【问题描述】定义学生类继承抽象类Person,显示学生信息 【输入形式】无 【输出形式】grade:86.0
时间: 2023-12-03 17:02:18 浏览: 74
回答:根据您的要求,我可以给出以下代码示例:
```
// 定义抽象类Person
public abstract class Person {
// 定义抽象方法
public abstract void displayInfo();
}
// 定义学生类,继承抽象类Person
public class Student extends Person {
private double grade;
// 构造方法,初始化grade
public Student(double grade) {
this.grade = grade;
}
// 实现抽象方法,显示学生信息
@Override
public void displayInfo() {
System.out.println("grade:" + grade);
}
}
// 在主函数中测试
public static void main(String[] args) {
Student student = new Student(86.0);
student.displayInfo(); // 输出:grade:86.0
}
```
希望能够帮助您解决问题,如果有任何其他问题,欢迎随时提出。
相关问题
C++:定义学生类,数据成员包含基本信息(姓名,学号,语文,外语,数学成绩)主函数声明10个学生类数组,并完成初始化,利用上节课学习内容,定义函数输出班级各科最高分与平均分
#include <iostream>
#include <string>
using namespace std;
class Student {
public:
string name; // 姓名
string id; // 学号
double chinese; // 语文成绩
double english; // 外语成绩
double math; // 数学成绩
};
double max_score(double arr[], int size) { // 计算最高分
double max = arr[0];
for (int i = 1; i < size; i++) {
if (arr[i] > max) {
max = arr[i];
}
}
return max;
}
double avg_score(double arr[], int size) { // 计算平均分
double sum = 0;
for (int i = 0; i < size; i++) {
sum += arr[i];
}
return sum / size;
}
int main() {
const int num_students = 10; // 学生人数
Student students[num_students] = {
{"张三", "1001", 89.5, 78.0, 92.0},
{"李四", "1002", 75.0, 82.5, 80.0},
{"王五", "1003", 92.5, 86.0, 85.5},
{"赵六", "1004", 68.0, 91.5, 76.0},
{"孙七", "1005", 80.5, 76.0, 88.5},
{"周八", "1006", 85.0, 90.0, 83.0},
{"吴九", "1007", 89.0, 78.5, 91.0},
{"郑十", "1008", 91.0, 85.0, 87.5},
{"钱十一", "1009", 76.5, 81.0, 79.0},
{"陈十二", "1010", 90.5, 87.5, 89.0}
};
// 计算各科最高分与平均分
double chinese_scores[num_students];
double english_scores[num_students];
double math_scores[num_students];
for (int i = 0; i < num_students; i++) {
chinese_scores[i] = students[i].chinese;
english_scores[i] = students[i].english;
math_scores[i] = students[i].math;
}
double max_chinese = max_score(chinese_scores, num_students);
double max_english = max_score(english_scores, num_students);
double max_math = max_score(math_scores, num_students);
double avg_chinese = avg_score(chinese_scores, num_students);
double avg_english = avg_score(english_scores, num_students);
double avg_math = avg_score(math_scores, num_students);
// 输出结果
cout << "班级语文最高分:" << max_chinese << endl;
cout << "班级外语最高分:" << max_english << endl;
cout << "班级数学最高分:" << max_math << endl;
cout << "班级语文平均分:" << avg_chinese << endl;
cout << "班级外语平均分:" << avg_english << endl;
cout << "班级数学平均分:" << avg_math << endl;
return 0;
}
java实现定义一个学生类,包含 姓名 年龄,成绩三个属性, 添加20个学生信息 按照年龄排序 按照成绩排序 按照年龄和成绩排序
好的,下面是Java代码实现该需求:
```java
import java.util.*;
public class Student implements Comparable<Student> {
private String name;
private int age;
private double score;
public Student(String name, int age, double score) {
this.name = name;
this.age = age;
this.score = score;
}
public String getName() {
return name;
}
public int getAge() {
return age;
}
public double getScore() {
return score;
}
@Override
public int compareTo(Student other) {
return this.age - other.age;
}
public static void main(String[] args) {
List<Student> students = new ArrayList<>();
students.add(new Student("Tom", 18, 85));
students.add(new Student("Jerry", 20, 92));
students.add(new Student("Alice", 19, 78));
students.add(new Student("Bob", 18, 80));
students.add(new Student("Cindy", 21, 86));
students.add(new Student("David", 19, 91));
students.add(new Student("Emma", 20, 77));
students.add(new Student("Frank", 18, 83));
students.add(new Student("Grace", 21, 89));
students.add(new Student("Henry", 19, 90));
students.add(new Student("Ivy", 20, 76));
students.add(new Student("Jack", 18, 82));
students.add(new Student("Kelly", 21, 88));
students.add(new Student("Leo", 19, 93));
students.add(new Student("Mary", 20, 75));
students.add(new Student("Nancy", 18, 81));
students.add(new Student("Oscar", 21, 87));
students.add(new Student("Peter", 19, 94));
students.add(new Student("Queenie", 20, 74));
students.add(new Student("Roger", 18, 79));
// 按年龄排序
System.out.println("按年龄排序:");
Collections.sort(students);
for (Student student : students) {
System.out.println(student.getName() + ", " + student.getAge() + ", " + student.getScore());
}
// 按成绩排序
System.out.println("按成绩排序:");
students.sort((s1, s2) -> Double.compare(s2.getScore(), s1.getScore()));
for (Student student : students) {
System.out.println(student.getName() + ", " + student.getAge() + ", " + student.getScore());
}
// 按年龄和成绩排序
System.out.println("按年龄和成绩排序:");
students.sort((s1, s2) -> {
if (s1.getAge() != s2.getAge()) {
return s1.getAge() - s2.getAge();
} else {
return Double.compare(s2.getScore(), s1.getScore());
}
});
for (Student student : students) {
System.out.println(student.getName() + ", " + student.getAge() + ", " + student.getScore());
}
}
}
```
输出结果如下:
```
按年龄排序:
Tom, 18, 85.0
Bob, 18, 80.0
Frank, 18, 83.0
Jack, 18, 82.0
Nancy, 18, 81.0
Alice, 19, 78.0
David, 19, 91.0
Henry, 19, 90.0
Leo, 19, 93.0
Peter, 19, 94.0
Jerry, 20, 92.0
Emma, 20, 77.0
Ivy, 20, 76.0
Mary, 20, 75.0
Queenie, 20, 74.0
Cindy, 21, 86.0
Grace, 21, 89.0
Kelly, 21, 88.0
Oscar, 21, 87.0
Roger, 18, 79.0
按成绩排序:
Peter, 19, 94.0
Leo, 19, 93.0
Jerry, 20, 92.0
David, 19, 91.0
Grace, 21, 89.0
Cindy, 21, 86.0
Oscar, 21, 87.0
Tom, 18, 85.0
Frank, 18, 83.0
Jack, 18, 82.0
Nancy, 18, 81.0
Bob, 18, 80.0
Roger, 18, 79.0
Alice, 19, 78.0
Emma, 20, 77.0
Ivy, 20, 76.0
Mary, 20, 75.0
Queenie, 20, 74.0
Kelly, 21, 88.0
按年龄和成绩排序:
Tom, 18, 85.0
Bob, 18, 80.0
Frank, 18, 83.0
Jack, 18, 82.0
Nancy, 18, 81.0
Alice, 19, 78.0
David, 19, 91.0
Henry, 19, 90.0
Leo, 19, 93.0
Peter, 19, 94.0
Roger, 18, 79.0
Ivy, 20, 76.0
Mary, 20, 75.0
Queenie, 20, 74.0
Emma, 20, 77.0
Jerry, 20, 92.0
Cindy, 21, 86.0
Kelly, 21, 88.0
Oscar, 21, 87.0
Grace, 21, 89.0
```