Which of the following are wrapper classes?
Select the three correct answers.
java.lang.Void
java.lang.Int
java.lang.Boolean
java.lang.Long
java.lang.String
Which of the following classes do not extend the java.lang.Number class?
Select the two correct answers.
java.lang.Float
java.lang.Byte
java.lang.Character
java.lang.Short
Which of these classes define immutable objects?
Character
Byte
Thread
Short
Object
Which of these classes have a one-parameter constructor taking a string?
Void
Integer
Boolean
Which of the wrapper classes have a booleanValue() method?
Select the one correct answer.
All wrapper classes.
All wrapper classes except Void .
All wrapper classes that also implement the compareTo() method.
All wrapper classes extending Number .
Only the class Boolean .
Which statements are true about wrapper classes?
String is a wrapper class.
Double has a compareTo() method.
Character has a intValue() method.
Byte extends Number .