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Why does int num = Integer.getInteger(“123”) throw NullPointerException?
...to (int) 123, you can use e.g. int Integer.parseInt(String).
References
Java Language Guide/Autoboxing
Integer API references
static int parseInt(String)
static Integer getInteger(String)
On Integer.getInteger
Here's what the documentation have to say about what this method does:
pub...
SQL Client for Mac OS X that works with MS SQL Server [closed]
...swer.
Native Apps
SQLPro for MSSQL
Navicat
Valentina Studio
TablePlus
Java-Based
Oracle SQL Developer (free)
SQuirrel SQL (free, open source)
Razor SQL
DB Visualizer
DBeaver (free, open source)
SQL Workbench/J (free, open source)
JetBrains DataGrip
Metabase (free, open source)
Netbeans (free,...
Use of Initializers vs Constructors in Java
So I've been brushing up on my Java skills as of late and have found a few bits of functionality that I didn't know about previously. Static and Instance Initializers are two such techniques.
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java: (String[])List.toArray() gives ClassCastException
... IntelliJ, I get a warning to use toArray(new String[0]) rather: "In older Java versions using pre-sized array was recommended as the reflection call which is necessary to create an array of proper size was quite slow. However since late updates of OpenJDK 6 this call was intrinsified, making the pe...
How to use the same C++ code for Android and iOS?
.... All shared code is in this segment. The highest level is regular Obj-C / Java / Kotlin code, no news here, the hard part is the middle layer.
The middle layer to iOS side is simple; you only need to configure your project to build using a variant of Obj-c know as Objective-C++ and it is all, you ...
Is there any performance reason to declare method parameters final in Java?
Is there any performance reason to declare method parameters final in Java?
5 Answers
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Java Swing revalidate() vs repaint()
...e() or revalidate() is mandatory when you do a remove() - see the relevant javadocs.
My own testing indicates that repaint() is also necessary. I'm not sure exactly why.
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Error starting jboss server
... attribute to the parameter tag):
<constructor><parameter class="java.io.File"><inject …
The original version doesn't have the class="java.io.File" attribute.
Pretty sloppy of the JBoss folks, but there you go.
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How to view hierarchical package structure in Eclipse package explorer
...contain only one subpackage) Remark: just saw that i have "Eclipse IDE for Java Developers" on my laptop whilst having "Eclipse Java EE IDE for Web Developers." on my desktop.
– raudi
Aug 10 '11 at 14:01
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Java : Comparable vs Comparator [duplicate]
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