Exception in thread "main" java.lang.NoClassDefFoundError: HelloWorld/class
Caused by: java.lang.ClassNotFoundException: HelloWorld.class
at java.net.URLClassLoader$1.run(Unknown Source)
at java.security.AccessController.doPrivileged(Native Method)
at java.net.URLClassLoader.findClass(Unknown Source)
at java.lang.ClassLoader.loadClass(Unknown Source)
at sun.misc.Launcher$AppClassLoader.loadClass(Unknown Source)
at java.lang.ClassLoader.loadClass(Unknown Source)
Could not find the main class: HelloWorld.class. Program will exit.java 和 javac命令都可以找到, 系统环境变量 classpath = C:\学习\IBMproject\CrawlProgram;%JAVA_HOME%\lib;%JAVA_HOME%\lib\tools.jar;%JAVA_HOME%\jre\lib\rt.jar;.;查了好多都没找到答案。。在 eclipse里面是可以运行的代码如下:public class HelloWorld {
public void Draw()
{
System.out.println("class HelloWorld");
}
public static void main(String args[])
{
HelloWorld h1 = new HelloWorld();
Child h2 = new Child();
f(h1);
f(h2);
}
public static void f(HelloWorld hw)
{
hw.Draw();
}
}class Child extends HelloWorld
{
public void Draw()
{
System.out.println("class child");
}
}
Caused by: java.lang.ClassNotFoundException: HelloWorld.class
at java.net.URLClassLoader$1.run(Unknown Source)
at java.security.AccessController.doPrivileged(Native Method)
at java.net.URLClassLoader.findClass(Unknown Source)
at java.lang.ClassLoader.loadClass(Unknown Source)
at sun.misc.Launcher$AppClassLoader.loadClass(Unknown Source)
at java.lang.ClassLoader.loadClass(Unknown Source)
Could not find the main class: HelloWorld.class. Program will exit.java 和 javac命令都可以找到, 系统环境变量 classpath = C:\学习\IBMproject\CrawlProgram;%JAVA_HOME%\lib;%JAVA_HOME%\lib\tools.jar;%JAVA_HOME%\jre\lib\rt.jar;.;查了好多都没找到答案。。在 eclipse里面是可以运行的代码如下:public class HelloWorld {
public void Draw()
{
System.out.println("class HelloWorld");
}
public static void main(String args[])
{
HelloWorld h1 = new HelloWorld();
Child h2 = new Child();
f(h1);
f(h2);
}
public static void f(HelloWorld hw)
{
hw.Draw();
}
}class Child extends HelloWorld
{
public void Draw()
{
System.out.println("class child");
}
}
path: C:\Program Files\Java\jdk1.6.0_07\bin;你可以在lib;后加上你编译后的class文件的路径。
然后试试,曾经碰到过,把当前会话中的classpath清掉就好了
运行时为java xxx后面不能跟后最