当前位置：首页 > news >正文

面向对象练习题

news 来源：原创 2024/9/20 21:25:28

创建四个类：Person类、Student类、Teacher类和Test类

Student类、Teacher类继承Person类

public class Person {
String name;
int age;public Person(String name, int age) {this.name = name;this.age = age;}public String getName() {return name;}public void setName(String name) {this.name = name;}public int getAge() {return age;}public void setAge(int age) {this.age = age;}public String say(){return "名字为："+name+", 年龄为："+age;}
}

public class Student extends  Person{double score;public Student(String name, int age, double score) {super(name, age);this.score = score;}public double getScore() {return score;}public void setScore(double score) {this.score = score;}public String say(){return  "学生"+super.say()+", 成绩为"+score;}//学生私有方法public  void study(){System.out.println("学生"+getName()+"正在学习Java~");}
}

public class Teacher extends Person{
double salary;public Teacher(String name, int age, double salary) {super(name, age);this.salary = salary;}public double getSalary() {return salary;}public void setSalary(double salary) {this.salary = salary;}public String say(){return  "老师"+super.say()+", 工资为"+salary;}public  void teach(){System.out.println("老师"+getName()+"正在教Java~");}
}

public class Test {public static void main(String[] args) {Person[] people=new  Person[5];people[0]=new Person("Tom",38);people[1]=new Student("lxl",18,98);people[2]=new Student("lky",21,78);people[3]=new Teacher("Tm",32,5000);people[4]=new Teacher("lll",48,2000);for (int i = 0; i <people.length ; i++) {System.out.println(people[i].say());if (people[i] instanceof Student) {//判断是否为Student类，否则不能访问study方法//如果不是，强制转换，向下转型Student student = (Student) people[i];student.study();//也可以使用一条语句代替
//                ((Student)people[i]).study();} else if (people[i] instanceof Teacher) {//判断是否为Student类，否则不能访问study方法//如果不是，强制转换，向下转型Teacher teacher = (Teacher) people[i];teacher.teach();} else if (people[i] instanceof Person) {}else {System.out.println("你输入的类型有错误");}}}
}