从列表Android比较用户ID和日期后，删除旧对象？

如何解决从列表Android比较用户ID和日期后，删除旧对象？

我的数组列表中有类似这样的数据。

我已经尝试过此代码。

Collections.sort(streamList,new Comparator() {
            @Override
            public int compare(Object o1,Object o2) {
                Stream p1 = (Stream) o1;
                Stream p2 = (Stream) o2;
                return p1.getName().compareToIgnoreCase(p2.getName());
            }
        });

List<Stream> streamList = new ArrayList<>();

在删除具有相同userId的旧日期重复值之前：

[
  {
    "userName": "25","Date": "Thu Aug 20 18:38:54 GMT+05:30 2020"
  },{
    "userName": "26","Date": "Thu Aug 20 18:38:55 GMT+05:30 2020"
  },{
    "userName": "27","Date": "Thu Aug 20 18:38:56 GMT+05:30 2020"
  },{
    "userName": "28",{
    "userName": "29","Date": "Thu Aug 20 18:38:57 GMT+05:30 2020"
  },{
    "userName": "30","Date": "Thu Aug 20 18:38:58 GMT+05:30 2020"
  },"Date": "Thu Aug 20 18:39:50 GMT+05:30 2020"
  },"Date": "Thu Aug 20 18:39:56 GMT+05:30 2020"
  }
]

在删除具有相同userId的旧日期重复值之后的预期输出：

[
  {
    "userName": "25","Date": "Thu Aug 20 18:39:56 GMT+05:30 2020"
  }
]

Stream.java

 public class Stream {
 
   /** Property userName */
   String userName;
 
   /** Property date */
   Date date;
 
   /**
    * Constructor
    */
   public Stream() {
   }
 
   /**
    * Gets the userName
    */
   public String getUserName() {
      return this.userName;
   }
 
   /**
    * Sets the userName
    */
   public void setUserName(String value) {
      this.userName = value;
   }
 
   /**
    * Gets the Date
    */
   public Date getDate() {
      return this.date;
   }
 
   /**
    * Sets the Date
    */
   public void setDate(Date value) {
      this.date = value;
   }
}