java 泛型深入之Set实用工具各种集合泛型深入使用示例，匿名内部类、内部类应用于泛型探讨 - JAVA

ze, values] ------HashMap--------------------------- HashMap extends:Map object:[] interfaces in:HashMap result:[Map, Cloneable, Serializable] ------LinkedHashMap--------------------------- LinkedHashMap extends:HashMap object:[] interfaces in:LinkedHashMap result:[Map] ------TreeMap--------------------------- TreeMap extends:Map object:[pollLastEntry, firstKey, floorEntry, ceilingEntry, lowerEntry, lastEntry, subMap, tailMap, navigableKeySet, higherEntry, lowerKey, headMap, firstEntry, comparator, descendingKeySet, descendingMap, pollFirstEntry, lastKey, higherKey, floorKey, ceilingKey] interfaces in:TreeMap result:[NavigableMap, Cloneable, Serializable] ------SortedMap--------------------------- SortedMap extends:Map object:[tailMap, firstKey, headMap, comparator, lastKey, subMap] interfaces in:SortedMap result:[Map] */
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//Generator.java
package org.rui.generics.anonymity;

public interface Generator
  
    {

	//返回泛型的内型对象
    T next();
	
}

//Generators.java
package org.rui.generics.anonymity;

import java.util.Collection;
/**
 * 利用生成器很方便的填充一个collection
 * @author lenovo
 *
 */
public class Generators 
{
  public static
  
    Collection
   
     fill(Collection
    
      coll,Generator
     
       gen,int n) { System.out.println("gen.next():"+gen.next()); for(int i=0;i
      
       
 
       //BankTeller.java
package org.rui.generics.anonymity;

import java.util.ArrayList;
import java.util.LinkedList;
import java.util.List;
import java.util.Queue;
import java.util.Random;
/**
 * 匿名内部类 内部类 就用于泛型
 *  generator 都生明成了static的，所以它们无法作为接口的一部分，
 *  因为无法用接口这种特定的惯用法来泛化这二者。
 *  尽管如此，它们fill()方法中都工作的很好
 *  
 * @author lenovo
 *
 */

class Customer
{
	private static long counter=1;
	private final long id=counter++;
	private Customer(){}
	public String toString(){return "Customer:"+id;}
	
	//每次会创建一个新的客户对象
	public static Generator
        
          generator(){
		return new Generator
         
          (){ public Customer next(){return new Customer();} }; } } //// 出纳员 class Teller { private static long counter=1; private final long id=counter++; private Teller(){} public String toString(){return "Teller"+id;} //Teller就只创建了一个public 的generator对象 public static Generator
          
            generator=new Generator
           
            () { public Teller next() { return new Teller(); } }; } ////////////// 出纳员 public class BankTeller { public static void serve(Teller t,Customer c) { System.out.println(t+" serves "+c); } public static void main(String[] args) { Random random=new Random(47); //生成客户对象15个 Queue
            
              line=new LinkedList
             
              (); Generators.fill(line, Customer.generator(), 15); //出纳员对象4个 List
              
                tellers=new ArrayList
               
                (); Generators.fill(tellers, Teller.generator, 4); for(Customer c:line) serve(tellers.get(random.nextInt(tellers.size())),c); } } /*output: Teller3 serves Customer1 Teller2 serves Customer2 Teller3 serves Customer3 Teller1 serves Customer4 Teller1 serves Customer5 Teller3 serves Customer6 Teller1 serves Customer7 Teller2 serves Customer8 Teller3 serves Customer9 Teller3 serves Customer10 Teller2 serves Customer11 Teller4 serves Customer12 Teller2 serves Customer13 Teller1 serves Customer14 Teller1 serves Customer15 * *///:~~~

java 泛型深入之Set实用工具 各种集合泛型深入使用示例，匿名内部类、内部类应用于泛型探讨(三)

java 泛型深入之Set实用工具各种集合泛型深入使用示例，匿名内部类、内部类应用于泛型探讨(三)