Ubuntu中文论坛

sudo apt-get install sun-java6-jre
sudo apt-get install sun-java6-jdk

sudo update-alternatives --config java

perl: warning: Setting locale failed.
perl: warning: Please check that your locale settings:
LANGUAGE = (unset),
LC_ALL = (unset),
LANG = "en_US.UTF-8"
are supported and installed on your system.
perl: warning: Falling back to the standard locale ("C").

There are 5 alternatives which provide `java'.

Selection Alternative
-----------------------------------------------
+ 1 /usr/lib/jvm/java-gcj/jre/bin/java
2 /usr/local/Evermore/EIOffice/Jre/bin/java
3 /usr/bin/gij-4.2
4 /usr/bin/gij-4.3
* 5 /usr/lib/jvm/java-6-sun/jre/bin/java

sudo gedit /etc/environment

• PATH="/usr/lib/jvm/java-6-sun/bin:/usr/local/sbin:/usr/local/bin:/usr/sbin:/usr/bin:/sbin:/bin:/usr/games"
  LANGUAGE="en_US:en"
  LANG="en_US.UTF-8"
  CLASSPATH=.:/usr/lib/jvm/java-6-sun/lib
  JAVA_HOME=/usr/lib/jvm/java-6-sun[/quote]
  
  

  sudo gedit /etc/jvm

  没有这个文件。。。。不管了新建了这个文件，加入了/usr/lib/jvm/java-6-sun一行，保存
  
  然后安装eclipse配置一下如图。然后用eclipse一切正常。
  在终端里java HelloWorld就是以下错误

  Exception in thread "main" java.lang.NoClassDefFoundError: HelloWorld (wrong name: mypackage/HelloWorld)
  at java.lang.ClassLoader.defineClass1(Native Method)
  at java.lang.ClassLoader.defineClass(ClassLoader.java:621)
  at java.security.SecureClassLoader.defineClass(SecureClassLoader.java:124)
  at java.net.URLClassLoader.defineClass(URLClassLoader.java:260)
  at java.net.URLClassLoader.access$000(URLClassLoader.java:56)
  at java.net.URLClassLoader$1.run(URLClassLoader.java:195)
  at java.security.AccessController.doPrivileged(Native Method)
  at java.net.URLClassLoader.findClass(URLClassLoader.java:188)
  at java.lang.ClassLoader.loadClass(ClassLoader.java:307)
  at sun.misc.Launcher$AppClassLoader.loadClass(Launcher.java:301)
  at java.lang.ClassLoader.loadClass(ClassLoader.java:252)
  at java.lang.ClassLoader.loadClassInternal(ClassLoader.java:320)
  Could not find the main class: HelloWorld. Program will exit.

  
  HelloWorld的内容是

  package mypackage;
  
  /**
  * @author lqqwd
  *
  */
  public class HelloWorld {
  private String world="World";
  public void say(){
  System.out.println("Hello"+world+"!");
  }
  
  
  /**
  * @param args
  */
  public static void main(String args[]) {
  // TODO Auto-generated method stub
  HelloWorld inst=new HelloWorld();
  inst.say();
  
  }
  
  }

  我是一个才开始自学java的新手，以前学过pascal和C。。但都是在win下。想在ubuntu下学习java。这个问题困扰我两天了。望高手来解答