Java object-oriented---generics

Concept

Generics solve the security problem of data types by identifying the type of a property in a class or the return value and parameter type of a method at the time the class is declared.

Format

Access Permissions class class name < Generics, generics ... >{

Property

Method

｝

Sample code

Class gnericity<t,g...>{ private T i;　　void SetI (T i) { this.i = i;　　} Public T Geti () { return i; }}

Creation of objects

Class name < concrete type > Object name = new class name < concrete type > ();

Sample code

New Gnericity<string> ();

wildcard character "? ”

Used when parameters are passed in a method. Class of generics to be used, passed as parameter in the method

Sample code

 Public void wildcard (gericity<?> gericity) {
Method Body}

Generic interface

Sample code

Interface genricity<t>{}

Java object-oriented---generics