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Uses for Optional
Having been using Java 8 now for 6+ months or so, I'm pretty happy with the new API changes. One area I'm still not confident in is when to use Optional . I seem to swing between wanting to use it everywhere something may be null , and nowhere at all.
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Spring MVC: How to perform validation?
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}
Method 1 : If you have Spring 3.x+ and simple validation to do, use javax.validation.constraints annotations (also known as JSR-303 annotations).
public class User {
@NotNull
private String name;
...
}
You will need a JSR-303 provider in your libraries, like Hibernate Valida...
Java switch statement: Constant expression required, but it IS constant
So, I am working on this class that has a few static constants:
13 Answers
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Protecting Java Source Code From Being Accessed [closed]
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Any Java IDE can format the code removing all invisible characters ;-) Still the morse-code idea is nice :-)
– Prakash K
Apr 17 '13 at 15:03
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Android 4.1: How to check notifications are disabled for the application?
... int uid = appInfo.Uid;
try {
var appOpsClass = Java.Lang.Class.ForName("android.app.AppOpsManager");
var checkOpNoThrowMethod = appOpsClass.GetMethod(CHECK_OP_NO_THROW,Java.Lang.Integer.Type,Java.Lang.Integer.Type,new Java.Lang.String().Class);//need to add St...
Setting property 'source' to 'org.eclipse.jst.jee.server:JSFTut' did not find a matching property
...clipse, the logging.properties file used by default is the JDK default at %JAVA_HOME%/jre/lib/logging.properties
If you want to use a different logging.properties file (e.g. in the tomcat server's conf directory), this needs to be set via the java.util.logging.config.file system property. e.g. to u...
Should I use @EJB or @Inject
...nce between @Inject and @EJB but I did not get any wiser. I have not done Java EE before nor do I have experience with dependency injection so I do not understand what I should use?
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How to use regex in String.contains() method in Java
...com%2fquestions%2f15130309%2fhow-to-use-regex-in-string-contains-method-in-java%23new-answer', 'question_page');
}
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Installing R with Homebrew
...sl, gcc
There are two additional options you might want to know:
--with-java
Build with java support
--with-openblas
Build with openblas support
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How to sort List of objects by some property
...Scores().get(0).compareTo(o1.getScores().get(0));
}
});
With Java 8 onwards, you can simply use lambda expression to represent Comparator instance.
Collections.sort(scores, (s1, s2) -> { /* compute and return int */ });
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