Introduction to OOP

A primitive-type value is not an object, but it can be wrapped in an object using a wrapper class in the Java API.

• True

• False

You can construct a wrapper object either from a primitive data type value or from a string constructors representing the numeric value—for example, Double.valueOf(5.0), Double.valueOf(”5.0”), Integer.valueOf(5), and Integer.valueOf(”5”).

• True

• False

Integer x5 = 32,is same as Integer x5 = Integer.valueOf(32).

• True

• False

How do you convert an integer i into a string?

• String.valueOf(i);

• string(i)

• String()(i)

• String().i

Converting a primitive value to a wrapper object is called boxing. The reverse conversion is called unboxing.

• True

• False