Question

将以<代码>java的选项添加或取代<代码>的内容。缩略语

Answer 1

采用类别变量,它超越了环境变量的CLASSPATH,但仅限于该届会议。如果你重新开始申请,你需要再次确定阶级变量。

Answer 2

是的。摘自java(1) man page:

   -classpath classpath
   -cp classpath
          Specifies a list of directories, JAR archives, and ZIP archives to search  for  class  files.   Class
          path  entries  are separated by colons (:). Specifying -classpath or -cp overrides any setting of the
          CLASSPATH environment variable.

          If -classpath and -cp are not used and CLASSPATH is not set, the user class path consists of the cur-
          rent directory (.).

Answer 3

这两种选择中都使用了一种,而不是两种。

鉴定——等级或――顺序高于一切环境变量。

............

优先选择“等级”办法,因为你可以单独确定每项申请,而不影响其他申请,而没有其他更改其价值的申请。

............

设定CLASSPATH变量或使用——等级指挥线选择高于这一缺省,因此,如果你想把目前的目录列入搜索道路,你就必须在新的环境下“......”。

Answer 4

使用——丙皮办法不会影响阿盟环境变量。

你可以尝试这一小的法典,以检查:

public class CPTest {
    public static void main (final String[] args) {
        String cp = System.getenv("CLASSPATH");
        System.out.println(cp);
    }
}

%echo $CLASSPATH  
/home/test/:.

产出没有-选择:

%java CPTest  
/home/test/:.

a. 产出-p办法:

%java -cp /home/xanadu:. CPTest  
/home/test/:.

两种职业的产量相同(一种为零,一种为零)。

Also either the path specified in the CLASSPATH environment variable is
used or the path specified with -cp option is used. It is not a mix of both it is one of them.

This is evident from the below invocation. If the CWD (current working directory ".")
is excluded from -cp option, the JVM launcher (i.e. java) cannot find the
class file despite the CLASSPATH environment variable containing CWD (".") in it.

%java -cp /home/test CPTest
Exception in thread "main" java.lang.NoClassDefFoundError: CPTest

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