Wrapper classes in Java:
In Java, wrapper classes are a set of classes that provide a way to use primitive data types as objects. Since primitive data types are not objects in Java, they cannot be used directly in many situations where objects are required. For example, you cannot add two int values together using the + operator if they are not wrapped in an object.
Wrapper classes provide a solution to this problem by allowing primitive data types to be used as objects. There are eight wrapper classes in Java, one for each primitive data type:
Wrapper classes provide many useful methods for working with primitive data types as objects. For example, you can use the valueOf() method to create a new object from a primitive data type:
int num = 42;
Integer obj = Integer.valueOf(num);
You can also use the wrapper classes to convert between primitive data types and their corresponding object types. For example, you can use the intValue() method to convert an Integer object to an int value:
Integer obj = Integer.valueOf(42);
int num = obj.intValue();
Wrapper classes also provide constants for each type’s maximum and minimum values, as well as methods for parsing and formatting strings as their respective types.
In summary, wrapper classes in Java provide a way to use primitive data types as objects, which is necessary in many situations where objects are required. They provide useful methods for working with primitive data types as objects, converting between types, and formatting and parsing strings.
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