面向对象编程: (1)根据UML图定义Student类 (2)编写Student类的子类ComparableStudent类,该子类实现Comparable接口,可以按照学生的成 绩进行比较。 Student -id :int -sCore :int +Student 0 +Student (int id, int score) + getId() +setId (double r) + getScore() :int :void :int +setScore(double score):void + toSting0: :String
时间: 2024-03-03 22:47:00 浏览: 140
根据提供的UML图,我们可以定义如下的`Student`类和`ComparableStudent`类:
1. 定义`Student`类
```
Class: Student
------------------------
- id: int
- score: int
------------------------
+ Student()
+ Student(id: int, score: int)
+ getId(): int
+ getScore(): int
+ setId(id: int): void
+ setScore(score: int): void
+ toString(): String
```
其中,`id`表示学生的ID,`score`表示学生成绩。构造方法包括无参构造方法和有参构造方法,用于初始化学生对象;`getId()`和`getScore()`方法用于获取学生的ID和成绩;`setId()`和`setScore()`方法用于设置学生的ID和成绩;`toString()`方法用于将学生对象转化为字符串。
2. 定义`ComparableStudent`类
```
Class: ComparableStudent extends Student implements Comparable<ComparableStudent>
------------------------
+ ComparableStudent()
+ ComparableStudent(id: int, score: int)
+ compareTo(other: ComparableStudent): int
```
其中,`ComparableStudent`是`Student`类的子类,实现了`Comparable`接口,因此可以进行比较。`compareTo()`方法实现了按照学生成绩进行比较,返回一个整数值,如果当前对象的成绩大于参数对象的成绩,返回正整数;如果当前对象的成绩小于参数对象的成绩,返回负整数;如果当前对象的成绩等于参数对象的成绩,返回0。
例如:
```java
public class ComparableStudent extends Student implements Comparable<ComparableStudent> {
public ComparableStudent() {
super();
}
public ComparableStudent(int id, int score) {
super(id, score);
}
@Override
public int compareTo(ComparableStudent other) {
if (this.getScore() > other.getScore()) {
return 1;
} else if (this.getScore() < other.getScore()) {
return -1;
} else {
return 0;
}
}
}
```
这样,我们就定义了`Student`类和`ComparableStudent`类,可以根据学生成绩进行比较。
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