abstract public class SinhVien {
public String hoTen;
abstract public double getDiem();
}
===========================================
public class SinhVienIT extends SinhVien {
double diemJava;
double diemC;
@Override
public double getDiem() {
return (this.diemJava + this.diemC);
}
}
==========================================
public class Main {
public static void main(String[] args) {
SinhVienIT sinhVienIT = new SinhVienIT();
sinhVienIT.diemC = 7;
sinhVienIT.diemJava = 8;
double tong = sinhVienIT.getDiem();
System.out.println("Tong diem: " + tong);
}
}