import java.util.ArrayList;public class demo2 {public static void main(String[] args) {ArrayList<Student> list = new ArrayList<>();list.add(new Student(1, "张亮", 98));list.add(new Student(2, "贾明明", 86));list.add(new Student(3, "贺晓光", 90));list.add(new Student(4, "甜甜", 89));list.add(new Student(5, "丽丽", 76));//成绩按降序排序list.sort((s1, s2) -> s2.getScore() - s1.getScore());//打印排序后的学生对象list.forEach(System.out::println);//删除前三之后的人for (int i = list.size() - 1; i >= 0; i--) {if (i > 2) {list.remove(i);}}System.out.println("=======删除前三之后的人所剩的========");list.forEach(System.out::println);}
}

public class Student {private int id;private String name;private int score;@Overridepublic String toString() {return "Student{" +"id=" + id +", name='" + name + '\'' +", score=" + score +'}';}public int getId() {return id;}public void setId(int id) {this.id = id;}public String getName() {return name;}public void setName(String name) {this.name = name;}public int getScore() {return score;}public void setScore(int score) {this.score = score;}public Student(int id, String name, int score) {this.id = id;this.name = name;this.score = score;}public Student() {}
}