比如String类,当JVM加载String类时,它首先读取String.class文件到内存,然后,为String类创建一个Class实例并关联起来: Class cls = new Class(String); 1. JVM持有的每个Class实例都指向一个数据类型(class或interface)。一个Class实例包含了该class的所有完整信息,包括类名、包名、父类、实现的接口、所有方法、字段...
C++规定枚举的大小只要能够容纳下3bits或者4bits(上面的例子)就行,至于分配1byte还是4bytes,是编译器决定的,但是C++标准有个限制:1<=sizeof(enum)<=sizeof(int)。 实例代码: #include<iostream> usingnamespacestd; classA{ public: //enum类型本身不占内存 enumEnumTest{ a=1,b=5}; }; enumEnumTest{ ...
C++规定枚举的大小只要能够容纳下3bits或者4bits(上面的例子)就行,至于分配1byte还是4bytes,是编译器决定的,但是C++标准有个限制:1<=sizeof(enum)<=sizeof(int)。 实例代码: #include <iostream> using namespace std; class A{ public: //enum类型本身不占内存 enum EnumTest{ a =1,b = 5}; }; enu...
当然可以加点其它,比起C要好一丢丢,然而也仅限于此。以至于当这种简单类型无法满足我们需要要扩展的时候就会使用class/struct来取代写出类似这种代码 1 2 3 4 5 6 7 8 9 10 11 12 13 14 publicsealedclassError { publicstaticreadonlySignError=newError(110,"sign error."); publicstaticreadonlyNetworkError...
This will declare a 1 byte enumeration. Saturday, September 2, 2006 1:58 PM ✅Answered To be portable, you could always wrap the enum in a way such as this 複製 #include <iostream> using namespace std; enum MyEnum { zero, one, two, three }; class MyTinyEnum { unsigned char va...
EquivalenceClass = 5, Meta = 6, // unused Accept2 = 7, Next = 8, }; enum TableItemSize: u16 { Data8 = 0x01, Data16 = 0x02, Data32 = 0x04, Data64 = 0x08, }; struct TableHeader { be TableID ID; be TableItemSize itemSize; ...
enumclassendian{little =0, big =1, native = little }; Members ElementDescription littleIndicates that scalar types are little-endian. That is, the least significant byte is stored in the smallest address. For example,0x1234is stored0x340x12. ...
但是,在这里,我告诉你,enum和struct、class一样,都是用户自定义类型。 对呀!enum是用户自定义类型,他有数据成员,还有成员函数! For example: enum e{a=1 , b=2 , c=4}; 那么: 001: enum e e1; //enum e不是对象,它是类型,e1才是类型enum的对象! 002: e e1; //e是类型enum e的简写哦! 003...
In a similar way, numerical values are obtained from a string using static methods 'Parse' and 'TryParse' of class 'Enum'. Another advantage of the [Flags] attribute is that it makes the debugging process easier, too. The value of the 'en2' variable will be displayed as a set of named...
C++规定枚举的大小只要能够容纳下3bits或者4bits(上面的例子)就行,至于分配1byte还是4bytes,是编译器决定的,但是C++标准有个限制:1<=sizeof(enum)<=sizeof(int)。 实例代码: #include <iostream> using namespace std; class A{ public: //enum类型本身不占内存 ...