在做包的练习中,当编译"text.java"文件时,报错了...
不知错在哪? (求5!)
程序如下:
package mypackage;
public class factorial{
long s=1L;
public void factorial(long n){
if (n<0)
System.out.println("请输入正数!");
else
inspect(n);
}
final long inspect(long n){
if (n==0) return 1;
return s=s*inspect(n-1);
}
public void printS(){
System.out.println("5!="+s);
}
}

package mypackage1;
import mypackage.factorial;
public class text{
public static void main(String [] args){
factorial f=new factorial(5);
f.printS();
}
}
请大家帮我看一下!

因为factorial没有构造器~~所以只能用默认构造器~default factorial()对于不同包是不可见的!~所以text.java出错!~

public class Factorial{   //最好遵守类名首字母大写规则
    long s;
    public Factorial(long n){ //构造方法无任何返回类型,比较特殊.
        if(n<0)
        System.out.println(\"Please input a positive integer\");
        else
        s=inspect(n); //在此处对实例变量进行赋值
    }
    final long inspect(long n){
        if(n==0)
        return 1;
        else
        return n*inspect(n-1); 
    }
    public void printS(){
        System.out.println(\"5!=\"+s);
    }
}


public class Text{
    public static void main(String[] args){
        Factorial f=new Factorial(5);
        f.printS();
    }
}

呵呵,楼上写的不错~

2楼的,"因为factorial没有构造器" 怎么做啊?

3楼的,,,我这里主要是想做一个关于 包 的练习!

问题解决!

3楼说得对,构造函数没返回类型.

把包放进去就好了!

package mypackage;
public class factorial{
long s=1L;
public factorial(long n){
if (n<0)
System.out.println("请输入正数!");
else
inspect(n);
}
final long inspect(long n){
if (n==0) return 1;
return s=s*inspect(n-1);
}
public void printS(){
System.out.println("5!="+s);
}
}

package mypackage1;
import mypackage.factorial;
public class text{
public static void main(String [] args){
factorial f=new factorial(5);
f.printS();
}
}