Figure 24 shows how to add a breakpoint to line 47 of your servlet, where you declare the variable numB.

图24显示出如何在servlet的第47行(声明了变量numB)加入断点。

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Imagine writing two methods that each declare a locale variable with the exact same name.

想象一下，如果写了两个方法，每个都声明了一个局部变量，且名字一致。

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The first line USES the val keyword to declare a read-only variable named book.

在第一行我们使用了val关键字来声明一个只读变量book。

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What's going on underneath the hood is we'll see pictorially X today is that when I declare this X, this variable X here.

底下所做的，我们将看到,当我声明这个X，这个变量。

哈佛公开课 - 计算机科学课程节选

When you declare a pointer yourself manually, you do say char * the variable name because recall that's the same thing that we did earlier but we called it instead string.

当你手动声明一个指针是，你可以说char，*，变量名字,因为那是我早些时候做的事情,但是我们叫它为字符串。

哈佛公开课 - 计算机科学课程节选

And actually, if I don't want to clobber, as we say, overwrite the value of my variable, ; I could declare another one and store the return value in Y; Y so now I have two ints in memory; X and Y, 3 one with two, one with three.

实际上，如果你不想彻底清除，像我们说的，覆盖那个变量的值，我可以申明另一个变量Y，并在Y中保存那个返回值;,现在内存中有两个int数，X和，一个的值为2，一个为。

哈佛公开课 - 计算机科学课程节选