Question

what is a wrapper class????!​

Answer 1

Answer:

Explanation:

A Wrapper class is a class whose object wraps or contains a primitive data types.

Answer 2

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$wrapper \: class$

Wrapper class are the part of java.lang library which converts the primitive data types into objects.

Here are some of the primitive data type with its wrapper class:-

$data \: type \: \: \: \: \: \: \: \: wrapper \: class$

1. int Integer
2. char. Character
3. short Short
4. boolean Boolean
5. long Long
6. float. Float
7. double. Double
8. byte. Byte

Example:

Integer I=new Integer(6);

Character c=new Character (f);

Significance use of Wrapping classes:-

• Wrapping class can store more data than primitive data type.
• NOTE: IF WE WANT TO USE MULTIPLE OBJECTS,THAN WE CAN USE THE WRAPPER CLASS.
• To retrieve data in any kind of data structures that support object.
• Wrapper class has function to perform parsing operation so it became very use full for us.
• Wrapper class object allows us to store null values.

Some common method:-

1. The valueOf()Method
2. The xxxValue()Method
3. The parseXxx()Method
4. The toString()Method