How to understand how to obtain object attribute types, attribute names, and attribute values ​​in Java

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/** 
 * 根据属性名获取属性值 
 * */  
   private Object getFieldValueByName(String fieldName, Object o) {  
       try {    
           String firstLetter = fieldName.substring(0, 1).toUpperCase();    
           String getter = "get" + firstLetter + fieldName.substring(1);    
           Method method = o.getClass().getMethod(getter, new Class[] {});    
           Object value = method.invoke(o, new Object[] {});    
           return value;    
       } catch (Exception e) {    
           log.error(e.getMessage(),e);    
           return null;    
       }    
   }   
     
   /** 
    * 获取属性名数组 
    * */  
   private String[] getFiledName(Object o){  
    Field[] fields=o.getClass().getDeclaredFields();  
        String[] fieldNames=new String[fields.length];  
    for(int i=0;i<fields.length;i++){  
        System.out.println(fields[i].getType());  
        fieldNames[i]=fields[i].getName();  
    }  
    return fieldNames;  
   }  
     
   /** 
    * 获取属性类型(type)，属性名(name)，属性值(value)的map组成的list 
    * */  
   private List getFiledsInfo(Object o){  
    Field[] fields=o.getClass().getDeclaredFields();  
        String[] fieldNames=new String[fields.length];  
        List list = new ArrayList();  
        Map infoMap=null;  
    for(int i=0;i<fields.length;i++){  
        infoMap = new HashMap();  
        infoMap.put("type", fields[i].getType().toString());  
        infoMap.put("name", fields[i].getName());  
        infoMap.put("value", getFieldValueByName(fields[i].getName(), o));  
        list.add(infoMap);  
    }  
    return list;  
   }  
     
   /** 
    * 获取对象的所有属性值，返回一个对象数组 
    * */  
   public Object[] getFiledValues(Object o){  
    String[] fieldNames=this.getFiledName(o);  
    Object[] value=new Object[fieldNames.length];  
    for(int i=0;i<fieldNames.length;i++){  
        value[i]=this.getFieldValueByName(fieldNames[i], o);  
    }  
    return value;  
   }

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