java -jar：默认的 class 路径是什么？

Question

在 jar 文件中，MANIFEST.mf 包含以下行：

款式A：

Class-Path: .

风格B：

Class-Path: . eric-java-util_lib/tomcat-api.jar

样式 C:

// No `Class-Path` specified.

问题：

样式B中，Class-Path指定的jar是否与当前jar的驻留目录相关？
那么在风格A和风格B中，.是什么意思呢？是未压缩的 jar 根目录，还是当前 jar 的驻留目录？我想应该是后者，但不确定。
似乎类和 MANIFEST.mf 之外的包也包含在所有 3 种样式的类路径中，是由于 . 吗？或者，java -jar 的默认类路径只是解压 jar 文件的根目录？

Answer 1

In style B, is the jar specified by Class-Path related to residing dir of current jar?

是的（请参阅下面的 Java SE 文档注释）。

Then in style A and B, what does . mean? Is it uncompressed root dir of jar, or the residing dir of current jar? I guess it should be the later, but not sure.

它是 jar 的驻留目录（参见下面的 Java SE 文档）。

It seems classes & packages besides MANIFEST.mf are also included in classpath in all the 3 styles, is it due to .? Or, the default classpath for java -jar is just the root dir of uncompress jar file?

如Java SE Documentation: How the Java Launcher Finds User Classes所述：

The default value, ".", meaning that user class files are all the class files in the current directory (or under it, if in a package).

...

The JAR archive specified by the -jar option, which overrides all other values. If this option is used, all user classes must come from the specified archive.

Answer 2

当您使用 java -jar时，以下内容适用：

In style B, is the jar specified by Class-Path related to residing dir of current jar?

所有款式都和'residing dir of current jar'有关

Then in style A and B, what does . mean?

表示.jar文件所在目录

Is it uncompressed root dir of jar

没有

or the residing dir of current jar?

是的。

I guess it should be the later, but not sure.

是的。确定。

It seems classes & packages besides MANIFEST.mf are also included in classpath in all the 3 styles, is it due to .?

我不知道'besides MANIFEST.mf'是什么意思。

Or, the default classpath for java -jar is just the root dir of uncompress jar file?

java -jar 除了 .jar 文件本身和 Class-Path 清单条目中指定的任何内容外，没有默认类路径。

java -jar：默认的 class 路径是什么？

java -jar: What's the default class path?

java

jar

manifest

classpath