzi
2017-02-07 09:02 @NotNull on subclass getter affects parent class table »
I have a question related to javax.validation.constraints.NotNull annotation. In my project i do have classes tree like following : @Inheritance(stra...
(3) odpowiedzi
2017-02-07 03:02 Why/When you would not want to have Java 8 UseStringDeduplication enabled in JVM? »
Java 8 introduced String Deduplication that can be enabled by launching JVM with -XX:+UseStringDeduplication option allowing to save some memory by re...
(2) odpowiedzi
2017-02-06 23:02 SSLSocket via another SSLSocket »
I'm trying to create an SSLSocket on top of another SSLSocket in an Android app. The lower connection is an SSL-secured connection to a Secure Web Pro...
(1) odpowiedzi
2017-02-06 21:02 Difference between multiple System.out.print() and concatenation »
Basically, I was wondering which approach is better practice, for(int i = 0; i < 10000; i++){ System.out.print("blah"); } System.out.println("...
(5) odpowiedzi
2017-02-06 15:02 Pass class type as parameter to use in ArrayList? »
I need to write a java method which takes a class (not an object) and then creates an ArrayList with that class as the element of each member in the a...
(3) odpowiedzi
2017-02-06 14:02 Unable to fetch ID using Postgres Stored Function - Bad value for type int »
I am trying to get location information from the schema Location. Postgres version is 9.3.15 and maven jar used is 9.4-1200-jdbc4 ubuntu 14.04 LTS. F...
(1) odpowiedzi
2017-02-05 17:02 Why is AtomicInteger needed if writes and reads to int variables are atomic? »
I've read in Oracle docs that: Reads and writes are atomic for reference variables and for most primitive variables (all types except long an...
(4) odpowiedzi
2017-02-05 17:02 Memory allocation problems with android application »
I have an android application that performs image analysis, which is managed with an IntentService - the process takes a couple of seconds each time a...
(2) odpowiedzi
2017-02-05 13:02 google app engine taking too much time in giving response from endpoint android »
In my android project i have started building google cloud endpoints. But the response time is very slow. It is taking 21 seconds to fetch the respons...
(1) odpowiedzi
2017-02-05 12:02 Concern regarding piece of code »
I was looking at one of the open source project on github and I found following line of code in Java, static byte[] byteArray = new byte[1 << 1...
(1) odpowiedzi
2017-02-05 12:02 How to prevent auto-backup of an Android app? »
I face very weird situation on certain device (Nexus 5x with Android 7): when I clean its data and uninstall it, then install it with Studio, the app ...
(2) odpowiedzi
2017-02-05 11:02 android : adding SearchView inside a ListView with Custom Adaptor »
I'm creating a an app with 3 tab fragments . this is one of the fragments,, the data is shown in list-view. Im facing trouble in adding a search filte...
(2) odpowiedzi
2017-02-05 09:02 Method overloading : Single parameter vs alternating parameters »
This question might be similar to Java overload confusion I'm reading a book and there's a topic regarding method overloading from which a compiler m...
(2) odpowiedzi
2017-02-04 17:02 JNA two dimensional arrays »
I try to call a short** in C with JNA. The C looks like this: void compute(short** in, int row, int col) { for (int i = 0; i < row; i++) { ...
(1) odpowiedzi
2017-02-04 16:02 Is using Optional in Scala's case classes and classes fields a code smell? »
There were already quite a few discussions on Stackoverflow about proper ways of using Optional in Java (Discussions like this one, or this) As of n...
(2) odpowiedzi