怎么helloworld程序无法运行？

liu_y_f 2005-01-02 06:17:23

我己经在记事本中写好程序，程序如下：
public class HelloWorldApp {//an application
public static void main (String args[ ]){
System.out.println("Hello World!");
}
}
并把它保存到了c盘下HelloWorldApp.java，也装好了jdk,
可是我输入c:>javac HelloWorldApp.java回车以后就提示

C:\>javac HelloWorldApp.java
error: cannot read: HelloWorldApp.java
1 error
请帮忙分析是什么问题？

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hu_an_xiong 2005-01-13

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肯定保存有问题

hscartoon 2005-01-11

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肯定保存为.txt文件了。建议使用IDE（推荐Eclipse）！！！

123xxx 2005-01-02

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有可能是文件类型的问题，你在c盘下用dir看看那个文件究竟是*.java还是*.java.txt。然后classpath的最前面加上".;"---把当前路径设置到classpath中，要不然你编译通过之后用java命令执行时也可能会出问题

liuguangliang 2005-01-02

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这个不可能是环境变量的问题，肯定是文件名不对
可能是保存为.txt文件了

liu_y_f 2005-01-02

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C:\>javac HelloWorldApp.java
error: cannot read: HelloWorldApp.java
1 error

C:\>javac HelloWorldApp.java.txt
javac: invalid flag: HelloWorldApp.java.txt
Usage: javac <options> <source files>
where possible options include:
-g Generate all debugging info
-g:none Generate no debugging info
-g:{lines,vars,source} Generate only some debugging info
-nowarn Generate no warnings
-verbose Output messages about what the compiler is doing
-deprecation Output source locations where deprecated APIs are us
ed
-classpath <path> Specify where to find user class files
-sourcepath <path> Specify where to find input source files
-bootclasspath <path> Override location of bootstrap class files
-extdirs <dirs> Override location of installed extensions
-d <directory> Specify where to place generated class files
-encoding <encoding> Specify character encoding used by source files
-source <release> Provide source compatibility with specified release
-target <release> Generate class files for specific VM version
-help Print a synopsis of standard options

C:\>java HelloWorldApp
Exception in thread "main" java.lang.NoClassDefFoundError: HelloWorldApp

？？？？

limitmx 2005-01-02

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你那个文件是HelloWorldApp.java吗?
不会是HelloWorldApp.java.txt吧?

angelface 2005-01-02

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args[ ]
多了一个空格？

liu_y_f 2005-01-02

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晕倒死就是晕倒死

liu_y_f 2005-01-02

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C:\>java
Usage: java [-options] class [args...]
(to execute a class)
or java -jar [-options] jarfile [args...]
(to execute a jar file)

where options include:
-client to select the "client" VM
-server to select the "server" VM
-hotspot is a synonym for the "client" VM [deprecated]
The default VM is client.

-cp -classpath <directories and zip/jar files separated by ;>
set search path for application classes and resources
-D<name>=<value>
set a system property
-verbose[:class|gc|jni]
enable verbose output
-version print product version and exit
-showversion print product version and continue
-? -help print this help message
-X print help on non-standard options
-ea[:<packagename>...|:<classname>]
-enableassertions[:<packagename>...|:<classname>]
enable assertions
-da[:<packagename>...|:<classname>]
-disableassertions[:<packagename>...|:<classname>]
disable assertions
-esa | -enablesystemassertions
enable system assertions
-dsa | -disablesystemassertions
disable system assertions
运行java以后是这样

liu_y_f 2005-01-02