class B{
int n; //定义n
static int sum=0;//类变量sum
void setN(int n){
this.n=n;
}
int getSum(){
for (int i=1;i<=n;i++)
sum=sum+i;
return sum;
}
}
public class A{
public static void main(String args[]){
B b1=new B(),b2=new B();
b1.setN(3);
b2.setN(5);
int s1=b1.getSum();
int s2=b2.getSum();
System.out.println(s1+s2);
}
}
class A{
double f(double x,double y){
return x+y;
}
}
class B extends A{
double f(int x,int y){
return x*y;
}
}
public class E{
public static void main(String args[]){
B b=new B();
System.out.println(b.f(3,5));
System.out.println(b.f(3.0,5.0));
}
}
class A{
double f(double x,double y){
return x+y;
}
static int g(int n){
return n*n;
}
}
class B extends A{
double f(double x,double y){
double m=super.f(x,y);
return m+x*y;
}
static int g(int n){
int m=A.g(n);
return m+n;
}
}
public class E{
public static void main(String args[]){
B b=new B();
System.out.println(b.f(10.0,8.0));
System.out.println(b.g(3));
}
}