|
马上注册,结交更多好友,享用更多功能^_^
您需要 登录 才可以下载或查看,没有账号?立即注册
x
4.请设计教师类Teacher、比较器类MyComparer。教师有姓名、工资属性以及相应的getter和setter方法,并重写toString方法。比较器类有两个方法,一个是静态方法compareBySalory(Teacher t1, Teacher t2),要求按升序排序;一个是实例方法compareBySaloryDesc(Teacher t1, Teacher t2),要求按降序排序。请编写应用程序分别使用匿名内部类、lambda表达式以及方法引用对若干教师按照工资高低进行排序。
这是一个关于Java编程的问题,需要设计教师类和比较器类,并使用匿名内部类、lambda表达式和方法引用对教师按照工资高低进行排序。
以下是代码示例:
教师类Teacher:
- public class Teacher {
- private String name;
- private double salary;
- public Teacher(String name, double salary) {
- this.name = name;
- this.salary = salary;
- }
- public String getName() {
- return name;
- }
- public double getSalary() {
- return salary;
- }
- public void setName(String name) {
- this.name = name;
- }
- public void setSalary(double salary) {
- this.salary = salary;
- }
- @Override
- public String toString() {
- return "Teacher{" +
- "name='" + name + '\'' +
- ", salary=" + salary +
- '}';
- }
- }
复制代码
比较器类MyComparer:
- import java.util.Comparator;
- public class MyComparer {
- public static int compareBySalory(Teacher t1, Teacher t2) {
- return Double.compare(t1.getSalary(), t2.getSalary());
- }
- public int compareBySaloryDesc(Teacher t1, Teacher t2) {
- return Double.compare(t2.getSalary(), t1.getSalary());
- }
- }
复制代码
使用匿名内部类对教师按照工资高低进行排序:
- import java.util.Arrays;
- import java.util.Comparator;
- public class Main {
- public static void main(String[] args) {
- Teacher[] teachers = {
- new Teacher("Tom", 5000),
- new Teacher("Jerry", 6000),
- new Teacher("Mickey", 4000)
- };
- // 使用匿名内部类按照工资升序排序
- Arrays.sort(teachers, new Comparator<Teacher>() {
- @Override
- public int compare(Teacher t1, Teacher t2) {
- return Double.compare(t1.getSalary(), t2.getSalary());
- }
- });
- // 输出排序结果
- for (Teacher teacher : teachers) {
- System.out.println(teacher);
- }
- }
- }
复制代码
使用lambda表达式对教师按照工资高低进行排序:
- import java.util.Arrays;
- public class Main {
- public static void main(String[] args) {
- Teacher[] teachers = {
- new Teacher("Tom", 5000),
- new Teacher("Jerry", 6000),
- new Teacher("Mickey", 4000)
- };
- // 使用lambda表达式按照工资降序排序
- Arrays.sort(teachers, (t1, t2) -> Double.compare(t2.getSalary(), t1.getSalary()));
- // 输出排序结果
- for (Teacher teacher : teachers) {
- System.out.println(teacher);
- }
- }
- }
复制代码
使用方法引用对教师按照工资高低进行排序:
- import java.util.Arrays;
- public class Main {
- public static void main(String[] args) {
- Teacher[] teachers = {
- new Teacher("Tom", 5000),
- new Teacher("Jerry", 6000),
- new Teacher("Mickey", 4000)
- };
- // 使用方法引用按照工资升序排序
- Arrays.sort(teachers, Comparator.comparingDouble(Teacher::getSalary));
- // 输出排序结果
- for (Teacher teacher : teachers) {
- System.out.println(teacher);
- }
- }
- }
复制代码
以上就是Java编程的解决方案,其中包括了教师类和比较器类的设计,以及使用匿名内部类、lambda表达式和方法引用对教师按照工资高低进行排序的示例代码。
|
|