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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 +
'}';
}
}
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());
}
}
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);
}
}
}
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);
}
}
}
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);
}
}
}
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。
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