第六次作业(二)
测试类继承Thread,在控制台模拟了整个抽奖流程,包括抽奖的等待,等等...
Prize类和Person类设置人数和奖品数,并有相应的构造器。
防止溢出那里直接用List.size()方法就可以了。。。
代码如下,其余实现思想在代码中用备注指出:
package com.cumin; import java.util.ArrayList; import java.util.Collections; import java.util.Random; public class DrawPrize { private static ArrayList<Prize> prizes; private static ArrayList<Person> people; public ArrayList<Prize> dealPrize() { if (prizes == null) { prizes = new ArrayList<>(); for(int i=1;i<=Prize.numofprizes;i++){ prizes.add(new Prize("奖品", i)); } Collections.shuffle(prizes); } return prizes; } public ArrayList<Person> dealPerson() { if (people==null) { people = new ArrayList<>(); for(int i=1;i<=Person.numofpeople;i++){ people.add(new Person("人物", i)); } Collections.shuffle(people); } return people; } public static void drawPrize(){ Random rd = new Random(); int index1 =rd.nextInt(Prize.numofprizes--); //防止溢出 Prize prize =prizes.get(index1); int index2 =rd.nextInt(Person.numofpeople--); Person p =people.get(index2); System.out.println("获奖人为:"+p.getName()+" 奖品为:" +prize.getName()); //参与过后不可抽奖 prizes.remove(index1); people.remove(index2); } }
package com.cumin; public class Prize { //奖品总数 public static int numofprizes=100; private String name; public String getName() { return name; } public void setName(String name) { this.name = name; } //设置奖品编号 public Prize(String name, int i) { this.name = name + i + " "; } }
package com.cumin; public class Person { //抽奖人数 public static int numofpeople=100; private String name; public String getName() { return name; } public void setName(String name) { this.name = name; } public Person(String name, int i) { this.name = name + i + " "; } }
package com.cumin; public class Test extends Thread{ //抽奖流程 public void Draw() throws Exception{ System.out.println(".....抽奖即将开始,请耐心等待....."); try { sleep(3000); } catch (InterruptedException e) { e.printStackTrace(); } //创建人物和奖品 DrawPrize dp= new DrawPrize(); dp.dealPrize(); dp.dealPerson(); System.out.println(".....抽奖开始....."); System.out.println(".....正在紧张的抽奖中....."); try { sleep(3000); } catch (InterruptedException e) { e.printStackTrace(); } System.out.println(".....一等奖有一名....."); DrawPrize.drawPrize(); System.out.println(".....正在紧张的抽奖中....."); //抽奖中。。。 try { sleep(5000); } catch (InterruptedException e) { e.printStackTrace(); } System.out.println(".....二等奖有五名....."); for(int i=0;i<5;i++){ DrawPrize.drawPrize(); sleep(500); } System.out.println(".....正在紧张的抽奖中....."); try { sleep(4000); } catch (InterruptedException e) { e.printStackTrace(); } System.out.println(".....三等奖有十名....."); for(int i=0;i<10;i++){ DrawPrize.drawPrize(); sleep(500); } System.out.println(".....抽奖结束....."); } public static void main(String args[]) throws Exception{ new Test().Draw(); } }