我已经放置了一个java文件，并在JRE/lib/ext目录中用main方法编译了它。我想从本地java文件访问该文件，甚至没有提到在java中导入它。

C:\Program Files\Java\jre1.8.0_60\lib\ext>cat TestClass.java
class TestClass
{
        public void displayMessage()
        {
                System.out.println("Hello World of Trials");
        }
}

C:\Program Files\Java\jre1.8.0_60\lib\ext>javac TestClass.java

C:\Program Files\Java\jre1.8.0_60\lib\ext>ls -lrt TestClass.*
-rwxrwxr--+ 1 Madhuri        None 103 Jun 17 12:23 TestClass.java
-rwxrwx---+ 1 Administrators None 418 Jun 17 12:25 TestClass.class

C:\Program Files\Java\jre1.8.0_60\lib\ext>


C:\Users\Madhuri\Documents>cat TestArt.java
class TestArt
{
        public static void main(String args[])
        {
                TestClass tc = new TestClass();
                tc.displayMessage();
        }
}

C:\Users\Madhuri\Documents>javac TestArt.java
TestArt.java:5: error: cannot find symbol
                TestClass tc = new TestClass();
                ^
  symbol:   class TestClass
  location: class TestArt
TestArt.java:5: error: cannot find symbol
                TestClass tc = new TestClass();
                                   ^
  symbol:   class TestClass
  location: class TestArt
2 errors

C:\Users\Madhuri\Documents>

• • 一个

从上面的回答，我认为这是可能的。我尝试编译与详细选项，并了解它只接受JAR文件。

C:\Users\Madhuri\Documents>javac -verbose TestArt.java
[parsing started RegularFileObject[TestArt.java]]
[parsing completed 37ms]
[search path for source files: .]
[search path for class files: C:\Program Files\Java\jdk1.8.0_60\jre\lib\resources.jar,C:\Program Files\Java\jdk1.8.0_60\jre\lib\rt.jar,C:\Program Files\Java\jdk1.8.0_60\jre\lib\sunrsasign.jar,C:\Program Files\Java\jdk1.8.0_60
jre\lib\jsse.jar,C:\Program Files\Java\jdk1.8.0_60\jre\lib\jce.jar,C:\Program Files\Java\jdk1.8.0_60\jre\lib\charsets.jar,C:\Program Files\Java\jdk1.8.0_60\jre\lib\jfr.jar,C:\Program Files\Java\jdk1.8.0_60\jre\classes,C:\Prog
am Files\Java\jdk1.8.0_60\jre\lib\ext\access-bridge-64.jar,C:\Program Files\Java\jdk1.8.0_60\jre\lib\ext\cldrdata.jar,C:\Program Files\Java\jdk1.8.0_60\jre\lib\ext\dnsns.jar,C:\Program Files\Java\jdk1.8.0_60\jre\lib\ext\jacce
s.jar,C:\Program Files\Java\jdk1.8.0_60\jre\lib\ext\jfxrt.jar,C:\Program Files\Java\jdk1.8.0_60\jre\lib\ext\localedata.jar,C:\Program Files\Java\jdk1.8.0_60\jre\lib\ext\nashorn.jar,C:\Program Files\Java\jdk1.8.0_60\jre\lib\ex
\sunec.jar,C:\Program Files\Java\jdk1.8.0_60\jre\lib\ext\sunjce_provider.jar,C:\Program Files\Java\jdk1.8.0_60\jre\lib\ext\sunmscapi.jar,C:\Program Files\Java\jdk1.8.0_60\jre\lib\ext\sunpkcs11.jar,C:\Program Files\Java\jdk1.8
0_60\jre\lib\ext\zipfs.jar,.]
[loading ZipFileIndexFileObject[C:\Program Files\Java\jdk1.8.0_60\lib\ct.sym(META-INF/sym/rt.jar/java/lang/Object.class)]]
[loading ZipFileIndexFileObject[C:\Program Files\Java\jdk1.8.0_60\lib\ct.sym(META-INF/sym/rt.jar/java/lang/String.class)]]
[checking TestArt]
[loading ZipFileIndexFileObject[C:\Program Files\Java\jdk1.8.0_60\lib\ct.sym(META-INF/sym/rt.jar/java/io/Serializable.class)]]
[loading ZipFileIndexFileObject[C:\Program Files\Java\jdk1.8.0_60\lib\ct.sym(META-INF/sym/rt.jar/java/lang/AutoCloseable.class)]]
TestArt.java:5: error: cannot find symbol
                TestClass tc = new TestClass();
                ^
  symbol:   class TestClass
  location: class TestArt
TestArt.java:5: error: cannot find symbol
                TestClass tc = new TestClass();
                                   ^
  symbol:   class TestClass
  location: class TestArt
[total 570ms]
2 errors

C:\Users\Madhuri\Documents>

我需要在ext目录中创建一个JAR文件来自动加载它吗？或者有没有办法直接由程序加载类文件？