java 同一个包 两个java 文件的调用
目录:E:\apache-tomcat-6.0.33\webapps\Backup\WEB-INF\classes\proDBTools.java:
package pro;
public class DBTools
{····
TelnetSample.java:
package pro;
public class TelnetSample {
```
DBTools DB=new DBTools();
```
java TelnetSample时候出现
Exception in thread "main" java.lang.NoClassDefFoundError: TelnetSample (wrong n
ame: pro/TelnetSample)
at java.lang.ClassLoader.defineClass1(Native Method)
at java.lang.ClassLoader.defineClassCond(Unknown Source)
at java.lang.ClassLoader.defineClass(Unknown Source)
at java.security.SecureClassLoader.defineClass(Unknown Source)
at java.net.URLClassLoader.defineClass(Unknown Source)
at java.net.URLClassLoader.access$000(Unknown Source)
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: TelnetSample. Program will exit.
什么情况啊?
java class --------------------编程问答-------------------- 楼主可以把代码写清楚些吗?怎么看着别扭 --------------------编程问答-------------------- 目录:E:\apache-tomcat-6.0.33\webapps\Backup\WEB-INF\classes\pro
DBTools.java:
————————————————————————————————
package pro;
public class DBTools
{····}//n多代码
————————————————————————————————
TelnetSample.java:
package pro;
public class TelnetSample {
```
DBTools DB=new DBTools();//调用
```
}
————————————————————————————————
java TelnetSample时候出现
Exception in thread "main" java.lang.NoClassDefFoundError: TelnetSample (wrong n
ame: pro/TelnetSample)
at java.lang.ClassLoader.defineClass1(Native Method)
at java.lang.ClassLoader.defineClassCond(Unknown Source)
at java.lang.ClassLoader.defineClass(Unknown Source)
at java.security.SecureClassLoader.defineClass(Unknown Source)
at java.net.URLClassLoader.defineClass(Unknown Source)
at java.net.URLClassLoader.access$000(Unknown Source)
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: TelnetSample. Program will exit.
什么情况啊?
--------------------编程问答-------------------- 就是两个java文件在同一个目录下,并且都在同一个包内,调用出现了问题。代码太多了不好粘。 --------------------编程问答-------------------- 看下编译后的class文件有没有 --------------------编程问答-------------------- 有没有导入DBTools类? --------------------编程问答-------------------- E:\apache-tomcat-6.0.33\webapps\Backup\WEB-INF\classes\pro>javac TelnetSample.ja
va
TelnetSample.java:3: package org.DB does not exist
import org.DB.*;
^
TelnetSample.java:92: cannot find symbol
symbol : class DBTools
location: class pro.TelnetSample
DBTools DB=new DBTools();//连接数据库
^
TelnetSample.java:92: cannot find symbol
symbol : class DBTools
location: class pro.TelnetSample
DBTools DB=new DBTools();//连接数据库
^
3 errors
现在出现这个了,晕啊,不能调用DBTools,为什么啊 --------------------编程问答-------------------- 没有,重新编译又出现不一样的错误了 --------------------编程问答-------------------- TelnetSample名字和文件名是否一致,有没有写错? --------------------编程问答-------------------- TelnetSample.java:3: package org.DB does not exist
import org.DB.*;你的包名到底是什么啊 --------------------编程问答-------------------- 第一个文件TelnetSample.java:
package pro;
import org.apache.commons.net.telnet.*;
import pro.*;
import java.io.*;
第二个文件DBTools.java:
package pro;
两个文件都在E:\apache-tomcat-6.0.33\webapps\Backup\WEB-INF\classes\pro
假如去掉第一个文件的import pro.*;package pro;和第二个文件的package pro;话,就可以正常运行 --------------------编程问答-------------------- E:\apache-tomcat-6.0.33\webapps\Backup\WEB-INF\classes\pro>javac TelnetSample.ja
va
TelnetSample.java:92: cannot find symbol
symbol : class DBTools
location: class pro.TelnetSample
DBTools DB=new DBTools();//连接数据库
^
TelnetSample.java:92: cannot find symbol
symbol : class DBTools
location: class pro.TelnetSample
DBTools DB=new DBTools();//连接数据库
^
不好意思,试了各种方法,原来的代码没改过来,现在是这样的错误了 --------------------编程问答-------------------- 这个没错。请各位大神指教啊,在线等 --------------------编程问答-------------------- 你敢把所有代码取出中间的代码然后把大体的代码完整贴出来吗 我怎么看着这么费劲啊
完全看不出来你的代码到底怎么写的 --------------------编程问答-------------------- 代码肯定是没问题,是调用的问题,因为假如去掉第一个文件的import pro.*;package pro;和第二个文件的package pro;话,就可以正常运行。应该是路径哪有问题。我的调用和IMPORT有问题不? --------------------编程问答-------------------- 你是用javac在控制台编译的吧?
那就应该用>javac -classpath
的参数来编译,否则不可用
补充:Java , Java SE