java自定义异常配合枚举

自定义异常：

public class SimpleException extends RuntimeException {    private String msg ;    private StatusCode statusCode ;    public SimpleException(StatusCode statusCode, String msg) {        super(msg) ;        this.msg = msg ;        this.statusCode = statusCode ;    }    public SimpleException(StatusCode statusCode, String msg, Throwable e) {        super(msg, e) ;        this.msg = msg ;        this.statusCode = statusCode ;    }    public StatusCode getStatusCode() {        return statusCode;    }    public void setStatusCode(StatusCode statusCode) {        this.statusCode = statusCode;    }    @Override    public String toString() {        return "登陆异常："+this.statusCode+" "+this.msg ;    }}

枚举：

public enum  StatusCode {    UNKNOWN_ERR("未知错误",0),    USERNAME_OR_PASSWORD_ERR("用户名密码错误", 1),    REANLNAME_OR_IDNUMBER_ERR("姓名身份证号错误", 2),    SMS_CODE_ERR("验证码错误", 3),    REDIS_ERR("Redis操作异常",4),    GENERAL_ERR("一般异常",5),    HTTP_POST_ERR("http post 请求异常",6),    HTTP_GET_ERR("http get 请求异常",7);    // 成员变量    private String name;    private Integer index;    // 构造方法    private StatusCode(String name, Integer index) {        this.name = name;        this.index = index;    }    // 普通方法    public static String getName(Integer index) {        for (StatusCode c : StatusCode.values()) {            if (c.getIndex() == index) {                return c.name;            }        }        return null;    }    // get set 方法    public String getName() {        return name;    }    public void setName(String name) {        this.name = name;    }    public Integer getIndex() {        return index;    }    public void setIndex(Integer index) {        this.index = index;    }    @Override    public String toString() {        return this.index+":"+this.name;    }}