Page 151 - Computer science 868 Class 12
P. 151
public static void main()
{
int a, b=0;
a = 2;
Integer c = new Integer(a);
b = a;
System.out.println("Autoboxing = "+c);
System.out.println("Unboxing = "+b);
}
}
Output:
Autoboxing: 2
Unboxing: 2
Let’s Revisit
♦ The different combinations of the characters are used to declare variables, keywords and symbols which are required to
write a whole program. These are known as Character Sets of Java.
♦ Any meaningful statement containing identifiers, literals and arithmetical operators that produces a result is called an
Arithmetical Expression and when the expression is assigned to a variable, then it is called an Arithmetical Statement.
♦ There are two types of conversions in Java:
* Implicit Conversion that is done automatically
* Explicit Conversion that is done by force
♦ Wrapper classes are used to convert primitive data values into objects and objects to primitive data types.
♦ Autoboxing is a method of converting a primitive value into an object of the corresponding wrapper class.
♦ Unboxing is a method of changing an object of a wrapper class into its corresponding primitive value.
MIND DRILL
Solved Questions
A. Tick ( ) the correct option:
1. Alphabets are a type of ………………… .
a. Unicode Character Set b. Java Syntax
c. Both a and b d. None of these
2. The long data type is a 64-bit integer or equivalent to ………………… .
a. 1-bit b. 4-bits
c. 32-bits d. 8 bytes
3. Non-primitive data types are also called ………………… .
a. Reference data types b. Composite data types
c. Both a and b d. None of these
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Primitive Values, Wrapper Classes, Types and Casting 149

