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This article mainly explains "what is the method of Java automatic packing". The content of the article is simple and clear, and it is easy to learn and understand. Please follow the editor's train of thought to study and learn "what is the method of Java automatic packing".

Sample code:

Manual packing, manual unpacking

Integer iOb=new Integer (100); / / manual packing int i=iOb.intValue (); / / manual unpacking System.out.println (I + "" + iOb)

Automatic packing, automatic unpacking

Integer iOb=1000;int iObscape system. Out.println (I + "" + iOb)

Static import: can be referenced directly through static member names

Import static java.lang.Math.sqrt

Comments (metadata): embed additional information in the java source file

@ Retention specifies the retention policy associated with the annotation. The retention policy determines how long the @ Documented tag annotation lasts during compilation and deployment, tells the tool that the annotation is documented @ Target specifies the declaration type of the application annotation @ Inherited tag annotation, so that the superclass annotation inherits the @ Override tag annotation from the self-class, the method of marking the annotation must override the superclass method @ Deprecated tag annotation, declaring that it is outdated and that the @ SafeVarargs tag annotation is not recommended Indicates that there is no unsafe action related to the variable length parameter of the method or constructor. @ SuppressWarnings forbids the compiler to issue a warning @ FunctionalInterface tag comment to annotate the interface declaration. @ Deprecated / / Mark a non-recommended class class MyClass {private String msg; MyClass (String m) {msg=m;} @ Deprecated / / mark a non-recommended method String getMsg () {return msg;}} public class AnnoDemo {public static void main (String [] args) {MyClass myObj=new MyClass ("test"); System.out.println (myObj.getMsg ());}}

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