In this paper authors trying to studies that Java is not strictly object-oriented, even though it is commonly considered an object-oriented programming (OOP) language. Java contains primitive data types (char, double, int, etc.) that are not part of the object model, but a pure OOP language considers everything as an object. Java also departs from rigid OOP standards by supporting static methods and procedural programming. Features like operator overloading and real multiple inheritance are absent from Java in contrast to completely object-oriented languages like Smalltalk. Because of these drawbacks, Java is not strictly object-oriented but rather categorized as a hybrid language. These features will be thoroughly examined in this paper, along with the reasons why Java does not entirely adhere to the rules of pure objectoriented programming.