调试器中的 Step Into 和 Step Over 有什么区别 [英] What is the difference between Step Into and Step Over in a debugger

问题描述

我想调试一个(Java)程序的整个流程.我看到有几个选项可以单步执行我的程序.step into 和 step over 有什么区别?

I want to debug the whole flow of a (Java) program. I see there are several options for stepping through my program. What is the difference between step into and step over?

推荐答案

考虑以下代码与您当前的指令指针(接下来将执行的行，由 -> 表示)在g() 中的 f(x) 行，已被 main() 中的 g(2) 行调用代码>:

Consider the following code with your current instruction pointer (the line that will be executed next, indicated by ->) at the f(x) line in g(), having been called by the g(2) line in main():

public class testprog {
    static void f (int x) {
        System.out.println ("num is " + (x+0)); // <- STEP INTO
    }

    static void g (int x) {
->      f(x); //
        f(1); // <----------------------------------- STEP OVER
    }

    public static void main (String args[]) {
        g(2);
        g(3); // <----------------------------------- STEP OUT OF
    }
}

如果你在那个时候进入，你将移动到f()中的println()行，进入函数调用.

If you were to step into at that point, you will move to the println() line in f(), stepping into the function call.

如果您要在那个点over，您将移动到 g() 中的 f(1) 行，步进在函数调用上.

If you were to step over at that point, you will move to the f(1) line in g(), stepping over the function call.

调试器的另一个有用功能是 out of 或 return 步骤. 在这种情况下，步骤 return 基本上会运行当前函数，直到您返回上一层.换句话说，它将单步执行f(x) 和f(1)，然后返回到调用函数以结束在g(3) 在 main() 中.

Another useful feature of debuggers is the step out of or step return. In that case, a step return will basically run you through the current function until you go back up one level. In other words, it will step through f(x) and f(1), then back out to the calling function to end up at g(3) in main().

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