2017-9-6 stack栈 队列 字典

stack 栈
int [] numbers={1,2,3,4,5};
string[] strs = { "li", "liu", "zhang", "wang" };
Stack stack=new Stack(strs);
//入栈 Push
stack.Push(1);
//出栈 Pop
int number = (int)stack.Pop(); // 此时移除 wang
object obj = stack.Pop ();
Console.WriteLine (obj);
//获取栈顶元素 Peek
object obj_1=stack.Pop(); //此时移除 zhang
Console.WriteLine (obj_1);

        object obj_2=stack.Peek();   // 输出为liu
        Console.WriteLine (obj_2);
        //是否包含某个元素
        stack.Contains("2");
        //转为数组
        object[] objs=stack.ToArray();
        //获取栈的长度
        int count=stack.Count;
        //输出栈中的每个元素
        for(int i=0;i<count;++i){
            Console.WriteLine( stack.Pop ());
        }

队列
Queue queue=new Queue(stack); //可以把栈转成队列
Queue <int>queue_2=new Queue<int>(numbers);
//入队列 从后面入
queue.Enqueue("li");
queue_2.Enqueue (1);
//出队列
object obj= queue.Dequeue();
int number = queue_2.Dequeue ();
//获取队列的头部元素
object obj_1=queue.Peek();
int number_1 = queue_2.Peek ();
Console.WriteLine (obj_1);
//队列元素个数
queue_2.Count;
queue.Count;
Console.WriteLine (queue.Count);
字典
Dictionary<string,int>dic=new Dictionary<string, int>();

        dic.Add ("One", 1);
        dic.Add ("Two", 2);

        int number = dic ["One"];
        //修改
        dic ["One"]=3;
        int number1 = dic ["One"];
        Console.WriteLine (number1);

        Dictionary<string,string>strDic=new Dictionary<string, string>();
        //若是没有 会自动加   键是独一无二的  值是可以重复的.
        strDic ["Li"] = "an";
        strDic ["Li"] = null;
        //值就变为Null了
        Console.WriteLine (strDic["Li"]);

        strDic.Remove ("Li");
        //打印字典长度 (键和值 一起)单位是 对；
        Console.WriteLine (strDic.Count);
        //是否包含指定的键
        if (dic.ContainsKey ("Three")) {
            Console.WriteLine ("XXXXX");
        }
        //是否包含指定的值
        if (dic.ContainsValue (2)) {
            Console.WriteLine ("Value is 2");
        }
                            //keys 表示字典里对应的键
        foreach (string key in dic.Keys) {
            Console.WriteLine (key+" : "+dic[key]);
        }
        foreach (int value in dic.Values) {
            Console.WriteLine (value);
        }