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package test_28// 1. 创建表示学生信息的类并初始化学生对象列表
case class Student(name: String, age: Int, scores: List[Double])
object 迭代器1 {def main(args: Array[String]): Unit = {// 创建学生对象并存储在列表中val studentList = List(Student("小张", 18, List(88.0, 85.0, 90.0)),Student("小卢", 18, List(90.0, 97.0, 85.0)),Student("小王", 19, List(98.0, 80.0, 95.0)),Student("小朱", 21,  List(90.0, 85.0, 90.0)),Student("小沈", 19, List(88.0, 90.0, 90.0)))// 2. 创建迭代器并进行基础遍历val studentIterator = studentList.iteratorwhile (studentIterator.hasNext) {val student = studentIterator.next()println(s"学生姓名: ${student.name}")}// 3. 使用duplicate方法和筛选操作val (originalIterator, duplicateIterator) = studentList.iterator.duplicateval filteredByAge = originalIterator.filter(_.age > 20)val filteredByChineseScore = duplicateIterator.filter(student => student.scores(2) > 80)println("年龄大于20岁的同学:")filteredByAge.foreach(student => println(s"姓名: ${student.name}, 年龄: ${student.age}"))println("语文成绩大于80分的同学:")filteredByChineseScore.foreach(student => println(s"姓名: ${student.name}, 语文成绩: ${student.scores(2)}"))// 4. 使用zip方法关联信息val averageScoresList = studentList.map(student => student.scores.sum / student.scores.size)val averageScoresIterator = averageScoresList.iteratorval zippedIterator = studentList.iterator.zip(averageScoresIterator)println("学生姓名和平均成绩:")zippedIterator.foreach { case (student, averageScore) =>println(s"姓名: ${student.name}, 平均成绩: ${averageScore}")}// 5. 打印前三名的同学信息val topThreeStudents = studentList.sortBy(-_.scores.sum).take(3)println("前三名同学信息:")topThreeStudents.foreach(student => println(s"姓名: ${student.name}, 年龄: ${student.age}, 成绩总和: ${student.scores.sum}"))// 6. 打印从第4名开始的后3位同学的信息val fourthAndNextThreeStudents = studentList.sortBy(_.scores.sum).drop(3).take(3)println("从第4名开始的后3位同学信息:")fourthAndNextThreeStudents.foreach(student => println(s"姓名: ${student.name}, 年龄: ${student.age}, 成绩总和: ${student.scores.sum}"))// 7. 重新创建学生列表的迭代器，用于统计所有学生的所有成绩的总和，并打印结果val allScoresIterator = studentList.iteratorvar totalScore = 0.0while (allScoresIterator.hasNext) {val student = allScoresIterator.next()totalScore += student.scores.sum}println(s"所有学生的所有成绩总和: ${totalScore}")// 8. 再次使用该迭代器，筛选出成绩列表中有至少一个特定分数以上的学生信息，并打印他们的姓名和年龄val specificScore = 90.0val filteredStudents = studentList.iterator.filter(student => student.scores.exists(_ > specificScore))println(s"成绩中有至少一个${specificScore}分以上的学生信息:")filteredStudents.foreach(student => println(s"姓名: ${student.name}, 年龄: ${student.age}"))}
}