阅读下列的程序import java.util.*;class Student { String name; String age; public Student(String name, String age) { this.name = name; this.age = age; } public String toString() { return name + ":" + age; }}public class Example{ public static void main(String[] args) { Set set = new HashSet(); set.add(new Student("Tom", "10")); set.add(new Student("Jerry", "10")); set.add(new Student("Tom", "10")); }}下列选项中,程序的运行结果是:set集合中的元素个数为( )
选项:
A:2
B:3
C:1
D:不固定个数
发布时间:2024-04-10 08:08:26