Javac -Xlint will show all warnings supported by javac compiler. If you are compiling using javac, then you won't see all of these warnings, until you compile using -Xlint option. If you are coding in Eclipse IDE, then you are likely to see many warnings as soon as you write code, which triggers any of these warnings. Now we will see, when these warnings occur and how does it help to minimize potential errors? In the last couple of paragraphs, we have seen what is and list of options supported by the javac compiler.

It seems IDE like Eclipse and Netbeans support more options than standard javac compiler.

Having said that, there are conditions, especially while using generics in Java, when you are absolutely sure that things won't go wrong, you can use to suppress those warnings.Īlso, worth following are advised given by Josh Bloch in his famous book Effective Java, a must read for every Java programmer, to document reason for suppressing a warning as a comment.ĭifferent compiler and IDEs support different list of options. Since indicates potential programming error or mistake, it's recommended to use them sparingly and instead try to fix actual problem which is triggering that warning. Former is used to suppress warning generated due to unchecked casting while the later warning is used to remind about adding SerialVersionUID in a Serializable class. You might have seen and two of most popular examples of annotation. For example, if a class is annotated to suppress a particular warning, then a warning generated in a method inside that class will also be separated. instruct the compiler to ignore or suppress, specified compiler warning in annotated element and all program elements inside that element. Annotation is one of the three built-in annotations available in JDK and added alongside in Java 1.5.

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