找到最大的arraylist

Question

我在我的ArrayList中使用以下数据：

我想知道如何在下面的对中得到marketName的最大百分比

感谢您的帮助。

Answer 1

以下是逻辑：

1. 创建一个TreeMap，它将根据对保持密钥。
2. 使用pair和marcketName的组合作为键和
   1. 如果该密钥不存在则将其放入Map
   2. 如果当前值更大，则检查存储值 用更大的。

3. 循环遍历TreeMap并打印所需的结果。

   public class FindMaxArrayList {
   
    public static void main(String[] args) {
   
       List<Marcket> marcketList=new ArrayList<>();
       Map<String,Double> maxofArrayList=new TreeMap<>();
   
       // Create Sample Data
       Marcket m1=new Marcket("BitTrex", "ETH/BTC",0.518);marcketList.add(m1);
       Marcket m2=new Marcket("Liqui", "ETH/BTC",0.658);marcketList.add(m2);
       Marcket m3=new Marcket("Yobit", "ETH/BTC",0.658);marcketList.add(m3);
       Marcket m4=new Marcket("BitTrex", "ETH/BTC",0.618);marcketList.add(m4);
       Marcket m5=new Marcket("Liqui", "ETH/BTC",0.458);marcketList.add(m5);
       Marcket m6=new Marcket("Yobit", "ETH/BTC",0.758);marcketList.add(m6);
   
   
       Marcket m11=new Marcket("BitTrex", "LTC/BTC",0.818);marcketList.add(m11);
       Marcket m12=new Marcket("Liqui", "LTC/BTC",0.458);marcketList.add(m12);
       Marcket m13=new Marcket("Yobit", "LTC/BTC",0.758);marcketList.add(m13);
       Marcket m14=new Marcket("BitTrex", "LTC/BTC",0.518);marcketList.add(m14);
       Marcket m15=new Marcket("Liqui", "LTC/BTC",0.858);marcketList.add(m15);
       Marcket m16=new Marcket("Yobit", "LTC/BTC",0.958);marcketList.add(m16);
   
   
       //Processing List 
       for(Marcket m:marcketList) {
           if(maxofArrayList.containsKey(m.getPair()+":"+m.getMarcketName())) {
               if(maxofArrayList.get(m.getPair()+":"+m.getMarcketName())<m.getPercentage()){
                   maxofArrayList.put(m.getPair()+":"+m.getMarcketName(), m.getPercentage());
               }
           }else {
               maxofArrayList.put(m.getPair()+":"+m.getMarcketName(), m.getPercentage());
           }
       }
   
       //Printing List
       for(String key:maxofArrayList.keySet()) {
           String[] content=key.split(":");
           System.out.println(content[1]+"\t"+content[0]+"\t"+maxofArrayList.get(key));
       }
   }
   }
   
   class Marcket{
   
   private String marcketName;
   private String pair;
   private double percentage;
   
   public Marcket(String marcketName, String pair, double percentage) {
       this.marcketName = marcketName;
       this.pair = pair;
       this.percentage = percentage;
   }
   public String getMarcketName() {
       return marcketName;
   }
   public void setMarcketName(String marcketName) {
       this.marcketName = marcketName;
   }
   public String getPair() {
       return pair;
   }
   public void setPair(String pair) {
       this.pair = pair;
   }
   public double getPercentage() {
       return percentage;
   }
   public void setPercentage(float percentage) {
       this.percentage = percentage;
   }
   }