How to convert enum value to int? 我有一个返回int类型的函数。但是,我只有一个税收枚举的值。 如何将纳税枚举值强制转换为int? 1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 16 publicenumTAX{ NOTAX(0),SALESTAX(10),IMPORTEDTAX(5); privateintvalue; privateTAX(intvalue){ this.value=value; ...
java.lang.Integer cannot be cast to java.lang.Double是类型转换出现的错误,当是这个数据在前端明明处理过,使用parseFloat转为了浮点数 后端使用List<List>进行接收,此时也没有报错 于是打开debug进行调试检查问题,发现传过来的数值如果是整数则为Integer类型,有小数的才是double类型 但是在接收后转为List<List< doub...
publicclassDayDemo {publicstaticfinalintMONDAY =1;publicstaticfinalintTUESDAY=2;publicstaticfinalintWEDNESDAY=3;publicstaticfinalintTHURSDAY=4;publicstaticfinalintFRIDAY=5;publicstaticfinalintSATURDAY=6;publicstaticfinalintSUNDAY=7; } 上述的常量定义常量的方式称为int枚举模式,这样的定义方式并没有什么错,但...
publicfinal intcompareTo(Eo){Enum<?>other=(Enum<?>)o;Enum<E>self=this;if(self.getClass()!=other.getClass()&&// optimizationself.getDeclaringClass()!=other.getDeclaringClass())thrownewClassCastException();returnself.ordinal-other.ordinal;} ordinal:表示枚举的顺序,从Color类中可以看出,它是从0开...
*/ public final int compareTo(E o) { Enum<?> other = (Enum<?>)o; Enum<E> self = this; if (self.getClass() != other.getClass() && // 优化 self.getDeclaringClass() != other.getDeclaringClass()) throw new ClassCastException(); return self.ordinal - other.ordinal; } /** * 返...
(2) compareTo()方法: Enum实现了java.lang.Comparable接口,因此可以比较象与指定对象的顺序。Enum中的compareTo返回的是两个枚举值的顺序之差。当然,前提是两个枚举值必须属于同一个枚举类,否则会抛出ClassCastException()异常。(具体可见源代码) Color.RED.compareTo(Color.BLUE); //返回结果 -1 ...
public final int compareTo(E o) { Enum other = (Enum)o; Enum self = this; if (self.getClass() != other.getClass() && // optimization self.getDeclaringClass() != other.getDeclaringClass()) throw new ClassCastException(); return self.ordinal - other.ordinal; ...
public final int compareTo(E o) { Enum<?> other = (Enum<?>)o; Enum<E> self = this; if (self.getClass() != other.getClass() && // optimization self.getDeclaringClass() != other.getDeclaringClass()) throw new ClassCastException(); ...
Just a comment, I needed to cast the returned object of map.get() to my enum type, in your code it should be: public static PageType valueOf(int pageType) { return (PageType)map.get(pageType); //CAST HERE } That’s how I make it working, thanks again! Regards, Juan Reply Bo...
{returnthis==other;}//比较的是ordinal值publicfinalintcompareTo(Eo){Enum<?>other=(Enum<?>)o;Enum<E>self=this;if(self.getClass()!=other.getClass()&&// optimizationself.getDeclaringClass()!=other.getDeclaringClass())thrownewClassCastException();returnself.ordinal-other.ordinal;//根据ordinal值...