如何找出Java中对象的标识符？

Question

I am writing some code and I am trying to use System.out.println() to print the name of an object. For example, with the code String foo = new String("Hi"); , I want to print out " foo ". How do I do this?

Answer 1

You cannot do this, for multiple reasons. The simplest one is that one object can be referenced from multiple variables:

String foo = new String("Hi");
String bar = foo;

Now both foo and bar refer to the same String object "Hi" . There is no way to decide on a single identifier.

Names of local variables are, essentially, a compile-time artifact. Once the compiler is done, you cannot access these names without access to the debug information produced when you compile with -g:vars compiler flag .

Answer 2

您提供的对象引用名称不可能在运行时不可用。