Computer programming is the core of computer science, and the most popular and commonly used languages in Computer programming are C++ and Java. With the recent rise of the software sector, more people are becoming curious to enhance their skills by learning programming languages. However, while there are over 500 programming languages accessible today, only a few of them are extensively used. Some of the security concerns of these two programming languages were summed up and compared. According to the security concerns and the results of the experiment, the research mentioned the important security concerns in these two of the most popular programming languages. For performance-critical applications that require speed and effective memory management, C++ is a popular language. It's employed in a variety of fields such as software and game development, virtual reality, robotics, and scientific computing. Java is a programming language that may be used to create apps for a variety of platforms. Java is used on desktops, servers, mobile phones, tablets, Blu-ray players, televisions, and web browsers, and Java-based applications can be written for any of these platforms. For embedded device programming, we use C++. In other words, C++ almost always employs a one-time programming code.Java, on the other hand, is not intended for one-time programming. Java is used in applications that can be further developed or upgraded based on the needs and requirements.