Java Beginner Note five: generics processing

First, the generic type:

Generic refers to a type of data that can be stored in a data type

1 ImportJava.io.*;2 ImportJava.nio.file.Files;3 Importjava.nio.file.Paths;4 Importjava.util.List;5 6 classMyclass<type>{7      Publictype[] tlist;8      PublicType TObject;9@SuppressWarnings ("Unchecked")TenMyClass (intMaxsize,type Object) { One          This. Tlist = (type[])NewObject[maxsize]; A          This. TObject =object; -     } -      PublicType Getmyobject () { the         return  This. TObject; -     }  -      Publictype[] Getmylist () { -         return  This. tlist; +     } -      Public voidSetmyobject (Type object) { +          This. TObject =object; A     }     at }   -  -  Public classtest{ -      Public Static voidMain (String args[])throwsIOException { -Myclass<string> Newone =NewMyclass<string> (5, "5"); - System.out.println (Newone.getmylist ()); in System.out.println (Newone.getmyobject ()); -Newone.setmyobject ("6"); to System.out.println (Newone.getmyobject ()); +     } -}

1, the knowledge point of the variable definition:

About the definition of a generic variable (non-array):

1 class myclass<t>{2public     T t; 3   MyClass (t newt) {4this     . t = Newt; 5   }    6 }

About the generic definition of the data:

1 @SuppressWarnings ("Unchecked")2 myClass (int  maxsize) {3 This     . Tlist = (type[])new  object[maxsize]; 4 }

2, the knowledge point 2--the generic type instantiation

Here you need to explicitly indicate the data type

1 New myclass<string> (5, "5");

Second, generic interface:

1  Public InterfaceMyinterface<t>{2            PublicT Next ();3 }4 //interface requires inheritance5  Public classMyClassImplementsmyinterface<string>{//explicitly defining a type when inheriting6           PrivateString[] Stringlist=Newstring[]{"A1", "B1", "C1"};7 @Override8            PublicString Next () {9Ramdom rand=NewRandom ();Ten                     returnStringlist[rand.nextint (3)]; One           } A}

Three, generic method:

1. Generic method under generic class:

Generic parameters:

1  Public void Show (T t) {2  System.out.println (t);   3 }

Generic return value

1  Public T GetObject () {2   return  This . T; 3 }

2, a separate generic method:

1  Public void out (T t) {2  System.out.println (t); 3 }

Java Beginner Note five: generics processing