咱们学习了类和对象的基础知识过后,就能够来理解一些对象背地的常识了。

Student wx = new Student();

这行代码,实际上做了三件事:

  1. 生成一个对象(new Student()),取得该对象的存储地址
  2. 申明一个Student的变量wx
  3. 将在1中生成的对象存储地址赋值给2中的变量wx,从而把变量wx和对象关联起来

如图所示:

了解这三步十分重要。其关键点就在于:wx中存储的不是对象自身,而是对象的地址。在C#中,对象的地址又被称之为“援用”,所以但凡以这种模式寄存的类型,都被称之为

援用类型

但凡由class申明的类型,都是援用类型;“指向”援用类型(寄存援用类型对象的地址)的变量,就被称之为援用类型变量。因为援用类型变量并不寄存实质性数据,所以当咱们运行这一行代码的时候:

wx.age = 18;

18并没有寄存在wx中,而是寄存在wx(通过内存地址)所指向的对象中,如图所示:

同时留神,如果wx变量没有指向任何对象的话,咱们能够说它的值为null 。null值上不能进行任何运算,因为对象为null值而报的谬误NullReferenceException是程序中最常见的谬误。

Student wx = null; //运行就会报错:NullReferenceException Console.WriteLine(wx.Name);

和援用类型对应的,就是

值类型

目前咱们曾经学习过的int,float,bool等都是值类型(string是一种十分非凡的援用类型,数组是援用类型)。值类型的特点就是:

变量寄存的不是地址,而是间接寄存“值”。比方:

int i = 18;

变量i中间接寄存着18这个数值。如图所示:

值类型变量的值不能为null,如果没有为其赋值,它会有一个默认值(参考:默认值表)。

了解值类型和援用类型的区别有什么作用呢?咱们来看一下这两段代码:

int i = 18; int j = i; -- 留神这一行代码 j = 20; Console.WriteLine(i); -- i的值是18还是20?

咱们留神赋值运算符(=),它意味着将=右侧的值赋值给左侧。那么 j=i ,就是把变量i的值赋值给变量j。而变量i的值是多少? 是整数18。这里的赋值,不是“挪动”(挪动的话i就没值了,^_^),而是“复制”,就是把i中的值18复制一份给j,让j里也寄存着18。

所以,再下一句,j=20,就又把20赋值给了j,但也仅仅是把20赋值给了j,不能影响i的值。

那么,再看看这个代码:

Student wx = new Student(); wx.age = 18; Student clone = wx; -- 这里是把wx的什么赋值给了clone? clone.age = 20; Console.WriteLine(wx.age);

大体上和下面的i/j赋值相似,然而运行之后咱们发现wx.age变成了20,为什么呢?

因为 Student clone = wx; 这一行代码,实际上是把变量wx中寄存的Student对象地址赋值给了clone,从而让clone变量中也寄存了wx的对象地址。通过&运算能够分明的看到这一点:

用图例示意:

所以,当咱们批改clone.age的时候,实际上批改的是new Student()对象中的Age。而因为wx和clone都执行了new Student(),所以当咱们获取wx.age的时候,获取的也是clone.age的值。

演示:应用&运算符……

或者大家曾经明确了(或者更迷糊了),为什么咱们之前始终反复强调函数的值传递和援用传递,是“传递”而不是“类型”。因为在C#中,传递是传递,类型是类型,总结起来,咱们能够有:

  1. 值类型参数的值传递
  2. 值类型参数的援用传递
  3. 援用类型参数的值传递
  4. 援用类型参数的援用传递

咱们在参数的传递中曾经学习过了1和2,接下来咱们看看3和4。先上办法:

static void grow(Student student) { student.age++; }

接下来进行调用:

Student wx = new Student(); wx.age = 18; grow(wx); Console.WriteLine(wx.age); -- 猜一猜它的后果?

因为上述代码运行之后wx.age变成了19,和值类型参数的援用传递后果相似,所以很多同学会将其间接称之为“援用传递”(尤其是Java中没有ref关键字,这种称说更为风行)。但实际上,重要的事件……,嗯,再说一遍:

C#中除非参数前加修饰符(ref,out等),否则默认就是值传递!

所以,这里依然是参数的值传递,不过咱们之前是值类型的值传递,这里是援用类型的值传递。这里依然是将变量wx的值复制一份,将正本传递给grow()办法。那为什么后果和值类型的值传递成果不一样呢?

留神这里变量wx的值,它具体指的是什么?是age(18)么?不是的哟!应该是 new Student()这个对象的地址。其实整个过程和前文 Student clone = wx; 是一样一样的?因为传递给grow()办法的是对象地址,所以在办法中批改的也就是对象内容,而最初的输入的也是对象的内容(wx.age),所以……

演示:应用&运算符……

为了加深同学们的意识,咱们稍稍的批改一下下面的grow()办法:

static void grow(Student student) { student = new Student(); //减少了一行代码 student.age++; }

如上文个别调用这个办法,后果值是多少呢?为什么?

要害的要害就是新减少的这一行代码让student从新指向了一个新生成的对象,且student.Age++也产生在了新生成的对象中,和之前的变量wx所指向的对象齐全无关。如图所示:

最初,咱们来试一试援用类型的援用传递吧:

static void grow(ref Student student) { student = new Student(); //依然应用减少的这一行代码 student.age++; }

办法调用:

Student wx = new Student(); wx.age = 18; grow(ref wx); //不要遗记了增加ref关键字 Console.WriteLine(wx.age); //猜一猜后果是什么?

竟然是:1,为什么呢?

因为这一次,援用传递会将变量wx间接传递给grow()办法,也就是说,student参数就是wx自身,那么在办法中新new进去的对象地址也就间接赋值给了wx,所以当初wx.age就是0了(字段的默认值),++之后就变成了1。

因为援用类型的援用传递在简单的代码环境中容易让人懵逼,所以微软官网并不举荐应用。通常,咱们应该应用return来实现相似成果:

static Student grow(Student student) { student = new Student(); student.age++; return student; } //同学们要逐步适应这种应用自定义class作为参数和返回值的用法

接着进行调用:

Student wx = new Student(); wx = grow(wx); //留神了解这里的变动 Console.WriteLine(wx.age); //或者: Console.WriteLine(grow(wx).age);

在面试中,问到值类型和援用类型的区别,咱们还应该能答到:

援用类型寄存在堆里,而值类型寄存在栈或者堆中。(堆和栈都是一个逻辑而不是物理概念)

这什么意思呢?

堆和栈

是两种数据结构,但有时候咱们也会把栈称之为“堆栈”,(‾◡◝),飞哥也很无奈,同学们就依据上下文了解吧……

堆最好了解,它是无序的数据汇合,简略的说,就是数据散乱的散布,没有任何组织和法则,就像一堆货物堆在那里一样(温习:SQL无汇集索引表)https://github.com/hdfgfgh546...
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