class Employee; class Manager extends Employee; class Director extends Employee;

2021-04-14

class Employee; class Manager extends Employee; class Director extends Employee;

答案：

Employee e=new Manager();

举一反三

已知：class Employee;class Manager extends Employee;class Director extends Employee;则以下语句能通过编译的有哪些？ A: Employee e = new Manager(); B: Director d = new Manager(); C: Director d = new Employee(); D: Manager m = new Director()
已知类的继承关系 class Employee; class Manager extends Employee; class Director extands Employee; class Director extands Employee; 下语句能通过编译的有哪些?
已知类的继承关系如下： class Employee; class Manager extends Employee; class Director extends Employee; 则以下语句能通过编译的有哪些？
import java.io.*; class Person{ public void print(){System.out.print("Person ");} public void printMyGender(String s){ this.print(); System.out.print(s+" "); } } class Gender{ String type="gender"; public void print(Person p){p.printMyGender(type);} } class Female extends Gender{ public Female(){ type="female"; } } class Male extends Gender{ public Male(){ type="male"; } } class Employee extends Person{ public void print(){ System.out.print("Employee ");} } class Manager extends Employee{ public void print(){ System.out.print("Manager ");} } public class Test{ public static void main(String[] args){ Manager man = new Manager(); Employee em = new Employee(); Gender gender1 = new Male(); Gender gender2 = new Female(); gender1.print(man); gender2.print(em); } } 对于以上代码，其运行结果是
Which two demonstrate an “is a” relationship？（） A: public interface Person{} public class Employee extends Person{} B: public interface Shape{} public class Employee extends Shape{} C: public interface Color{} public class Employee extends Color{} D: public class Species{} public class Animal （private Species species；） E: interface Component{} Class Container implements Component （ Private Component[ ] children；）

内容

0
import java.io.*; class Person{ public void print(){System.out.print("Person ");} public void printMyGender(String s){ this.print(); System.out.print(s+" "); } } class Gender{ String type="gender"; public void print(Person p){p.printMyGender(type);} } class Female extends Gender{ public Female(){ type="female"; } } class Male extends Gender{ public Male(){ type="male"; } } class Employee extends Person{ public void print(){ System.out.print("Employee ");} } class Manager extends Employee{ public void print(){ System.out.print("Manager ");} } public class Test{ public static void main(String[] args){ Manager man = new Manager(); Employee em = new Employee(); Gender gender1 = new Male(); Gender gender2 = new Female(); gender1.print(man); gender2.print(em); } } 对于以上代码，其运行结果是
1
在C#中假设Class1是一个类，而IExample是一个接口，下面的（）类声明是正确的。 A: class Employee: Class1, IExample B: class Employee: IExample, Class1 C: class Employee- Class1, IExample D: class Employee: Class1/Iexample
2
‎阅读以下程序，说明Company类和Employee类是关系。‎‎public class Company{ private Employee employee; public Employee getEmployee(){ return employee; } public void setEmployee(Employee employee){ this.employee=employee; } //公司运作 public void run(){ employee.startWorking(); } }‎
3
已知 import java.io.*;class Person{public static void print(){System.out.print("Person");}} class Employee extends Person{ public void print(){ System.out.print("Employee");}}class Manager extends Employee{ public void print(){ System.out.print("Manager");}}public class Test{ public static void main(String[] args){ Manager man = new Manager(); Employee emp1 = new Employee(); Employee emp2 = (Employee)man; Person person = (Person)man; emp2.print(); System.out.print("#"); person.print();}}对于以上代码，其输出结果是
4
According to the class, which of the following is NOT the effect of the employee training and development?