class Shulie
{
int a,d,n,sum;
void setA(a)
{
this.a=a;
}
public void setD(d)
{
this.d=d;
}
public void setN(n)
{
this.n=n;
}
public void setSum(a)
{
this.Sum=a;
}
Shulie he()
{
inti=1;
for(i=1,i<=n,i++)
{
sum=sum+d;
}
return sum;
}
}
public class lp0
{
public static void main(String arg[])
{
Shulie shulie=new he();
shulie.setA(2);
shulie.setN(10);
shulie.setD(2);
shulie.setSum();
System.out.println("数列和是"+shulie.setSum());
}
}

错在那里了呀

错得比较简单..你的参数里的值..没有指定类型..
还有..我的setsum方法..不知道是干什么的..从你的代码来看..应该是要得到sum的值..
那样的话..就做个getSum()的方法..在里面return sum;

class Shulie
{
int a,d,n,sum;
void setA(a)
{
this.a=a;
}
public void setD(d)
{
this.d=d;
}
public void setN(n)
{
this.n=n;
}
public void setSum()
{
this.Sum=a;
}
Shulie he()
{
inti=1;
for(i=1,i<=n,i++)
{
sum=sum+d;
}
return sum;
}
}
public class lp0
{
public static void main(String arg[])
{
Shulie shulie=new he();
shulie.setA(2);
shulie.setN(10);
shulie.setD(2);
shulie.setSum();
System.out.println("数列和是"+shulie.setSum());
}
}

class Shulie
{
int a,d,n,sum;
public void setA(int a)
{
this.a=a;
}
public void setD(int d)
{
this.d=d;
}
public void setN(int n)
{
this.n=n;
}
public void setSum(int a)
{
this.sum=a;
}
public int he()
{
int i=1;
for(i=1;i <= n;i++)
{
sum=sum+d;
}
return sum;
}
}
public class lp0
{
public static void main(String arg[])
{
Shulie shulie=new Shulie ();
shulie.setA(2);
shulie.setN(10);
shulie.setD(2);
//shulie.setSum(2);
System.out.println("数列和是"+shulie.he());
}
}

Shulie shulie=new Shulie ();shulie.setA(2);shulie.setSum(2);重复了 你的a可以不要啊

错误好多啊 怎么自己开始不改改啊

谢谢．我刚学谢谢大哥

我想把a的值传给sum上面的方法可以吗？