「Java」コレクションSetのメモ

1.Set<String>のコード
Set<String> set = new HashSet<String>();
Iterator<String> it = set.iterator();
while (it.hasNext()) {
String str = it.next();
System.out.println(str);
}

2.forループのコード
for (String str : set) {
System.out.println(str);
}

3.Set<Object>のコード
Set<Object> set = new HashSet<Object>();
for (Object obj: set) {
if(obj instanceof Integer){
int aa= (Integer)obj;
}else if(obj instanceof String){
String aa = (String)obj
}
//some code
}

Java

Posted by arkgame