The Composite Design pattern is structural design pattern. This design pattern is used when we want to treat a group of objects in same way. The composite design pattern has following elements. Component This is a class that contain all the members that needs to be implemented by all the objects. Composite This class is used to add, remove and traverse components. Leaf The leaf object in tree structure is defined as leaf element. Code Sample I want to print salaries of all employees in my organization with names and designation. The root of organization tree is CEO. The CEO has directors as child composite.