What is wrapper class ? Primitives are int, short, long, boolean, etc. OR Use of wrapper class in java? 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 in java servers two primary purposes. As we know Java is not a pure object-oriented programming language, because there are 8 primitive data types. Let's expand upon the previous example of the Integer and use one of the methods to convert it to a Double. An object of type Integer contains a single field whose type is int. Custom Wrapper class in Java? Need for wrapper classes in Java Java provides primitive datatypes (char, byte, short, int, long, float, double, boolean) and, reference types to store values. 3. When we create the object to the wrapper class, it contains the field, and in this field, we can store primitive data types. 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. Why do we need wrapper classes in java? Autoboxing and unboxing in java? Wrapper class in java with example? So, in short, Wrapper Classes are used to convert primitive data types into objects and vice versa. The wrapper class for the int data type is the Integer class. The Integer class wraps a value of the primitive type int in an object. To support this, java provides wrapper classes to move primitives to objects. 4. Some of the wrapper classes … Java Wrapper class is an inbuilt class whose object wraps or contains primitive data types. A need was felt to convert these Primitive Data Types into Classes and Objects, thus Java introduced a concept known as Wrapper Classes. Wrapper classes are the set of classes located in java.lang package which are used to convert the primitive data types to object types. 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. 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? 2. In this Java Tutorial, learn about Java wrapper classes, their usage, conversion between primitives and objects; and autoboxing and unboxing with examples.. 1. Wrapper class in java. 5. Everything in java is an object, except primitives. 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