集合的一些应用 扑克牌 年龄排序

版权声明：本文为博主原创文章，未经博主允许不得转载。 https://blog.csdn.net/qwer1203355251/article/details/52939153

1. 

import java.util.*;


import javax.print.attribute.standard.SheetCollate;


class Person
{
	int age;
	String name;
	public Person(int age, String name) {
		super();
		this.age = age;
		this.name = name;
	}
	public String toString()
	{
		return "{"+name+" "+age+"}";
	}
}


class Poker
{
	String color;
	String num;
	public Poker(String color, String num) {
		super();
		this.num = num;
		this.color = color;
	}
	public String toString()
	{
		return "{"+color+" "+num+"}";
	}
}


public class Poker1 
{
	public static void main(String[] args) 
	{
		LinkedList pokers = creatPoker();
		//System.out.println(pokers);
		//System.out.println(pokers.size());
		//showPoker(pokers);
		shufflePoker(pokers);
		showPoker(pokers);
	}	
	public static LinkedList creatPoker()//生成一副扑克牌
	{
		LinkedList list = new LinkedList();
		String[] colors = {"黑桃","红桃","梅花","方块"};
		String[] nums = {"A","2","3","4","5","6","7","8","9","10","J","Q","K"};
		for(int i=0;i<nums.length;i++)
		{
			for(int j=0;j<colors.length;j++)
			{
				list.add(new Poker(colors[j], nums[i]));
			}
		}
		return list;
	}
	public static void showPoker(LinkedList pokers)//展示扑克牌
	{
		for(int i=0;i<pokers.size();i++)
		{
			System.out.print(pokers.get(i));
			if(i%4==3)
				System.out.println();
		}
	}
	public static void shufflePoker(LinkedList pokers)
	{
		Random random = new Random();
		for(int i=0;i<50;i++)
		{
			int index1 = random.nextInt(pokers.size());
			int index2 = random.nextInt(pokers.size());
			Poker poker1 = (Poker)pokers.get(index1);
			Poker poker2 = (Poker)pokers.get(index2);
			pokers.set(index1, poker2);
			pokers.set(index2, poker1);
		}
	}
}

{方块 5}{梅花 6}{红桃 3}{黑桃 3}
{梅花 Q}{黑桃 K}{方块 8}{方块 Q}
{梅花 7}{方块 4}{梅花 10}{红桃 K}
{方块 J}{梅花 4}{红桃 4}{方块 K}
{梅花 5}{黑桃 7}{方块 9}{黑桃 5}
{红桃 5}{梅花 J}{黑桃 A}{黑桃 8}
{红桃 10}{红桃 7}{黑桃 4}{红桃 A}
{黑桃 9}{方块 6}{梅花 8}{方块 A}
{红桃 6}{红桃 9}{方块 10}{梅花 3}
{黑桃 2}{黑桃 J}{梅花 A}{红桃 8}
{红桃 2}{红桃 J}{梅花 9}{梅花 2}
{黑桃 10}{红桃 Q}{方块 2}{黑桃 6}
{方块 3}{方块 7}{梅花 K}{黑桃 Q}
2.

import java.util.*;




class Person
{
	int age;
	String name;
	public Person(int age, String name) {
		this.age = age;
		this.name = name;
	}
	public String toString()
	{
		return "{"+name+" "+age+"}";
	}
}


public class Paixu {
	public static void main(String[] args) {
		LinkedList list = new LinkedList();
		list.add(new Person(17,"狗娃"));
		list.add(new Person(22,"狗剩"));
		list.add(new Person(50,"美美"));
		for(int i=0;i<list.size();i++)
			for(int j=i+1;j<list.size();j++)
			{
				Person p1 = (Person)list.get(i);
				Person p2 = (Person)list.get(j);
				if(p1.age>p2.age)
				{
					list.set(i, p2);
					list.set(j, p1);
				}
			}
		System.out.println(list);
	}
}

运行结果：


[{狗娃 17}, {狗剩 22}, {美美 50}]