unchecked

Is there anyone able to explain me this strange behavior? int i = 0x1234; byte b1 = (byte)i; byte b2 = (byte)0x1234; //error: const value '4660' can't convert to byte (use unchecked) byte b3 = unchecked((byte)0x1234); byte b4 = checked((byte)i); //throws byte b5 = (byte)(int)0x1234; //error: same as above NOTE: It's an empty Console application, with NO arithmetic checking enabled (as default is). Thank you everybody in advance. EDIT: I supposed to be clear enough, but not for all. I do know that a word can't fit into a byte. But, by default, a C# program allows certain "dangerous" operations,

I have a legacy webapp which uses jstl and Struts 1 tags. When I pre-compile the JSP files with Java 5/6, the jstl and Struts 1 tags throw warnings about "unchecked or unsafe operations". For example, if I use the following tag: <%@ page import="/anotherpage.inc" %> The following warning is thrown: [javac] Note: Some input files use unchecked or unsafe operations. [javac] Note: Recompile with -Xlint:unchecked for details. If I recompile with -Xlint:unchecked, I get details about the internal working of the offending JSP tag library. I would like to suppress all unchecked operation warnings. I

I have some questions regarding handling exceptions in Java. I read a bit about it and got some contradicting guidelines. Best Practices for Exception Handling Let's go through the mentioned article: It states that one should generally avoid using checked exceptions if "Client code cannot do anything" . But what does it exactly mean? Is displaying error message in GUI sufficient reason for bubbling up checked exception? But it would force GUI programmer to remember to catch RuntimeExceptions and their descendants to display potential error info. Second view presented in this article is that

I have some code with this structure: public void method() { Object o; try { o = new Object(); } catch (Exception e) { //Processing, several lines throw new Error(); //Our own unchecked exception } doSomething(o); } I have quite a few methods in which I have the same code in the catch block, so I want to extract it to a method so that I can save some lines. My problem is, that if I do that, I get a compiler error " The local variable o might not have been initialized". public void method() { Object o; try { o = new Object(); } catch (Exception e) { handleError(); } //doSomething(o); compiler

I'm getting a message when I compile my code: Note: H:\Project2\MyGui2.java uses unchecked or unsafe operations. Note: Recompile with -Xlint:unchecked for details. How do I recompile with -Xlint:unchecked ? sudocode Specify it on the command line for javac: javac -Xlint:unchecked Or if you are using Ant modify your javac target <javac ...> <compilerarg value="-Xlint"/> </javac> If you are using Maven, configure this in the maven-compiler-plugin <compilerArgument>-Xlint:unchecked</compilerArgument> Brian Burns For IntelliJ 13.1 , go to File -> Settings -> Project Settings -> Compiler -> Java

I work on a project with a legacy service layer that returns null in many places if a requested record does not exist, or cannot be accessed due to the caller not being authorized. I am talking about specific records requested by ID. For instance, something like: UserService.get(userId); I have recently pushed to have this API changed, or supplemented with a new API that throws exceptions instead. The debate over checked vs unchecked exceptions has ensued. Taking a note from the designers of JPA/Hibernate et all., I have suggested that unchecked exceptions may be most appropriate. My argument