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Primitive Data Type Wrapper Class
long Long
float Float
double Double
boolean Boolean
char Character
Program 4 Write a program to demonstrate the use of wrapper classes in Java.
1 class wrapper_class
2 {
3 public static void main(String[] args)
4 {
5 Integer int_var = 100;
6 Double double_var = 125.95;
7 Character char_var = 'a';
8 Float float_var = 34.56f;
9 System.out.println("Integer Variable: " +int_var);
10 System.out.println("Double Variable: " +double_var);
11 System.out.println("Character Variable: " +char_var);
12 System.out.println("Float Variable: " +float_var);
13 }
14 }
The output of the preceding program is as follows:
BlueJ: Terminal Window - Java
Options
Integer Variable: 100
Double Variable: 125.95
Character Variable: a
Float Variable: 34.56
6.7 CLASS AS TYPE OF THE OBJECT
In Java, when an object of a class is created, it contains all the data members defined in that class. These data members
may include both primitive data types and objects. The instance of a class is known as an object and the size of the
object is equal to the total size of all its data members. Therefore, a class defines the structure and size of its objects
and thus a class can be considered as the type of the object.
144 Touchpad Computer Science (Ver. 3.0)-XI
