作为HashMap值的java打印数组列表
我有一个包含主题列表的HashMap。每个学生都有不同的笔记。如何从HashMap打印这些注释?在我的代码末尾,我有println
,如果我想打印某个主题的每个平均值,我该怎么做
Student student1 = new Apprentice("Jack", "Morgan");
Subject english = new Subject("English", Arrays.asList(2, 3, 2, 2));
Subject japanese = new Subject("japanese", Arrays.asList(2, 2, 2, 4));
HashMap<Student, List<Subject>> studentGrade = new HashMap<>();
studentGrade.put(student1, Arrays.asList(english, japanese));
for (Map.Entry<Apprentice, List<Subject> > entry : apprenticeGrades.entrySet()) {
System.out.println("Student " + entry.getKey());
for (Subject subject : entry.getValue()) {
System.out.println("Average from subject:" + subject.getAvg());
}
# 1 楼答案
首先将所有主题(值)放在一个列表中,然后迭代计算并打印平均值