我的代码如下:
package chapter4;/**
* @author Administrator
*
* TODO To change the template for this generated type comment go to
* Window - Preferences - Java - Code Style - Code Templates
*/public class Factorial_4_1 { public static void main(String[] args) {
try{
int n;
//n=Integer.valueOf(args[0]).intValue();
//Integer.valueOf(args[0]).intValue();
System.out.println("The result is:"+calFactorial(5));
//calFactorial(5);
}catch(NumberFormatException e){
System.out.println("Invalid input value:"+e.getMessage());
System.out.println("The input value must be integers.");
}
catch(IllegalArgumentException e){
System.out.println("Invalid input value:"+e.getMessage());
System.out.println("The input value must be positive number");
}}
public static int calFactorial (int n)
{ int init=1,result=1;
for(;init<=n;init++)
{
result=result*init;
}
return result;
}
}在eclipse里面得到计算结果是120,可是在命令行界面里编译可以通过,但是一执行如下命令:
java Factorial_4_1 就要报错,如下所示:G:\java\myWorkSpace\myJava\chapter4>java Factorial_4_1
Exception in thread "main" java.lang.NoClassDefFoundError: Factorial_4_1 (wrong name: chapter4/Factorial_4_1)
at java.lang.ClassLoader.defineClass0(Native Method)
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$100(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)
at java.lang.ClassLoader.loadClassInternal(Unknown Source)请问这是怎么回事呢?
package chapter4;/**
* @author Administrator
*
* TODO To change the template for this generated type comment go to
* Window - Preferences - Java - Code Style - Code Templates
*/public class Factorial_4_1 { public static void main(String[] args) {
try{
int n;
//n=Integer.valueOf(args[0]).intValue();
//Integer.valueOf(args[0]).intValue();
System.out.println("The result is:"+calFactorial(5));
//calFactorial(5);
}catch(NumberFormatException e){
System.out.println("Invalid input value:"+e.getMessage());
System.out.println("The input value must be integers.");
}
catch(IllegalArgumentException e){
System.out.println("Invalid input value:"+e.getMessage());
System.out.println("The input value must be positive number");
}}
public static int calFactorial (int n)
{ int init=1,result=1;
for(;init<=n;init++)
{
result=result*init;
}
return result;
}
}在eclipse里面得到计算结果是120,可是在命令行界面里编译可以通过,但是一执行如下命令:
java Factorial_4_1 就要报错,如下所示:G:\java\myWorkSpace\myJava\chapter4>java Factorial_4_1
Exception in thread "main" java.lang.NoClassDefFoundError: Factorial_4_1 (wrong name: chapter4/Factorial_4_1)
at java.lang.ClassLoader.defineClass0(Native Method)
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$100(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)
at java.lang.ClassLoader.loadClassInternal(Unknown Source)请问这是怎么回事呢?
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就需要在project目录下执行 java chapter4.Factorial_4_1