1.Set、List的遍历
public class mySet {
public static void main(String[] args) {
Set set=new HashSet();
set.add(new student("小花",27));
set.add(new student("小刚",25));
set.add(new student("小民",24));
set.add(new student("小明",23));
Iterator iter=set.iterator();
String str;
while(iter.hasNext()){
str=((student)iter.next()).name;
System.out.println(str);
}
// System.out.println(set.size());
}
}
class student1{
String name;
int id;
public student1(String name, int id) {
super();
this.name = name;
this.id = id;
}
}
2.Map的遍历
Set set = map.keySet();
Iterator iter = set.iterator();
while(iter.hasNext()){
System.out.println(((student)iter.next()).name);//打印出map中的键(1,2,3)
}