import java.util.*;

public class CollectionTest {
    public static void main(String[] args){

/*
        Collection; //接口定義集合
        Set;        //Set無(wú)序不可重復(fù)集合 接口
        List;        //  有序可重復(fù)列表 接口
        HashSet;
        LinkedList;
        ArrayList;
        Map;        // 鍵值對(duì)數(shù)據(jù)表 hashcode等同于key value等同于equals對(duì)比的值
        HashMap;
        Hashtable;
*/



        Collection c = new HashSet();



        c.add("集合");
        c.add(true);
        c.add("Collection");
        c.add(new Human(456));
        c.add(new Float(888.666f));

        //容器獲取iterator迭代器位置始終從0號(hào)元素的下標(biāo)開(kāi)始
        Iterator _iter =  c.iterator();
        while(_iter.hasNext()){
           System.out.println(_iter.next());
        }

        /*System.out.println(c.add(new Human(456)));


        System.out.println(c);

        System.out.println("Hello".hashCode());
        System.out.println(new String("Hello").hashCode());
*/


    }
}

class Human{
    private int gine;
    Human(int gine){
        this.gine = gine;
    }
    @Override
    public boolean equals(Object obj) {
        if(obj instanceof Human){
            return this.gine == ((Human)obj).gine ? true : false;
        }
        return false;
    }

    @Override
    public int hashCode() { //重寫(xiě)hashcode hashcode用于對(duì)比兩個(gè)對(duì)象的引用的值 所以在set容器數(shù)組中必須重寫(xiě)
        return Integer.hashCode(this.gine);
    }

    @Override
    public String toString() {
        return String.valueOf(this.gine);
    }

}