例7-10.txt

这是一本java基础教程 对新手上路有很大帮助

import java.util.*; 
class Student{
    String name;
    int score;
    Student(String name,int score){
       this.name=name;
       this.score=score;
    }
}
public class Example7_10{
    public static void main(String args[]){
        Student zh=new Student("张红铭",77),
                 wa=new Student("王家家",68),
                 li=new Student("李佳佳",67);
        HashSet<Student> set=new HashSet<Student>();
        HashSet<Student> subset=new HashSet<Student>();
        set.add(zh); 
        set.add(wa);
        set.add(li);
        subset.add(wa);
        subset.add(li); 
        if(set.contains(wa)){
           System.out.println("集合set中含有:"+wa.name);
        }
        if(set.containsAll(subset)){
           System.out.println("集合set包含集合subset");
        }
        int number=subset.size();
        System.out.println("集合subset中有"+number+"个元素:");
        Object s[]=subset.toArray();
        for(int i=0;i<s.length;i++){
           System.out.printf("姓名:%s,分数:%d\n",((Student)s[i]).name,((Student)s[i]).score);
        }
        number=set.size();
        System.out.println("集合set中有"+number+"个元素:");
        Iterator<Student> iter=set.iterator();
        while(iter.hasNext()){
           Student te=iter.next();
           System.out.printf("姓名:%s,分数:%d\n",te.name,te.score);
        }
    }
}