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This article mainly introduces "what are the basic notes in java". In daily operation, I believe many people have doubts about what basic notes are in java. The editor consulted all kinds of materials and sorted out simple and easy-to-use methods of operation. I hope it will be helpful for you to answer the questions of "what are the basic notes in java?" Next, please follow the editor to study!

1. Java.lang.Override is a tag type annotation, which is used as an annotation method. It shows that this method inherits the method of the parent class, that is, it overrides the method of the same name in the parent class.

@ Overridepublic void onCreate (Bundle savedInstanceState) {. This is correct if you write @ Overridepublic void oncreate (Bundle savedInstanceState) {. .} the compiler will report the following error: The method oncreate (Bundle) of type HelloWorld must override orimplement a supertype method to ensure that you correctly override the onCreate method (because oncreate should be onCreate) and if you do not add @ Override, the compiler will not detect the error, but will assume that you have defined a new method for the subclass: oncreate

2. SuppressWarnings uses it to tell the compiler to ignore possible warnings.

In fact, there are a lot of parameters, different parameters set different warnings.

-deprecation, warning when using obsolete classes or methods-unchecked, warning when performing unchecked conversions-fallthrough, warning when switch block goes directly to the next case without break-path, warning when there is no path in classpath, source file path, etc.-serial, warning when serialVersionUID definition is missing on serializable classes-finally Any warning when the finally clause cannot be completed properly-all, this is the end of the warning about all of the above, and the study of "what are the basic notes in java" is over. I hope you can solve your doubts. The collocation of theory and practice can better help you learn, go and try it! If you want to continue to learn more related knowledge, please continue to follow the website, the editor will continue to work hard to bring you more practical articles!

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