Which of the following is/are not valid wrapper classes?

1. Integer
2. Float
3. integer
4. character
5. Character

The Wrapper class objects' value is comparable to primitive type values. True/false ?

Which of the following statements are true ?

1. The Integer class has a String- and an int-constructor.
2. The Integer has a floatValue( ) method.
3. The wrapper classes are contained in the java.lang.Math package.
4. The Double class has constructors for type double and float.

What is the output of this program?

class Output {
    public static void main(String args[])
    {
        Integer i = new Integer(257); 
        byte x = i.byteValue(); 
        System.out.print(x);
    }
}

1. 0
2. 1
3. 256
4. 257