In addition, this class provides several methods for converting an int to a String and a String to an int, as well as other constants and methods useful when dealing with an int. Need for wrapper classes in Java Java provides primitive datatypes (char, byte, short, int, long, float, double, boolean) and, reference types to store values. Let's expand upon the previous example of the Integer and use one of the methods to convert it to a Double. The Integer class wraps a value of the primitive type int in an object. Let’s have a quick look with some Java code example on Wrapper classes // Converting primitive types to Wrapper classes Example int i = 12; Integer intWrapper = new Integer(i); float f = 512.32f; Float floatWrapper = new Float(f); char c = 's'; Character charWrapper = new Character(c); The wrapper classes are part of the java.lang package, which is imported by default into all Java programs. This article covers wrapper class in java with the equivalent wrapper class objects of the primitive data types with autoboxing and unboxing examples. Wrapper class in java with example? When we create the object to the wrapper class, it contains the field, and in this field, we can store primitive data types. 3. 4. The wrapper class for the int data type is the Integer class. An object of type Integer contains a single field whose type is int. Some of the wrapper classes … Why do we need wrapper classes in java? Autoboxing and unboxing in java? Java Wrapper Classes. To support this, java provides wrapper classes to move primitives to objects. 5. Everything in java is an object, except primitives. So, in short, Wrapper Classes are used to convert primitive data types into objects and vice versa. Java Wrapper Classes Tutorial with Examples October 30, 2015 admin This tutorial explains the concepts of Java wrapper classes with examples, shows how to convert from wrapper types to primitives and vice-a-versa, explains numeric wrapper classes and wraps up with character & boolean wrapper classes Character . A need was felt to convert these Primitive Data Types into Classes and Objects, thus Java introduced a concept known as Wrapper Classes. Custom Wrapper class in Java? Whenever we pass primitive datatypes to a method the value of those will be passed instead of the reference therefore you cannot modify the arguments we pass to the methods. Wrapper classes are the set of classes located in java.lang package which are used to convert the primitive data types to object types. Since they are not objects, they cannot return as objects, and collection of objects. What is wrapper class ? 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