Guava ---- FluentIterable迭代器

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Guava提供了可以在Iterator中进行处理的功能更丰富的迭代器，其实就像是加了一个代理，增加一些功能。

package com.wenniuwuren.collections;import java.util.ArrayList;import java.util.Iterator;import java.util.List;import com.google.common.base.Function;import com.google.common.base.Joiner;import com.google.common.base.Predicate;import com.google.common.collect.FluentIterable;import com.google.common.collect.Lists;/** *  * @author wenniuwuren * */public class FluentIterableTest {@SuppressWarnings("unchecked")public static void main(String[] args) {Person person1 = new Person("lilei", 50);Person person2 = new Person("hanmeimei", 40);@SuppressWarnings("rawtypes")ArrayList personList = Lists.newArrayList(person1, person2);//返回一个按条件过滤后的结果集Iterable<Person> personFilterByAge = FluentIterable.from(personList)  .filter(new Predicate<Person>() {@Overridepublic boolean apply(Person input) {return input.getAge() > 40;}    });Iterator<Person> i = personFilterByAge.iterator();while(i.hasNext()) {System.out.println("年龄大于40的是：" + i.next().getName());}System.out.println("-------------我是邪恶的分割线-------------");// 返回处理过的结果集List<String> transformedPersonList = FluentIterable.from(personList).transform(new Function<Person, String>() {@Overridepublic String apply(Person input) {return Joiner.on(':').join(input.getName(), input.getAge());}}).toList();   Iterator transformedPersonListIterator = transformedPersonList.iterator();   while(transformedPersonListIterator.hasNext()) {   System.out.println("拼接起来的结果是：" + transformedPersonListIterator.next());   }    }    }class Person {private String name;private int age;public Person(String name, int age) {this.name = name;this.age = age;}public String getName() {return name;}public void setName(String name) {this.name = name;}public int getAge() {return age;}public void setAge(int age) {this.age = age;}}

参考资料：

《Getting Started with Google Guava》

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