Java-Aware generics

First, generics are the new features added after JDK1.5. Generics (Generic)

Avoids frequently occurring data type conversion exceptions

Second, generics can solve the security problem of data type, its main principle is that when the class declaration through an identity to represent the type of a property in a class or the return value of a method and the parameter type.

Third, format

Access Permissions class class name < Generics, generics ... >{property method}

Iv. Creation of objects

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

Five, the Code demonstration

Class Point<t>{private T x;private T y;public T GetX () {return x;} public void SetX (T x) {this.x = x;} Public T GetY () {return y;} public void Sety (T y) {this.y = y;}} public class GenericDemo01 {public static void main (string[] args) {point<string> PS = new point<string> ();p S. SetX ("Longitude is ten");p s.sety ("Latitude of 100"); System.out.println (Ps.getx () + "" +ps.gety ()); point<integer> PI = new point<integer> ();p I.setx (Ten);p i.sety (100); System.out.println ("Longitude:" +pi.getx () + "Latitude:" +pi.gety ()); point<float> PF = new point<float> ();p f.setx (10.0f);p f.sety (100.0f); System.out.println ("Longitude:" +pf.getx () + "Latitude:" +pf.gety ());}}

Execution Result:

Longitude is 10 latitude is 100 Longitude: 10 Latitude: 100 Longitude: 10.0 Latitude: 100.0

Java-Aware generics