//主类为Sum 求一到五的和
class S {
int s,i=1;
S(){
s=0;
}
public int add(){
for(i=1;i<=5;i++)
s=s+i;
return s;
}
}
public class Sum{
public static void main(String args[]){
S x=new S();
System.out.println("1到5的和为:"+x.add());
}
}
Microsoft Windows [版本 5.2.3790]
(C) 版权所有 1985-2003 Microsoft Corp.
C:\Documents and Settings\Administrator>cd\
C:\>javac S.java
S.java:13: class Sum is public, should be declared in a file named Sum.java
public class Sum{
^
1 error
C:\>
这咋回事???
就这问题么