小编Gan*_*der的帖子

我是 Java 新手，正在解决一个问题，我需要根据下面的匹配键对集合进行分组和聚合，这个键是来自下面提到的类的属性的组合。

class MyKey {    
      String planYearMonth;
      String carSeries;
      String weekNo;
      String factoryCode;
      String lineClass;
      String frameSortCode;
      String ocfClassificationCode;
      String locationIdentificationCode;
      String carGroup;
      //setters & getters
      //equals & hashcode
    }

public class OCFIdentificationInfo {    
    private String frameSortCode;   
    private String ocfClassificationCode;   
    private String locationIdentificationCode;  
    private String carGroup;    
    private String frameCode;   
    //getters 
    //setters
    //hashCode
    //equals
    //toString
}

public class DailyOCF { 
    private String planYearMonth;   
    private String carSeries;   
    private String weekNo;  
    private String day; 
    private String factoryCode; 
    private String lineClass;   
    private OCFIdentificationInfo …