LinkedHashSet 类

package com.oracle.demo01;

import java.util.Iterator;
import java.util.LinkedHashSet;

public class Demo04 {
    public static void main(String[] args) {
        //LinkedHashSet<String>():怎么存，怎么取，有序
        
        LinkedHashSet<String> set =new LinkedHashSet<String>();
        set.add("ppp");
        set.add("aaa");
        set.add("ppp");//重复的不会再次添加
        
        //遍历
        //1.while循环
        //获取迭代器对象
        Iterator<String> arr=set.iterator();
        while (arr.hasNext()) {
            String string = (String) arr.next();
            System.out.println(string);
        }
        //2.增强for循环
        for (String string : set) {
            System.out.println(string);
        }
    }
}

package com.oracle.demo01;

import java.util.Iterator;
import java.util.LinkedHashSet;

public class Demo05 {
    public static void main(String[] args) {
        LinkedHashSet<Person> set=new LinkedHashSet<Person>();
        set.add(new Person("小花",18));
        set.add(new Person("小明",19));
        set.add(new Person("小李",18));
        
        Iterator<Person> arr=set.iterator();
        while (arr.hasNext()) {
            Person person = (Person) arr.next();
            System.out.println(person);
        }
        
        for (Person person : set) {
            System.out.println(person);
        }
        
        
        
        
    }
}