It’s a static initializer. It’s executed when the class is loaded (or initialized, to be precise, but you usually don’t notice the difference). It can be thought of as a “class constructor”. Note that there are also instance initializers, which look the same, except that they don’t have the static keyword. Those are run in addition to the code in the constructor … Read more
java is part of the JRE, not the JDK. You need to add the JDK bin to the system PATH, in “Control Panel” | System | Advanced | “Environment Variables”
Try the following Rebuilding the project Cleaning the project Syncing with Gradle Files Closing the Project, closing AS and relaunching / reopening File > Invalidate Caches / Restart Double checking all support libraries are up to date in the SDK manager Exit Android Studio Back up your project Delete all the .iml files and the … Read more
Launch4j works on both Windows and Linux/Mac. But if you’re running Linux/Mac, there is a way to embed your jar into a shell script that performs the autolaunch for you, so you have only one runnable file: exestub.sh: Then you create your runnable file from your jar: It works the same way launch4j works: because a … Read more
You cannot overload operators in Java. The < operator only applies to primitive (or numeric) types, not reference types. Since T is a type variable that represents a reference type, you cannot use < on variables of type T. You have to use check the value returned and decide to do what you wish with … Read more
If you want that for display purposes, use java.text.DecimalFormat: If you need it for calculations, use java.lang.Math:
leading slash to denote the root of the classpath slashes instead of dots in the path you can call getResource() directly on the class.
When you create a new File, you are supposed to provide the file name, not only the directory you want to put your file in. Try with something like
I’ve been trying to install the jdk on my ubuntu after downloading it. first I’ve used: sudo apt-get update then: sudo apt-get install jdk* (because I didn’t want to write the whole long name). it didn’t work- printed the message in the title. I thought the problem might me with the directory I’m executing from … Read more
From your description I assume you are on windows machine and your home is abc So Now : Cause When you run this command keytool -genkey -alias tomcat -keyalg RSA because you are not specifying an explicit keystore it will try to generate (and in your case as you are getting exception so to update) … Read more