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Wrapper class in Java

by anupmaurya
18 minutes read

In this article, you’ll learn about Wrapper class in Java, autoboxing, Unboxing, Features of Wrapper class and more

  • Wrapper classes allow primitive data types to be accessed as objects and objects as a primitive data types.
  • The various wrapper classes for primitive data type are: Boolean, Byte, Character, Double, Float, Integer, Long and Short.
  • Wrapper classes make the primitive type data to act as objects.


Autoboxing is the process of converting a primitive data type into corresponding wrapper class object. E.g. int to Integer.

Example: Sample program for autoboxing

class AutoBoxDemo
    public static void main(String args[])
        int x = 50;
        Integer y = Integer.valueOf(x);
        Integer z = x + y;
       System.out.println(x+"  "+y+"  "+z);


50  50  100


Converting an object of wrapper class into corresponding primitive data type is known as unboxing. For example Integer to int.

Example: Sample program for unboxing

class UnBoxDemo
    public static void main(String args[])
        Integer x = new Integer(15);
        int y = x.intValue();
        int z = x * y;
        System.out.println(x+"  "+y+"  "+z);


15  15  225

Primitive type and their corresponding wrapper class

Primitive typeWrapper class

Features of Wrapper class

  • Wrapper classes convert numeric strings into numeric values.
  • They provide a way to store primitive data into the object.
  • The valueOf() method is available in all wrapper classes except Character.
  • All wrapper classes have typeValue() method. This method returns the value of the object as its primitive type.

Character class method

  • isDigit(): to determine whether the character is digit.
  • isLower(): to determine whether the character is lower case alphabet.
  • isLetter(): to determine whether the character is an alphabet.

Byte class method

  • byteValue(): returns the Byte value as byte value.
  • parseByte(): returns byte value from a byte string.

Integer class method

  • intValue(): returns the Integer value as int value.
  • parseInt(): returns the int value from a int string.

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