下面是我在
linux终端中试过的：编译Test.
java,运行Test.class,并得到一个错误.然后,我尝试使用“-classpath”相同的命令.选项和“-cp”.选项,但也失败.
/testpackage$cat Test.java
package testpackage;
public class Test {
/**
* @param args
*/
public static void main(String[] args) {
// TODO Auto-generated method stub
System.out.println("May I take your order?");
}
}
/testpackage$javac Test.java
/testpackage$java testpackage.Test
Exception in thread "main" java.lang.NoClassDefFoundError: testpackage/Test
Caused by: java.lang.ClassNotFoundException: testpackage.Test
at java.net.URLClassLoader$1.run(URLClassLoader.java:217)
at java.security.AccessController.doPrivileged(Native Method)
at java.net.URLClassLoader.findClass(URLClassLoader.java:205)
at java.lang.ClassLoader.loadClass(ClassLoader.java:321)
at sun.misc.Launcher$AppClassLoader.loadClass(Launcher.java:294)
at java.lang.ClassLoader.loadClass(ClassLoader.java:266)
Could not find the main class: testpackage.Test. Program will exit.
/testpackage$java -cp . testpackage.Test
Exception in thread "main" java.lang.NoClassDefFoundError: testpackage/Test
Caused by: java.lang.ClassNotFoundException: testpackage.Test
at java.net.URLClassLoader$1.run(URLClassLoader.java:217)
at java.security.AccessController.doPrivileged(Native Method)
at java.net.URLClassLoader.findClass(URLClassLoader.java:205)
at java.lang.ClassLoader.loadClass(ClassLoader.java:321)
at sun.misc.Launcher$AppClassLoader.loadClass(Launcher.java:294)
at java.lang.ClassLoader.loadClass(ClassLoader.java:266)
Could not find the main class: testpackage.Test. Program will exit.
/testpackage$java -classpath . testpackage.Test
Exception in thread "main" java.lang.NoClassDefFoundError: testpackage/Test
Caused by: java.lang.ClassNotFoundException: testpackage.Test
at java.net.URLClassLoader$1.run(URLClassLoader.java:217)
at java.security.AccessController.doPrivileged(Native Method)
at java.net.URLClassLoader.findClass(URLClassLoader.java:205)
at java.lang.ClassLoader.loadClass(ClassLoader.java:321)
at sun.misc.Launcher$AppClassLoader.loadClass(Launcher.java:294)
at java.lang.ClassLoader.loadClass(ClassLoader.java:266)
Could not find the main class: testpackage.Test. Program will exit.
/testpackage$
但是如果我删除包“testpackage”并重新编译源代码,则生成的类文件执行得很好.
/testpackage$cat Test.java
//package testpackage;
public class Test {
/**
* @param args
*/
public static void main(String[] args) {
// TODO Auto-generated method stub
System.out.println("May I take your order?");
}
}
/testpackage$javac Test.java
/testpackage$java Test
May I take your order?
/testpackage$
我的代码或执行命令有什么问题？请帮帮我.
谢谢. 原文链接：https://www.f2er.com/java/122625.html
