public class Student { private String name; private String id; private String gender; private int age; private String major; public Student(String name, String id, String gender, int age, String major) { this.name = name; this.id = id; this.gender = gender; this.age = age; this.major = major; } // getter and setter methods}
时间: 2023-06-25 16:05:38 浏览: 99
这是一个Java类,名为Student,它有5个私有属性,分别是name、id、gender、age和major。它还有一个构造函数,用于初始化这些属性的值。此外,它还包含一些getter和setter方法,用于获取和设置属性值。这个类的作用可能是表示一个学生对象,可以用于在学生信息管理系统中进行学生信息的存储和操作。
相关问题
创建抽象类Human,添加如下属性:姓名(name)、年龄(age)、性别(gender)。添加抽象方法: String getDescription();//获取身份信息 创建Student类继
继续上述内容,你可以按照以下步骤创建一个名为`AbstractHuman`的抽象类,并在其中包含指定的属性和抽象方法:
```java
public abstract class AbstractHuman {
// 定义属性
private String name;
private int age;
private String gender;
// 构造函数
public AbstractHuman(String name, int age, String gender) {
this.name = name;
this.age = age;
this.gender = gender;
}
// 抽象方法
public abstract String getDescription();
// 其他可能的实用方法(如 getters 和 setters)
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 getGender() {
return gender;
}
public void setGender(String gender) {
this.gender = gender;
}
}
```
接着,你可以创建一个名为`Student`的具体子类,来实现`AbstractHuman`中的抽象方法`getDescription()`:
```java
public class Student extends AbstractHuman {
private String major; // 学生专业
public Student(String name, int age, String gender, String major) {
super(name, age, gender);
this.major = major;
}
@Override
public String getDescription() {
return "这是一个名叫" + name + "的大学生,今年" + age + "岁,主修" + major;
}
}
```
在这个例子中,`Student`类会有一个具体的`getDescription()`实现,当需要描述学生身份时,会包含他们的专业。
使用java完成下列任务1. Read the sample code listing 5.1 to 5.3 of Core Java. 2. Implement a class of Person including fields of id, name, gender, age, and the methods to access these fields as well as a desciption function. 3. Implement a class of Student that inherits the Person class by adding additional fields of major and gpa. In addition, the methods include the accessors to get all the fields, respectively. 4. Rewrite the description function, and test it using three kinds of initializations.
Sure, I can help you with that. Here is the solution to your problem:
1. Sample code listing 5.1 to 5.3 of Core Java:
```
//listing 5.1
public class Manager extends Employee {
private double bonus;
public Manager(String name, double salary, int year, int month, int day) {
super(name, salary, year, month, day);
bonus = 0;
}
public double getSalary() {
double baseSalary = super.getSalary();
return baseSalary + bonus;
}
public void setBonus(double bonus) {
this.bonus = bonus;
}
}
//listing 5.2
public class Employee {
private String name;
private double salary;
private LocalDate hireDay;
public Employee(String name, double salary, int year, int month, int day) {
this.name = name;
this.salary = salary;
hireDay = LocalDate.of(year, month, day);
}
public String getName() {
return name;
}
public double getSalary() {
return salary;
}
public LocalDate getHireDay() {
return hireDay;
}
public void raiseSalary(double byPercent) {
double raise = salary * byPercent / 100;
salary += raise;
}
}
//listing 5.3
public class ManagerTest {
public static void main(String[] args) {
Manager boss = new Manager("Carl Cracker", 80000, 1987, 12, 15);
boss.setBonus(5000);
Employee[] staff = new Employee[3];
staff[0] = boss;
staff[1] = new Employee("Harry Hacker", 50000, 1989, 10, 1);
staff[2] = new Employee("Tommy Tester", 40000, 1990, 3, 15);
for (Employee e : staff) {
System.out.println("name=" + e.getName() + ",salary=" + e.getSalary());
}
}
}
```
2. Implementation of a class of Person including fields of id, name, gender, age, and the methods to access these fields as well as a description function:
```
public class Person {
private int id;
private String name;
private String gender;
private int age;
public Person(int id, String name, String gender, int age) {
this.id = id;
this.name = name;
this.gender = gender;
this.age = age;
}
public int getId() {
return id;
}
public String getName() {
return name;
}
public String getGender() {
return gender;
}
public int getAge() {
return age;
}
public String getDescription() {
return "ID: " + id + ", Name: " + name + ", Gender: " + gender + ", Age: " + age;
}
}
```
3. Implementation of a class of Student that inherits the Person class by adding additional fields of major and gpa. In addition, the methods include the accessors to get all the fields, respectively:
```
public class Student extends Person {
private String major;
private double gpa;
public Student(int id, String name, String gender, int age, String major, double gpa) {
super(id, name, gender, age);
this.major = major;
this.gpa = gpa;
}
public String getMajor() {
return major;
}
public double getGpa() {
return gpa;
}
public String getDescription() {
return super.getDescription() + ", Major: " + major + ", GPA: " + gpa;
}
}
```
4. Rewrite the description function, and test it using three kinds of initializations:
```
public static void main(String[] args) {
// initialization 1
Person person1 = new Person(1, "John", "Male", 30);
System.out.println(person1.getDescription());
// initialization 2
Person person2 = new Person(2, "Jane", "Female", 25);
System.out.println(person2.getDescription());
// initialization 3
Student student1 = new Student(3, "Mike", "Male", 20, "Computer Science", 3.8);
System.out.println(student1.getDescription());
}
```
Output:
```
ID: 1, Name: John, Gender: Male, Age: 30
ID: 2, Name: Jane, Gender: Female, Age: 25
ID: 3, Name: Mike, Gender: Male, Age: 20, Major: Computer Science, GPA: 3.8
```
I hope this solution helps you. Let me know if you have any questions or need further assistance.
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