What is difference between aggregation and composition in Java?

Object composition refers to the logical or conceptual structure of the information , not the implementation or physical data structure used to represent it. For example, a sequence differs from a set because (among other things) the order of the composed items matters for the former but not the latter.

The definition of composition is the act of putting something together, or the combination of elements or qualities. An example of a composition is a flower arrangement . An example of a composition is a manuscript. An example of a composition is how the flowers and vase are arranged in Van Gogh’s painting Sunflowers.

Benefits of using Composition: Composition allows us to reuse the code . In Java, we can use multiple Inheritance by using the composition concept. The Composition provides better test-ability of a class. Composition allows us to easily replace the composed class implementation with a better and improved version.

Aggregation implies a relationship where the child can exist independently of the parent . For example, Bank and Employee, delete the Bank and the Employee still exist. whereas Composition implies a relationship where the child cannot exist independent of the parent.

Benefits of using Composition: Composition allows us to reuse the code . In Java, we can use multiple Inheritance by using the composition concept. The Composition provides better test-ability of a class. Composition allows us to easily replace the composed class implementation with a better and improved version.