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58. As you describe, @Override creates a compile-time check that a method is being overridden. This is very useful to make sure you do not have a silly signature issue when trying to override. For example, I have seen the following error: private String id; public boolean equals(Foo f) { return id.equals(f.id);}
Nov 17, 2008 · Java and C# have somewhat different ideas of enums. Java's are much more object-oriented. Java has no preprocessor directives (#define, #if etc in C#). Java has no equivalent of C#'s ref and out for passing parameters by reference. Java has no equivalent of partial types. C# interfaces cannot declare fields.
Oct 9, 2012 · You can use an enum type in Java 5 and onwards for the purpose you have described. It is type safe. A is an instance variable. (If it has the static modifier, then it becomes a static variable.) Constants just means the value doesn't change. Instance variables are data members belonging to the object and not the class.
The idea making the inner classes static, is to take the advantage of instantiating the objects of inner classes without instantiating the object of the top level class. This is exactly the same way as the static methods and variables work inside of a top level class. Hence Java Supports Static Classes at Inner Class Level (in nested classes ...
To raise an exception, simply pass the appropriate instance to throw, normally: throw new MyFormatExpcetion("spaces are not allowed"); -- you could even use the standard ParseException, without "creating" a custom exception type. – user166390. Dec 7, 2011 at 22:55. @pst Good point.
