Convert double to float in Java
Just cast your double to a float. Also notice that the primitive types can NOT store an infinite set of numbers:
java
What’s the equivalent of Java’s Thread.sleep() in JavaScript?
The simple answer is that there is no such function. The closest thing you have is: Note that you especially don’t want to busy-wait (e.g. in a spin loop), since your browser is almost certainly executing your JavaScript in a single-threaded environment. Here are a couple of other SO questions that deal with threads in JavaScript: JavaScript … Read more
Spring Boot – Cannot determine embedded database driver class for database type NONE
You haven’t provided Spring Boot with enough information to auto-configure a DataSource. To do so, you’ll need to add some properties to application.properties with the spring.datasource prefix. Take a look at DataSourceProperties to see all of the properties that you can set. You’ll need to provide the appropriate url and driver class name:
Simple timeout in java
Can anyone guide me on how I can use a simple timeout in java? Basically in my project I’m executing a statement br.readLine(), which is reading a response from a modem. But sometimes the modem isn’t responding. For that purpose I want to add a timeout. I’m looking for a code like:
IntelliJ IDEA “The selected directory is not a valid home for JDK”
Because you are choosing jre dir. and not JDK dir. JDK dir. is for instance (depending on update and whether it’s 64 bit or 32 bit): C:\Program Files (x86)\Java\jdk1.7.0_45 In my case it’s 32 bit JDK 1.7 update 45
How to know if a given string is substring from another string in Java
There is a contains() method! It was introduced in Java 1.5. If you are using an earlier version, then it’s easy to replace it with this:
JOptionPane Yes or No window
I am trying to create a message with a Yes or No button. Then a window will appear with a certain message that depends on if the user clicked Yes or No. Here is my code: Right now it prints HELLO whether or not you press Yes or No. How do I get it to … Read more
Class JavaLaunchHelper is implemented in two places
You can find all the details here: IDEA-170117 “objc: Class JavaLaunchHelper is implemented in both …” warning in Run consoles It’s the old bug in Java on Mac that got triggered by the Java Agent being used by the IDE when starting the app. This message is harmless and is safe to ignore. Oracle developer’s … Read more
C++ equivalent of java’s instanceof
Try using: This requires your compiler to have rtti support enabled. EDIT: I’ve had some good comments on this answer! Every time you need to use a dynamic_cast (or instanceof) you’d better ask yourself whether it’s a necessary thing. It’s generally a sign of poor design. Typical workarounds is putting the special behaviour for the … Read more
String cannot be resolved to a type – Java RAD
My guess is you miss the JRE Runtime Library in your project. But this would cause all the java.* classes to generate this message! Can you post your code so we can see what might be the problem? try doing : right-click on your project. ->properites ->java Build Path ->tab Librairies check if the JRE … Read more