在诸如Java盒装数字基元类型的番石榴等实用程序库中是否有类似.isNullOrZero()的东西?
A Integer, Long can not be empty if it is not null
; it can be zero in this case. So for Integer or Long you can write something like this -
public static boolean isNullOrZero( final Object obj) {
if(null == obj) return true;
if( obj instanceof Integer ){
Integer i = (Integer) obj;
return (i == 0);
}
if( obj instanceof Long ){
Long l = (Long) obj;
return (l == 0);
}
}
For Collection, if it is not null then it can be empty. Then you can write your own isNullOrEmpty()
method like this -
public static boolean isNullOrEmpty( final Collection< ? > collection ) {
return (collection == null || collection.isEmpty() );
}
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