wrapper typeの例文

• The wrapper type Void is often used when a unit type parameter is needed.
• So unless the variable that is assigned to has type boolean ( or wrapper type Boolean ), there will be a compile error.
• Java does not support type lifting as a concept, but all of the built-in primitive types have corresponding wrapper types, which do support the null value by virtue of being reference types ( classes ).
• Series 1 had problems on faster processors of the Amiga, and games were getting bigger, very few loaded everything in one hit anymore, so early Series 1 was now dead and so was the wrapper type Series 1.
• According to the Java spec, any attempt to dereference the null reference must result in an exception being thrown at run-time, specifically a NullPointerException . ( It would not make sense to dereference it otherwise, because, by definition, it points to no object in memory . ) This also applies when attempting to unbox a variable of a wrapper type, which evaluates to null : the program will throw an exception, because there is no object to be unboxed-and thus no boxed value to take part in the subsequent computation.