17-5:LinkedHashSet有序且为链表，HashSet无序

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package cn.itcast.p4.hashset.demo;import java.util.HashSet;import java.util.Iterator;import java.util.LinkedHashSet;public class LinkedHashSetDemo {/** * @param args */public static void main(String[] args) {HashSet hs = new LinkedHashSet();hs.add("hahah");hs.add("hehe");hs.add("heihei");hs.add("xixii");//hs.add("hehe");Iterator it = hs.iterator();while(it.hasNext()){System.out.println(it.next());}}}

package cn.itcast.p4.hashset.demo;import java.util.HashSet;import java.util.Iterator;public class HashSetDemo {/** * @param args */public static void main(String[] args) {HashSet hs = new HashSet();hs.add("hehe");//hs.add("heihei");hs.add("hahah");hs.add("xixii");hs.add("hehe");Iterator it = hs.iterator();while(it.hasNext()){System.out.println(it.next());}}}

package cn.itcast.p4.hashset.test;import java.util.HashSet;import java.util.Iterator;import cn.itcast.p.bean.Person;public class HashSetTest {/** * @param args */public static void main(String[] args) {HashSet hs = new HashSet();hs.add(new Person("lisi4",24));hs.add(new Person("lisi7",27));hs.add(new Person("lisi1",21));hs.add(new Person("lisi9",29));hs.add(new Person("lisi7",27));Iterator it = hs.iterator();while(it.hasNext()){Person p = (Person)it.next();System.out.println(p);//System.out.println(p.getName()+"...."+p.getAge());}}}