Using bit arithmetic and then comparing with the greater than operator can lead to unexpected results (of course depending on the value of SWT. = 0' instead of ' Class implements Cloneable but does not define or use the clone method. SELECTED is a negative number, this is a candidate for a bug. SELECTED is not negative, it seems good practice to use '!This non-final class defines a clone() method that does not call super.clone().
If all clone() methods call super.clone(), then they are guaranteed to use Object.clone(), which always returns an object of the correct type.
This class defines a clone() method but the class doesn't implement Cloneable.
There are some situations in which this is OK (e.g., you want to control how subclasses can clone themselves), but just make sure that this is what you intended. In general, exceptions should be handled or reported in some way, or they should be thrown out of the method. In general, exceptions should be handled or reported in some way, or they should be thrown out of the method.
It's recommended to use the predefined library constant for code clarity and better precision. The entry Set() method is allowed to return a view of the underlying Map in which a single Entry object is reused and returned during the iteration.
As of Java 1.6, both Identity Hash Map and Enum Map did so.
When iterating through such a Map, the Entry value is only valid until you advance to the next iteration.If, for example, you try to pass such an entry Set to an add All method, things will go badly wrong. Random object, uses it to generate one random number, and then discards the Random object.This produces mediocre quality random numbers and is inefficient.If possible, rewrite the code so that the Random object is created once and saved, and each time a new random number is required invoke a method on the existing Random object to obtain it.If it is important that the generated Random numbers not be guessable, you not create a new Random for each random number; the values are too easily guessable.You should strongly consider using a java.security.