Security Manager: It determines what resources a class can access such as reading and writing to the local disk.Bytecode Verifier: It checks the code fragments for illegal code that can violate access rights to objects.
It adds security by separating the package for the classes of the local file system from those that are imported from network sources.
Classloader: Classloader in Java is a part of the Java Runtime Environment (JRE) which is used to load Java classes into the Java Virtual Machine dynamically. Java Programs run inside a virtual machine sandbox. With Java, we can develop virus-free systems. This bytecode is a platform-independent code because it can be run on multiple platforms, i.e., Write Once and Run Anywhere (WORA). Java code is compiled by the compiler and converted into bytecode. Java code can be executed on multiple platforms, for example, Windows, Linux, Sun Solaris, Mac/OS, etc. The Java platform differs from most other platforms in the sense that it is a software-based platform that runs on top of other hardware-based platforms. There are two types of platforms software-based and hardware-based. A platform is the hardware or software environment in which a program runs. which are compiled into platform specific machines while Java is a write once, run anywhere language. 
Java is platform independent because it is different from other languages like C, C++, etc. Object-oriented programming (OOPs) is a methodology that simplifies software development and maintenance by providing some rules. Object-oriented means we organize our software as a combination of different types of objects that incorporate both data and behavior. Java is an object-oriented programming language.
There is no need to remove unreferenced objects because there is an Automatic Garbage Collection in Java. Java has removed many complicated and rarely-used features, for example, explicit pointers, operator overloading, etc. Java syntax is based on C++ (so easier for programmers to learn it after C++). 
According to Sun Microsystem, Java language is a simple programming language because: Java is very easy to learn, and its syntax is simple, clean and easy to understand.
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