java 枚举类使用反射

前言

跟普通类使用反射基本一样。

一、枚举类

public enum OperateType {
    add("添加", 0),
    delete("删除", 1),
    select("查询", 2),
    update("修改", 3),
    stop("停止", 4),
    restart("重启", 5),
    check("检查", 6),
    download("下载", 7),
    upload("上传", 8),
    login("登录", 9),
    logout("退出", 10),
    other("其他", 11);
    private final String value;
    private final int intVal;

    OperateType(String value, int intVal) {
        this.value = value;
        this.intVal = intVal;
    }

    public static String getNameByIntVal(int intVal) {
        for (OperateType operateType : values()) {
            if (operateType.intVal == intVal)
                return operateType.name();
        }
        return other.name();
    }

    public String getValue() {
        return value;
    }

    public int getIntVal() {
        return intVal;
    }
}

二、反射获取枚举

 	@Test
 	public void invokeEnum() throws ClassNotFoundException {

        String name = "select";
        Class<?> clazz = Class.forName("com.iscas.biz.config.log.OperateType");
        Object[] enumConstants = clazz.getEnumConstants();

        Optional<Object> select = Arrays.stream(enumConstants)
                .filter(item -> item.toString().equalsIgnoreCase(name))
                .findFirst();
                
        if (select.isPresent()){
            OperateType enumValue = (OperateType)select.get();
            System.out.println(enumValue.name());
        }
    }

三、反射调用枚举方法

 		@Test
        public void invokeEnumMethod() throws ClassNotFoundException, NoSuchMethodException, InvocationTargetException, IllegalAccessException {

            String name = "select";
            String methodName = "getValue";

            Class<?> clazz = Class.forName("com.iscas.biz.config.log.OperateType");
            Object[] enumConstants = clazz.getEnumConstants();

            Optional<Object> select = Arrays.stream(enumConstants)
                    .filter(item -> item.toString().equalsIgnoreCase(name))
                    .findFirst();
            if (select.isPresent()) {
                Object obj =select.get();
                
                Method method = clazz.getDeclaredMethod(methodName);
                Object value = method.invoke(obj);

                System.out.println(value);
            }
        }