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The concept of using a segment of source code again and again in order to add new functions with minimal or no modifications is known as Reusability. By use of this concept, it localizes code modifications when a change in implementation is required and will eliminate bugs. A code reusability deals with two challenging issues i.e. i) deciding which part of the code to be retained same and ii) deciding which part of the code will be need to be designed from scratch.However, there are numerous approaches such as identifying and qualifying of reusable software components based on coupling, inheritance, external dependency, and polymorphism and reuse index of the component, through newly implemented tool DROOP which stands for Detection of Reusable components in Object Oriented Programming using Java NETBEANS & Java Swings, through multi-layer architecture, through frameworks, through Component Based Software Engineering(CBSE) and various other techniques. The main aim of this paper is to compare and analyze the various reusing techniques in order to find out the best one.