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