请把学生名与考试分数录入到Map中，并按分数显示前三名成绩学员的名字。

@Test public void test2() { Comparator com = new Comparator() { public int compare(Object o1, Object o2) { if (o1 instanceof Student && o2 instanceof Student) { Student s1 = (Student) o1; Student s2 = (Student) o2; if (s1.getScore() != s2.getScore()) { return s1.getScore() - s2.getScore(); }else{ return s1.getId()-s2.getId(); } } return 0; } }; Map map = new TreeMap(com); map.put(new Student(001, 87), "吴将1"); map.put(new Student(002, 87), "吴将2"); map.put(new Student(004, 96), "吴将3"); map.put(new Student(003, 75), "吴将4"); Set entry = map.entrySet(); List list=new ArrayList(entry); Collections.reverse(list); for(int i=0;i<3;i++){ System.out.println(list.get(i)); } } }

接上面，学生类

public class Student { private int id; private int score; public Student() { super(); } public Student(int id, int score) { super(); this.id = id; this.score = score; } public int getId() { return id; } public void setId(int id) { this.id = id; } public int getScore() { return score; } public void setScore(int score) { this.score = score; } @Override public String toString() { return "Student [id=" + id + ", score=" + score + "]"; } @Override public int hashCode() { final int prime = 31; int result = 1; result = prime * result + id; result = prime * result + score; return result; } @Override public boolean equals(Object obj) { if (this == obj) return true; if (obj == null) return false; if (getClass() != obj.getClass()) return false; Student other = (Student) obj; if (id != other.id) return false; if (score != other.score) return false; return true; } }