展開全部

package com.tx.collection;

import java.util.Comparator;

import java.util.Iterator;

import java.util.Map;

import java.util.Set;

import java.util.TreeMap;

import java.util.TreeSet;

import java.util.Vector;

public class Student {

String name;

int score;

public Student(String n, int s) {

name = n;

score = s;

}

public boolean equals(Object o) {

Student other = (Student) o;

return other.score == score;

}

public String toString() {

return name + "," + score;

}

public static void main(String[] args) {

Vector stu = new Vector();

stu.add(new Student("張三", 90));

stu.add(new Student("李四", 80));

stu.add(new Student("小明32313133353236313431303231363533e58685e5aeb931333363386231", 85));

stu.add(new Student("王五", 60));

stu.add(new Student("何六", 70));

Student index = new Student("", 60);

int t = stu.indexOf(index);

System.out.println("成績為60的學生姓名為" + stu.elementAt(t).name);

Set set = new TreeSet(new Comparator() {

@Override

public int compare(Student o1, Student o2) {

if (o1.score > o2.score)

return -1;

else if (o1.score < o2.score)

return 1;

else

return 0;

}

});

set.addAll(stu);

Iterator iterator = set.iterator();

while(iterator.hasNext()){

Student s = iterator.next();

System.out.println(s.name+":"+s.score);

}

}

}