尽管我已经实现了该方法,但我不确定为什么会出现以下错误。
在实现比较方法时,NameComparator.java 中的“NameComparator 类型的方法compare(Student, Student) 必须重写或实现父类(super class)型方法”
学生.java
public class Student {
private String name;
private int age;
private String lesson;
private int grade;
public Student() {
}
public Student(String name, int age, String lesson, int grade) {
super();
this.name = name;
this.age = age;
this.lesson = lesson;
this.grade = grade;
}
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 getLesson() {
return lesson;
}
public void setLesson(String lesson) {
this.lesson = lesson;
}
public int getGrade() {
return grade;
}
public void setGrade(int grade) {
this.grade = grade;
}
@Override
public String toString() {
return "[name=" + this.name + ", age=" + this.age + ", lesson="
+ this.lesson + ", grade=" + this.grade + "]";
}
}
NameComparator.java
import java.util.Comparator;
@SuppressWarnings("rawtypes")
public class NameComparator implements Comparator {
// I’m getting this error for below method "The method compare(Student, Student) of type NameComparator must override or implement a super type method"
@Override
public int compare(Student s1, Student s2) {
String name1 = o1.getName();
String name2 = o2.getName();
// ascending order (descending order would be: name2.compareTo(name1))
return name1.compareTo(name2);
}
}
最佳答案
改变
public class NameComparator implements Comparator {
至
public class NameComparator implements Comparator<Student> {
当您实现原始 Comparator
接口(interface)(不建议这样做)时,您的 compare
方法需要 Object
参数。
关于java - 无法覆盖比较器的compare()方法,我们在Stack Overflow上找到一个类似的问题: https://stackoverflow.com/questions/28536915/