缺少返回语句

[HGC_SanXi]

class o
{
double he(double a,double b)
{
return a+b;
}
double cha(double a,double b) //7
{
return a-b;
}
double ji(double a,double b)
{
return a*b;
}
}
public class i //16
{
public static double main(String args[])
{
double a1=Double.parseDouble(args[0]);
double b1=Double.parseDouble(args[1]); //21
double h,c,j;
o f=new o();
System.out.println("和为"+f.he(a1,b1)+"差为"+f.cha(a1,b1)+"积为"+f.ji(a1,b1));
}
}

[justlearn]

public static double main(String args[])
{
double a1=Double.parseDouble(args[0]);
double b1=Double.parseDouble(args[1]); //21
double h,c,j;
o f=new o();
System.out.println("和为"+f.he(a1,b1)+"差为"+f.cha(a1,b1)+"积为"+f.ji(a1,b1));
}
这个方法返回类型为double
你最后没有return 任何值

[justlearn]

补充一下，这个是main方法，返回类型应该是void，把方法名改下
如下
public static void main(String args[])
{
double a1=Double.parseDouble(args[0]);
double b1=Double.parseDouble(args[1]); //21
double h,c,j;
o f=new o();
System.out.println("和为"+f.he(a1,b1)+"差为"+f.cha(a1,b1)+"积为"+f.ji(a1,b1));
}

[HGC_SanXi]

感激涕零啊！！！