Worksheet 1-Library Class

1. Which of the following is a composite data type?

• a. int
• b. String
• c. char
• d. float

2. Which of the following is not a wrapper class?

• a. Byte
• b. Int
• c. Long
• d. Float

3. If s=“123”, which among the following will convert it to an int?

• a. int a=Integer(s);
• b. int a=(int)s;
• c. int a=parseInt(s);
• d. int a=Integer.parseInt(a);

4. What package is a part of the wrapper class which is imported by default into all Java programs?

• a. java.util
• b. java.lang
• c. java.awt
• d. None of these

5. What is, converting a primitive value into an object of the corresponding wrapper class called?

• a. Autoboxing
• b. Unboxing
• c. Type Casting
• d. All of these

6. Name the wrapper classes of char type.

7. Wrapper classes are not used to convert any data type into an object.

• True
• False

8. _______ is the process of converting one predefined datatype to another.

• type conversion
• Autoboxing
• Unboxing
• Widening

9. To convert a Primitive datatype into its Object, we make use of ________ Class.

• Scanner
• Wrapper
• System
• Type Conversion