Object[] ob = {"hello","World"};

String[] str = (String[]) ob;

//報異常Exception in thread "main" java.lang.ClassCastException: [Ljava.lang.Object; cannot be cast to [Ljava.lang.String]

原因是Object[] 陣列不能強轉成String[]陣列;

Object[] object = {"ss","sssss"};
	System.out.println(object.getClass());
//輸出結果：class [Ljava.lang.Object;
for(Object o : s) {
	System.out.println(o.getClass());
}
//輸出結果：class java.lang.String
Object[] object = new String[10];
System.out.println(object.getClass());
//輸出是：class [Ljava.lang.String;