Wrapper class : The wrapper classes allow accessing primitive data types as objects.

Wrapper classes provide java code makes fully object-oriented. A wrapper class is used similarly as unions, structures, or algebraic types for any other class; the method is limited with a bounded introspection and with possible dynamism in Apex. Since J2SE 5.0, autoboxing and unboxing feature convert primitives into objects and objects into primitives automatically.The automatic conversion of primitive into an object is known as autoboxing and vice-versa unboxing. One advantage of Java is that it supports Object Oriented Programming (OOP).Using OOP, the program or the software can be modeled using objects.

For example you may want to define a type that will conatin some account data+some images+some other custom object data. Java is a popular programming language that is used to develop various applications. Purpose. The difference to wrapper methods is that an intrinsic model building metric is used during learning. The wrapper classes are part of the packages like (java.lang package). Wrapper class in simple words is a custom defined type by programmer, whose structure will be defined as required by programmer. A "wrapper class" is a de facto term meaning a class that "wraps around" a resource; i.e, that manages the resource. The third class, embedded methods, are quite similar to wrapper methods since they are also used to optimize the objective function or performance of a learning algorithm or model.

We know that a location in apex can store only data of one type and when you have data from multiple types then you wont be club them together without a self defined container called as wrapper class. When people write a wrapper, then, they are doing something like this: In other words, it is a collection of data members only without methods or user-defined data types. Programming convenience. Example: Suppose that we have a List of Mobile phones like the iPhone or Nokia.Now we want to store the characteristics of each Mobile like display size, color, etc. Sometimes the first bit of HTML we write in a new document is an element that wraps everything else on the page. A Wrapper class is a class which contains the primitive data types (int, char, short, byte, etc).In other words, wrapper classes provide a way to use primitive data types (int, char, short, byte, etc) as objects.These wrapper classes come under java.util package.. Why we need Wrapper Class. A wrapper class doesn’t have an inner class determined by default, yet the practice of having an inner class can be more efficient and simple in Salesforce. A class is used as a blueprint to create an object.In programming, it is necessary to … A wrapper or container class is a class, a data structure, or an abstract data type whose instances are collections of other objects. Wrapper Class is a class within a class that stores a group of different or similar data type values into a single object.. We give it a class, and that class is responsible for encapsulating all visual elements on the page. The wrapper class in Java provides the mechanism to convert primitive into object and object into primitive..