迭代遍历
Set<String> set = new HashSet<String>();
Iterator<String> it = set.iterator();
while(it.hasNext()){
String str = it.next();
System.out.println(str);
}
for循环遍历
for(String str : set){
System.out.println(str);
}
优点还体现在泛型,假如set中存放的是Object
Set<Object> set = new HashSet<Object>();
for循环遍历:
for (Object obj: set) {
if(obj instanceof Integer){
int aa= (Integer)obj;
}else if(obj instanceof String){
String aa = (String)obj
}
........
}