Public void Show (T-t), what is the function of the generic t before void

Reprint content, original link: http://www.cnblogs.com/anrainie/archive/2012/03/09/2387272.html

Public <T> This T is a modifier, which means that it is a generic method , just like a static method.

<T> is not a return value, indicating that the passed-in parameter has a generic

public static <T>list<T> Aslist (T...A)

The first representation is a generic method, and the second indicates that the return value is a list type, and that the list has generics and can only store data of type T

examples of use of generic methods:

1 public <T> void Fromarraytocollection (t[] A, collection<t> c) {  
 2 for         (t t:a) {  
 3             c.add (t);  
 4         }  
 5     }  
 6   
 7   
 8 public void Fromarraytocollection (t[] A, collection<t> c) {  
 9         for (T t:a) {  
ten             C.add (t);  
One         }       

The first method is equivalent to declaring a class of type T for the method, and this method does not give an error in any of the classes.

The second method is equivalent to a class that has no declared type T, at which point the generic t must be added to the class, or the method will give an error.

1 package generic;
 2 
 3/**
 4  * Generic method Test
 5  * 
 6  * @author Caiyu
 7  * 
 8
 */9 public class Genmethod {
Ten 
public     static <T> void display (T t) {         System.out.println ( T.getclass ());
14}

First, a generic declaration must precede a value declaration after the method's modifier (public,static,final,abstract, etc.).

Then, as with a generic class, you can declare multiple generics, separated by commas.