JAVA 通过string值和int值获取枚举对象说明

梦里梦外; 2022-12-20 08:56 174阅读 0赞

JAVA 通过string值和int值 获取枚举对象  
调用方法：

int dType=Integer.parseInt(Long.toString(fdList.get(j).getDatatype()));
    //调用方法一
    dbfieldtype dbfdType=this.intToEnum(dbfieldtype.class,dType);
    //调用方法二
    dbfdType=dbfieldtype.codeOf(dType);
    //Enum.valueOf(dbfieldtype.class,Long.toString(dType));
    tableObj.fields.get(i).type=dbfdType;

//定义的枚举类型

import java.io.Serializable;
    
    public enum dbfieldtype implements Serializable {
        
        Int(1),
        decimal(3),
        string(4),
        datetime(5),
        date(6),
        time(7),
        binary(8),
        bool(13),
        geometry(14),
        undefine(-1);
        //
        private int code=4;
        dbfieldtype(int code){
        
            this.code=code;
        }
        public int getCode()
        {
        
            return code;
        }
        public int getValue()
        {
           //此方法必须定义，转换时需要调用此方法
            return code;
        }
        public static dbfieldtype codeOf(int code) {
        
            for (dbfieldtype fdType : values()) {
        
                if (fdType.getValue() == code) {
        
                    return fdType;
                }            
            }
            throw new RuntimeException("没有找到对应的枚举");
        }
    }

定义转换函数：  
转换函数参考地址：[https://blog.csdn.net/yuanwenyan/article/details/83824308][https_blog.csdn.net_yuanwenyan_article_details_83824308]

//
        public <T extends Enum<T>> T stringToEnum(Class<T> enumType,
                                                  String value) {
        
            T t = null;
            try {
        
                for (T ele:enumType.getEnumConstants()) {
        
                    if (enumType.getMethod("getValue").invoke(ele).equals(value)){
        
                        t = ele;
                        break;
                    }
                }
    
            } catch (Exception e) {
        
                //e.printStackTrace();
                this.printMsg(e.getMessage());
            }
            return t;
        }
        public  <T extends Enum<T>> T intToEnum(Class<T> enumType,
                                                int value) {
        
            T t = null;
            try {
        
                for (T ele:enumType.getEnumConstants()) {
        
                    if (enumType.getMethod("getValue").invoke(ele).equals(value)){
        
                        t = ele;
                        break;
                    }
    
                }
            } catch (Exception e) {
        
                //e.printStackTrace();
                this.printMsg(e.getMessage());
            }
            return t;
        }
        //

[https_blog.csdn.net_yuanwenyan_article_details_83824308]: https://blog.csdn.net/yuanwenyan/article/details/83824308