Java Generic Learning notes-(iii) Generic methods

A generic method is similar to a generic class in that it defines a generic as a method, and the format is presumably:
　　Public < Type parameters > return type method name (generic type variable name) {...}
The generic method is also divided into dynamic methods and static methods:
1. Dynamic generic methods I've actually used it in the previous blog post,

1  Public classBox<t> {2 3     PrivateT obj;4     5      PublicBox () {}6 7      PublicT getobj () {8         returnobj;9     }Ten One public   void  setobj (T obj) {A. obj =  obj; -  }  -  the      PublicBox (T obj) { -         Super(); -          This. obj =obj; -     } +  -}

The Setobj () is a generic method that uses only the generic parameters provided in the class. We can also define our own generic parameters for a generic method:

1  Public class Box<t> {23/     *... */ 4 5      Public void print (q q) {6        System.out.println (q); 7     }89 }

Note: Generic parameters are defined before the return value type.
This allows us to specify its own generics when the method is called:

1 New Box<>(); 2 b.<string>print ("Hello"); 3 //  //  Compile error

2. Static generic methods must specify their own type parameters when used, because static methods are loaded as the class loads. When a static method is loaded, there is no instance object for the class, so the type parameters provided by the class cannot be used:

 1  public  class  Box<t> 2  3  ...< /span>*/ 4  5  public  static  <Q>  print (q q) { 6   System.out.println (q); 
      7   " 8  9 } 

It is used in a similar way to dynamic methods.
3. Note : When calling a generic method that has its own type parameter specified, it is not necessary to explicitly specify its generic, and Java can infer the type of the generic at compile-time, such as:
Dynamic:

1 b.print ("Hello");

Static:

1 box.print ("Hello");

Because the incoming type is obviously a string, it is no longer specified.

Java Generic Learning notes-(iii) Generic methods