求集合中元素属性的最值

求集合中元素属性的最值 方法一

 ArrayList studentArrayList = new ArrayList<>();
        studentArrayList.add(new Student("zhangsan",12,98,"优等生"));
        studentArrayList.add(new Student("lisi",13,75,"还不错"));
        studentArrayList.add(new Student("wangwu",14,58,"别上了"));
        studentArrayList.add(new Student("zaoliu",15,60,"就那样"));
        studentArrayList.add(new Student("tianqi",15,89,"还不错"));
        System.out.println(studentArrayList.stream().map(Student::getScore).max((x1, x2) ->x1.compareTo(x2)).get());
        System.out.println(studentArrayList.stream().map(Student::getScore).min((x1, x2) -> x1.compareTo(x2)).get());

方法二

在这里插入代码片ArrayList studentArrayList = new ArrayList<>();
        studentArrayList.add(new Student("zhangsan",12,98,"优等生"));
        studentArrayList.add(new Student("lisi",13,75,"还不错"));
        studentArrayList.add(new Student("wangwu",14,58,"别上了"));
        studentArrayList.add(new Student("zaoliu",15,60,"就那样"));
        studentArrayList.add(new Student("tianqi",15,89,"还不错"));
        Student max=studentArrayList.get(0);
        for (Student student : studentArrayList) {
            if (student.getScore()>max.getScore()){
                int score = student.getScore();
                max.setScore(score);
            }
        }
        System.out.println(max.getScore());