Question

Explain the importance of wrapper classes in computer java language??​

Answer 1

Answer:

Wrapper class-

As the name suggests, wrapper classes wraps the datatype and gives it an object

appearance.

It can be compared with a chocolate. The manufacturer wraps the chocolate with some foil or paper to prevent from pollution. The user takes the chocolate, removes and throws the wrapper and eats it.

Explanation:

Importance of wrapper classes-

1) To convert simple data types into objects, that is, to give object form to a data type; here constructors are used.

2) To convert strings into data types (known as parsing operations), here methods of type parseXXX() are used.

Example-

Observe the following conversion.

int k = 100;

Integer it1 = new Integer(k);

The int data type k is converted into an object, it1 using Integer class. The it1 object can be used in Java programming wherever k is required an object.

The following code can be used to unwrap (getting back int from Integer object) the object it1.

int m = it1.intValue();

System.out.println(m*m); // prints 10000

intValue() is a method of Integer class that returns an int data type.

Answer 2

Wrapper class is a special class in Java.

Hli