15.4匿名内部类泛型

泛型还可以应用于匿名内部类中<br />    列：泛型在匿名内部类中的使用。（排队场景）

public interface Generator <T>{
   T next();
}
public class Generators {
    public static <T> Collection<T> fill(Collection<T> coll,Generator<T> gen,int n){
       for (int i=0;i<n;i++){
              coll.add(gen.next());
       }
       return coll;
    }

package com.package15;
import com.package15.coffe.Generator;
import com.package15.coffe.Generators;
import java.util.*;
class Customer{
     private static long count=0;
     private final long id=count++;
     Customer(){}
     @Override
    public String toString() {
        return "Customer"+id;
    }
    public static Generator<Customer> generator(){
         return new Generator<Customer>() {
             @Override
             public Customer next() {
                 return new Customer();
             }
         };
    }
}
class Teller{
    private static long coumt=1;
    private final long id=coumt++;
    Teller(){}
    @Override
    public String toString() {
        return "Teller"+id;
    }
    public static Generator<Teller> generator=new Generator<Teller>() {
        @Override
        public Teller next() {
            return new Teller();
        }
    };
}
public class BankTell {
    public static void server(Teller t,Customer c){
        System.out.println(t+" serves "+c);
    }
    public static void main(String[] args) {
        Random random = new Random(47);
        Queue<Customer> qurak = new LinkedList<Customer>();
        Generators.fill(qurak,Customer.generator(),15);
        List<Teller> tellers = new ArrayList<>();
        Generators.fill(tellers,Teller.generator,4);
        for (Customer customer : qurak) {
             server(tellers.get(random.nextInt(tellers.size())),customer);
        }
    }
}