That’s because a long is 64 bits and an int is 32 bits, not to mention you’re going from floating-point to integer. To go from long to int, you’re going to have to discard some information, and the compiler can’t/won’t do that automatically. You’re going to have to explicitly say so through a cast: Alternatively, you can use java.util.Random:
In your classpath you’re using an absolute path but you’ve moved the project onto a new machine with quite possibly a different file structure. In your classpath you should therefore (and probably in general if you’re gonna bundle JARS with your project), use relative pathing: In your .classpath change to
If I’m not mistaken, 0.5 are decimal numbers; thus, making it a float value. You should not rely solely on your intuition when learning a new programming language. In fact, 0.5 is a double literal. For a float literal you need to write 0.5f. As The Java Language Specification (JLS 3.10.2) states: A floating-point literal is of type float if it is suffixed with an ASCII letter F or f; otherwise … Read more
The uses unsafe or unchecked operations warning is displayed when you execute code which the Java compiler considers to be lacking in error-checking, or potentially unsafe in some way. However, it’s a warning, not an error, and will not stop your code from compiling — large projects will often churn out warning after warning, and you’re free … Read more
To generate a random value between rangeMin and rangeMax:
Yes, you’ve downloaded and installed the Java Runtime Environment (JRE) instead of the Java Development Kit (JDK). The latter has the tools.jar, java.exe, javac.exe, etc.
I just want to create an object of class, but got this error when debugging. Can anybody tell me what the problem is? The location of this code is in some Spring(2.5) Service class. There is a similar problem: OJB Reference Descriptor 1:0 relationship? Should I set auto-retrieve to false? Thanks a lot~
I am currently studying Java and have recently been stumped by angle brackets(<>). What exactly do they mean? What does the <T> mean? Does it means that I can create an object of type T?
Cause of this error -You are trying to pass a primitive object into a generic type declaration whereas generic types always expect a Wrapper Class object. So please use ‘Boolean’ instead of ‘boolean’ in your code i.e. ‘B’ in caps.
I suspect you are simply having some problem in the actual file name of filename.txt, or you are running in a wrong directory.