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Vu Luong Anh Pundit
Asked At: 1627529082000 In: Java
Vu Luong Anh Pundit Asked At: 1627529082000 In: Java
Khi nào thì dùng annotation @SuppressWarnings({"unchecked", "rawtypes"})
Cho em hỏi chức năng của annotation @SuppressWarnings({"unchecked", "rawtypes"}), và khi nào thì mình nên dùng nó ạ?
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tvd12 Enlightened
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  1. unchecked: sử dụng trong trường hợp em cast mà không sử dụng instanceof
Ví dụ:
Object obj = new String("abc");
String str = (String)obj; thì khả năng cao em sẽ bị cảnh báo còn nếu em check:
if(obj instanceof String) {
String str = (String)obj;
}
thì ok
  1. rawtypes: sử dụng trong trường hợp em không chỉ định rõ generic type cho lớp em dùng
Ví dụ: List list = new ArrayList() thì em sẽ bị IDE cảnh báo còn nếu em dùng List list = new ArrayList() thì không sao
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