System.out.println(1);
		int sum = 0;
		for(int a = 2; a < 101; a++) {
			
			int b = 2;
			while (b < a) {
				
				if (a % b == 0) {
					
					break;
					
				}
				b++;
			}
			
			if (a == b) {
				System.out.println(b);
				sum += 1;
			}
			
		}
		System.out.println("在[1,100]內，質數總數為：" + (sum+1));
 

	public static void main(String[] args) {
		
			int n =10;
			System.out.println(func(n));
		}
	private static int func(int n) {
		
		if (n == 1 || n== 2) {
			return 1;
		}
		else {
			return func(n-1) + func(n-2);
		}
			
		}

		for(int i = 100; i < 1001; i++) {
			int a = i / 100;
			int b = i / 10 % 10;
			int c = i % 10;
			if (i == a*a*a + b*b*b +c*c*c) {
				System.out.println(i);
			}
		}
 

	public static void main(String[] args) {
		String[] names = new String[8];
		getName(names);
		printNames(names);
		String name = rdnames(names);
		System.out.println("___________________");
		System.out.println(name);
	}
	
	public static void getName(String[] names) {
		names[0] = "A";
		names[1] = "B";
		names[2] = "C";
		names[3] = "D";
		names[4] = "E";
		names[5] = "F";
		names[6] = "G";
		names[7] = "H";						
	}
	public static void printNames(String[] names) {
		for(int i = 0; i < names.length; i++) {
			System.out.println(names[i]);
		}
	}
	public static String rdnames(String[] names) {
		int index = new Random().nextInt(names.length);
		return names[index];
	}
 

	public static void main(String[] args) {
		ArrayList<studentName> array = new ArrayList<studentName>();
		add(array);
		for( int i = 0; i < array.size(); i++) {
			studentName s = array.get(i);   //返回的是類！
			System.out.println(s.name + "  " + s.age);
		}
		Random rd = new Random();
		studentName m = array.get(rd.nextInt(array.size()));
		System.out.println(m.name + "  " + m.age);
	}
	public static void add(ArrayList<studentName> array) {
		studentName sn1 = new studentName();
		studentName sn2 = new studentName();
		studentName sn3 = new studentName();
		studentName sn4 = new studentName();
		studentName sn5 = new studentName();
		sn1.name = "yi";
		sn1.age = 1;
		sn2.name = "er";
		sn2.age = 2;
		sn3.name = "san";
		sn3.age = 3;
		sn4.name = "si";
		sn4.age = 4;
		sn5.name = "wu";
		sn5.age = 5;
		array.add(sn1);
		array.add(sn2);
		array.add(sn3);
		array.add(sn4);
		array.add(sn5);
	}

public class Doudizhu  {
 	public static void main(String[] args) {
 		//1. 組合牌
 		//建立Map集合,鍵是編號,值是牌
 		HashMap<Integer,String> pooker = new HashMap<Integer, String>();
 		//建立List集合,儲存編號
 		ArrayList<Integer> pookerNumber = new ArrayList<Integer>();
 		//定義出13個點數的陣列
 		String[] numbers = {"2","A","K","Q","J","10","9","8","7","6","5","4","3"};
 		//定義4個花色陣列
 		String[] colors = {"♠","♥","♣","♦"};
 		//定義整數變數,作為鍵出現
 		int index = 2;
 		//遍歷陣列,花色+點數的組合,儲存到Map集合
 		for(String number : numbers){
 			for(String color : colors){
 				pooker.put(index, color+number);
 				pookerNumber.add(index);
 				index++;
 			}
 		}
 		//儲存大王,和小王
 		pooker.put(0, "大王");
 		pookerNumber.add(0);
 		pooker.put(1, "小王");
 		pookerNumber.add(1);
 		
 		//洗牌,將牌的編號打亂
 		Collections.shuffle(pookerNumber);
 		
 		//發牌功能,將牌編號,發給玩家集合,底牌集合
 		ArrayList<Integer> player1 = new ArrayList<Integer>();
 		ArrayList<Integer> player2 = new ArrayList<Integer>();
 		ArrayList<Integer> player3 = new ArrayList<Integer>();
 		ArrayList<Integer> bottom = new ArrayList<Integer>();
 		
 		//發牌採用的是集合索引%3
 		for(int i = 0 ; i < pookerNumber.size() ; i++){
 			//先將底牌做好
 			if(i < 3){
 				//存到底牌去
 				bottom.add( pookerNumber.get(i));
 			   //對索引%3判斷
 			}else if(i % 3 == 0){
 				//索引上的編號,發給玩家1
 				player1.add( pookerNumber.get(i) );
 			}else if( i % 3 == 1){
 				//索引上的編號,發給玩家2
 				player2.add( pookerNumber.get(i) );
 			}else if( i % 3 == 2){
 				//索引上的編號,發給玩家3
 				player3.add( pookerNumber.get(i) );
 			}
 		}
 		//對玩家手中的編號排序
 		Collections.sort(player1);
 		Collections.sort(player2);
 		Collections.sort(player3);
 		//看牌,將玩家手中的編號,到Map集合中查詢,根據鍵找值
 		//定義方法實現
 		look("A",player1,pooker);
 		look("B",player2,pooker);
 		look("C",player3,pooker);
 		look("底牌",bottom,pooker);
 	}
 	public static void look(String name,ArrayList<Integer> player,HashMap<Integer,String> pooker){
 		//遍歷ArrayList集合,獲取元素,作為鍵,到集合Map中找值
 		System.out.print(name+" ");
 		for(Integer key : player){
 			String value = pooker.get(key);
 			System.out.print(value+" ");
 		}
 		System.out.println();
 	}
 }