Java实现抽奖功能的抽奖模板盲盒抽奖都可以套用上

entity

1.  
   public class Goods {
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   public Goods(String name, int wight) {
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   this.name = name;
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   this.wight = wight;
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   }
6.  
    
7.  
   public String getName() {
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   return name;
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   }
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    public void setName(String name) {
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    this.name = name;
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    }
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    public int getWight() {
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    return wight;
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    }
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    public void setWight(int wight) {
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    this.wight = wight;
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    }
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    private String name; //商品名
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    private int wight ; //权重
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    }

VO

1.  
   public class Container {
2.  
   public Container(String name, int num) {
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   this.name = name;
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   this.num = num;
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   }
6.  
    
7.  
   public String getName() {
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   return name;
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   }
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    public void setName(String name) {
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    this.name = name;
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    }
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    public int getNum() {
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    return num;
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    }
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    public void setNum(int num) {
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    this.num = num;
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    }
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    // 容器
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    private String name;
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    private int num;//抽奖会用上
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    }

实现类

1.  
   import java.util.ArrayList;
2.  
   import java.util.HashMap;
3.  
   import java.util.List;
4.  
    
5.  
   public class Lottery {
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   public static String draw(){
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   // 列出商品
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   Goods goods1 =new Goods("洗洁精",20);
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   Goods goods2 =new Goods("大米",10);
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    Goods goods3 =new Goods("火彩盒",5);
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    Goods goods4 =new Goods("lv包包",15);
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    Goods goods5 =new Goods("macbook",22);
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    Goods goods6 =new Goods("ipadpro2020",24);
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    Goods goods7 =new Goods("火影忍者全套漫画集",4);
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    // 开始抽奖
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17.  
    int sum=0;//总数
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    int n=0 ;//用于抽奖
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    int a1=0;
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    int a2=0;
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    List<Container> containers =new ArrayList<>();
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    containers.add(new Container(goods1.getName(),sum =goods1.getWight()));
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    containers.add(new Container(goods2.getName(),sum =goods2.getWight()));
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    containers.add(new Container(goods3.getName(),sum =goods3.getWight()));
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    containers.add(new Container(goods4.getName(),sum =goods4.getWight()));
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    containers.add(new Container(goods5.getName(),sum =goods5.getWight()));
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    containers.add(new Container(goods6.getName(),sum =goods6.getWight()));
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    containers.add(new Container(goods7.getName(),sum =goods7.getWight()));
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31.  
    int num =(int)(Math.random()*sum 1); //1到权重总和的一个随机数字
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33.  
    for(int i=0;i<containers.size();i ){
34.  
    a2=containers.get(i).getNum();
35.  
    if(num>=a1&&num<a2){
36.  
    return containers.get(i).getName();
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    }
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    a1=a2;
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    }
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    return containers.get(containers.size()-1).getName();
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42.  
     
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44.  
    }
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46.  
    public static void main(String[] args) {
47.  
    String draw = draw();
48.  
    System.out.println(draw);
49.  
    }
50.  
    }

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