调试时，如何直接在IDE中观看其他对象的私有领域？ [英] How can I watch private fields of other objects directly in the IDE when debugging?

问题描述

C＃是我最喜欢的语言，但在工作时要做Java。我想你可以说我非常喜欢使用Visual Studio IDE。我喜欢它的调试器之一是我可以把手表变量（表达式在Eclipse中）用于任何表达式。所以我可以在调试时仔细查看特定的公有或非公开的字段的值，调用方法等等。没有问题。

C# is the language I am most comfortable with but do Java when at work. I guess you can say I am very comfortable with using the Visual Studio IDE. One of the things I enjoyed about its debugger is that I can put watch variables ("Expressions" in Eclipse) for any expression. So I could take a peek at values of specific fields public or non-public, call methods, etc. with no problem as I am debugging.

似乎没有像我可以在Eclipse中做同样的事情。我必须要求调用该字段的相关getter方法（假设它有一个）。如果没有，我需要暂时添加一个，所以我可以查看它，并记得删除它，当我完成或我只是SOL。

It doesn't seem like I can do the same in Eclipse. I have to resort to calling the associated getter method for the field (assuming it has one). If it doesn't have one, I either have to temporarily add one so I can view it and remember to remove it when I'm done or I'm just SOL.

如何在一个私有字段上放置一个对象的表达式？或者我只是做错了，我必须制作特殊表达来查看他们？

_{（或者，有没有更好的方法来获取我想要的信息？）}

How can I put a watch expression for an object on one of its private fields? Or am I just doing it wrong and I have to craft special expressions to view them?
_{(Or is there a better way for me to get the information that I want?)}

例如，

我有一个 HttpServletRequest 并希望关注 requestURI 。如果我只是看请求变量，它列出了很多的字段，它只是太多的信息。我只对对象中的一件事情感兴趣，所以最小化这个，我想添加一个表的表达式。

I have an HttpServletRequest and want to keep an eye on the requestURI. If I just watch the request variable, it lists a lot of its fields and it's just too much information. I'm only interested in one thing in the object so to minimize this, I want to add a watch expression for that one thing.

字段名称显然是 requestURI 所以我添加了表达式： request.requestURI 。 Eclipse抛出一个错误，表示它不是一个字段（它只是不公开）。而不是直接到现场，我不得不去getter： request.getRequestURI（），这样做不错。但是我不能总是指望吸气剂可用。

The field name is apparently requestURI so I added the expression: request.requestURI. Eclipse throws an error saying it's not a field (it is, it's just not public). Instead of going directly to the field, I had to go to the getter: request.getRequestURI() and that works fine. But I can't always count on the getter being available.

变量视图

表达式视图

推荐答案

Eclipse评估表达式，考虑到声明类型的私有/受保护字段，而不是实际类型。

The Eclipse evaluates expression considering the private/protected fields of Declared Type, not of Actual Type.

示例：

Number n1 = new Integer(1000);
Integer n2 = new Integer(1000);

表达式：

n1.value  can't be evaluate
n2.value  returns 1000, perfectly

另一种方法是使用 DetailFormatter （右键单击变量> New Detail Formatter）。

An alternative is use DetailFormatter (right-click in variable > New Detail Formatter).

Eclipse当显示类型对象的文本表示（例如，在变量视图中）时，将使用此表达式而不是toString（）方法。

The Eclipse will use this expression instead of toString() method when the textual representation of a object of type is displayed (in Variables View, for example).

您的 DetailFormatter （for ApplicationHttpRequest ）可以是：

Your DetailFormatter (for ApplicationHttpRequest) can be:

requestURI 

或

"URI: " + requestURI + "\n" +
"Path: " + servletPath

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