我使用 Lambda 表达式将上百行的代码精简到几行

public class Student {    private String name;    private int age;    private double score;}public class Main {    public static void main(String[] args) {        List students = Arrays.asList(new Student("张三", 18, 89.5),                new Student("李四", 20, 60), new Student("王五", 19, 100), new Student("赵六", 22, 89));        // 过滤出年龄大于等于20的学生        List stus1 = filterStudentByAge(students);        System.out.println(stus1);        // 过滤出成绩大于80的学生        List stus2 = filterStudentByScore(students);        System.out.println(stus2);    }    // 过滤出年龄大于等于20的学生    private static List filterStudentByAge(List students) {        List stus = new ArrayList();        for (Student stu : students) {            if (stu.getAge() >= 20) {                stus.add(stu);            }        }        return stus;    }    // 过滤出成绩大于80的学生    private static List filterStudentByScore(List students) {        List stus = new ArrayList();        for (Student stu : students) {            if (stu.getScore() > 80) {                stus.add(stu);            }        }        return stus;    }}按上面的方式，如果要按另外一个条件过滤呢，又要写一个方法。那可以用策略模式处理，编写一个抽象策略接口，然后编写多个不同策略类实现它。// 策略接口public interface MyPredicate {    boolean test(T t);}// 过滤出年龄大于等于20的学生public class filterStudentByAge implements MyPredicate {    @Override    public boolean test(Student t) {        return t.getAge() >= 20;    }}// 过滤出成绩大于80的学生public class filterStudentByScore implements MyPredicate {    @Override    public boolean test(Student t) {        return t.getScore() > 80;    }}public class Main {    public static void main(String[] args) {        List students = Arrays.asList(new Student("张三", 18, 89.5),                new Student("李四", 20, 60)跟单网, new Student("王五", 19, 100), new Student("赵六", 22, 89));        // 过滤出年龄大于等于20的学生        List stus1 = filterStudent(students, new FilterStudentByAge());        System.out.println(stus1);        // 过滤出成绩大于80的学生        List stus2 = filterStudent(students, new FilterStudentByScore());        System.out.println(stus2);    }    // 按myPredicate策略过滤出满足条件的学生    private static List filterStudent(List students,            MyPredicate myPredicate) {        List stus = new ArrayList();        for (Student stu : students) {            if (myPredicate.test(stu)) {                stus.add(stu);            }        }        return stus;    }}