symbol: variable englishscore location: class Student如何解决
时间: 2024-03-30 12:40:49 浏览: 24
这个错误提示意味着在Student类中,有一个变量名为englishscore的变量未被定义或声明。这个问题可以通过以下几种方式进行解决:
1. 在Student类中声明一个名为englishscore的变量,确保它具有正确的数据类型和访问修饰符。
2. 确保englishscore变量的声明或定义语句被包含在Student类的范围内,而不是在其他类中。
3. 如果englishscore变量是从其他类或父类继承而来的,确保它被正确地继承和初始化。
请注意,在解决此类错误时,需要检查代码中的所有相关类和变量,以确保它们都已正确声明和初始化。
相关问题
public class Student{ private String name;private int age;private int chinesescore;private int mathsscore;private int englishscore; public void Student(String name, int age, int chinesescore, int mathsscore, int englishscore){ this.name=name;this.age=age;this.chinesescore=chinesescore;this.mathsscore=mathsscore;this.englishscore=englishscore; } public static void main(String[] args) { Student student1 = new Student("张三", 18, 80, 90, 85); Student student2 = new Student("李四", 17, 75, 95, 90); Student student3 = new Student("王五", 16, 85, 80, 95); System.out.println(); } } 怎么写才能输出张三李四王五的成绩
要输出张三、李四和王五的成绩,你可以在`Student`类中添加一个公共方法,用于打印学生的成绩。可以按照以下方式修改你的代码:
```java
public class Student {
private String name;
private int age;
private int chinesescore;
private int mathsscore;
private int englishscore;
public Student(String name, int age, int chinesescore, int mathsscore, int englishscore) {
this.name = name;
this.age = age;
this.chinesescore = chinesescore;
this.mathsscore = mathsscore;
this.englishscore = englishscore;
}
public void printScores() {
System.out.println("姓名: " + name);
System.out.println("语文成绩: " + chinesescore);
System.out.println("数学成绩: " + mathsscore);
System.out.println("英语成绩: " + englishscore);
System.out.println();
}
public static void main(String[] args) {
Student student1 = new Student("张三", 18, 80, 90, 85);
Student student2 = new Student("李四", 17, 75, 95, 90);
Student student3 = new Student("王五", 16, 85, 80, 95);
student1.printScores();
student2.printScores();
student3.printScores();
}
}
```
这样,运行`main`方法时,会依次输出每个学生的姓名和成绩。
import java.util.ArrayList; import java.util.Collections; import java.util.Comparator; import java.util.List; public class Student { private String name; private int age; private int chinesescore; private int mathsscore; private int englishscore; public Student(String name, int age, int chinesescore, int mathsscore, int englishscore) { this.name = name; this.age = age; this.chinesescore = chinesescore; this.mathsscore = mathsscore; this.englishscore = englishscore; } public String getName() { return name; } public int getAge() { return age; } public int getch() { return chinesescore; } public int getma() { return mathsscore; } public int geteng() { return englishscore; } public int gettotal() { return englishscore + chinesescore + mathsscore; } public void printScores() { System.out.println(getName()); System.out.println(getAge()); System.out.println(getch()); System.out.println(getma()); System.out.println(geteng()); } public static void main(String[] args) { Student student1 = new Student("张三", 18, 80, 90, 85); Student student2 = new Student("李四", 17, 75, 95, 90); Student student3 = new Student("王五", 16, 85, 80, 95); student1.printScores(); student2.printScores(); student3.printScores(); } List<Student> students = new ArrayList<>(); Comparator<Student> comparator = Comparator.comparing(Student::gettotal) .reversed() .thenComparing(Student::getch, Comparator.reverseOrder()) .thenComparing(Student::getma, Comparator.reverseOrder()) .thenComparing(Student::getAge); Collections.sort(student, comparator); for (Student student : students) { System.out.println(student); } }
这段代码是一个学生类(Student),其中包含学生的姓名(name)、年龄(age)以及语文成绩(chinesescore)、数学成绩(mathsscore)、英语成绩(englishscore)。代码中定义了一个构造函数来初始化学生对象,还有一些用于获取成员变量的方法。在main方法中,创建了三个学生对象并调用了printScores方法来打印学生的成绩。最后,定义了一个students列表来存储学生对象,并使用Comparator对学生对象进行排序,排序规则是先按照总分从高到低排列,如果总分相同则按照语文成绩、数学成绩和年龄进行降序排列。然后通过循环遍历打印排序后的学生对象。
不过我发现代码中有一个错误:在Collections.sort方法中,应该传入的是students列表而不是student。请将代码中的student改为students,如下所示:
```java
Collections.sort(students, comparator);
for (Student student : students) {
System.out.println(student);
}
```
这样就可以正确地对学生对象进行排序并打印出来了。
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