编辑代码

public class FarmersLand {
    public static void main(String[] args) {
        System.out.println(test(1680,800));
    }
    public static int test(int len,int wid)
    {
        while(true)
        {
            if(len<wid||len<0||wid<0)
            {
                return -1;
            }
            if(len%wid==0)
            {
                return wid;
            }
            int len1=len;
            int wid1=wid;
            wid=len1%wid;
            len=wid1;
        }
    }
}