What makes Java platform independent?

With Java,

• When java compiler compiles any code, it generates the byte code, not the machine code.
• Now this byte code need a interpreter to execute on a machine.
• This interpreter is JVM (Java Virtual Machine).
• So JVM reads that byte code and executes it on the machine.
• Different JVM is designed for different OS and byte code is able to run on different OS.

Thus Java is designed such that it is executed on a JVM and not the machine itself, there by making it machine independent.

But if we consider C/C++,

• compiler generates the .exe file that is OS dependent.
• So when we run this .exe file on another OS it will not run because this file is OS dependent.
• So is not compatible with the another OS.
• Thereby C and C++ are machine dependent languages.