在调试模式下运行时如何修改java代码？ [英] How to modify java code while running in debug mode?

问题描述

如何启用运行时调试Notch正在此视频中讨论在Eclipse中？

How can I enable this "Debugging in Runtime" Notch is talking about in this video in Eclipse?

作为测试，我希望能够编辑以下代码的输出，并将其更改为Hello Runtime Debugging而且它正在运行。

As a test, I'd like to be able to edit the output of the following code and change it to "Hello Runtime Debugging" while it's running.

public class HelloWorld {
    public static void main(String[] args) throws InterruptedException {
        doIt();     
    }

    private static void doIt() throws InterruptedException {
        for (int i = 0; i < 1000; ++i) {
            System.out.println("Hello World " + i);
            Thread.currentThread().sleep(100);
        }
    }
}

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编辑：我修改了代码，现在我得到了我正在寻找的结果。 Suraj Chandran的回答如下：

---

I modified the code, now I get the results I was looking for. Suraj Chandran's answer below explains it.

private static void doIt() throws InterruptedException {
    for (int i = 0; i < 1000; ++i) {
        print(i);
        Thread.currentThread().sleep(100);
    }
}

private static void print(int i) {
    System.out.println("Hello Sir " + i);
}

推荐答案

Eclipse支持热插拔代码调试，开箱即用。

Eclipse supports hot swapping code during debugging , out of the box.

调试时，只需更改任何代码并保存，eclipse将自动将修改的代码传输到目标VM。

While debugging, just change any code and save it, eclipse will automatically transfer the modified code to the target VM.

请注意，您不能对代码进行结构更改，例如添加新方法，更改方法签名或添加新字段。但是您可以在方法中更改代码。

Note that you can't make structural changes to the code, like adding new methods, changing method signature or adding new fields. But you can change the code within a method.

编辑：请注意，在卸载期间更改代码将使该方法从头开始重新执行，重置局部变量那个方法。

Note that changing the code during deubgging will make that method re-execute form the beginning, resetting the local variables in that method.

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