What is difference between C++ and Java?

Parameter	C++	Java
Relationship	No strict relationship between class names and filenames. In C++, header files and implementation files are used for specific class.	The strict relationship is enforced, e.g., the source code for class PayRoll has to be in PayRoll.java.
Input mechanism	I/O statements use in and cout, e.g., in » x; cout« y;	I/O input mechanism is a quite complex as it reads one byte at a time (System.in). Output is easy, e.g. System.out.println(x);
Complier and Interpreter	C++only support compiler	Java supports both compiler and interpreter
compatibility with other languages	Compatible with C source code, except some exceptional cases.	No backward compatibility with any previous language. The syntax is influenced by C/C++.
Access control and object protection	Flexible model with constant protection available	The cumbersome model encourages week encapsulation.
Concept	Write once compile anywhere	Write once run anywhere everywhere
Support for programming type	Allows both procedural programming and object-oriented programming.	Support object-oriented programming model.
Interface	Allows direct calls to native system libraries.	Only call through the Java Native Interface and recently Java Native Access
Memory management	Accessible to programmer	System controlled
Root hierarchy	C++ there is no such root hierarchy. C++ supports both procedural and object-oriented programming; therefore, it is called a hybrid language.	Java is a pure object-oriented Programming language. That's. Why It follows single root hierarchy.
Best features	C++ supports Object-oriented features Procedural programming features.	Java support automatic garbage collection. It does not support destructors as C++ does.
Goto Statement	C++ has a goto statement. Although, it is not ideal to a use a goto statement.	Java has no goto statement. The keywords got, and const are reserved even if they are not used.
Multiple inheritance	C++ provide multipleInheritance. The keywordvirtual is used to resolveproblems during multipleinheritance if there is any.	Java doesn't provide multiple inheritance.
Scope resolution operator	C++ has scope resolution operator (: :) which is used to define a method outside of a class and to access a global variable within from the scope where a local variable also exists with the same name.	No scope resolution operator (: :) in Java. The method definitions have to occur within a class, so there is no need for scope resolution.
Use of try and catch	In C++, you can't include the try/catch even if the function throws an exception.	In Java, Exception handling is different because there are no destructors. Also, in Java, try/catch must be defined if the function declares that it may throw an exception
Supporting method	C++ supports both method overloading & operator overloading	Java only supports method overloading. It does not provide support for operator overloading.
Portability	The source must be recompiled for the platform; hence the code is not portable.	Bytecode classes are transferrable to platform-specific JVM's.
Type semantics	Consistent between primitive and object types.	Differ for primitive and object types.
Libraries	Predominantly low-level functionality	Massive, classes for high-level services.
Runtime error detection	Programmer responsibility.	System Responsibility.
Supports	Points, structure, and union.	Threads and interfaces.
Functions & Data	Functions and data may exist external to any class, global and namespace scopes are available.	All function and data exist within classes; package scope are available.
Platform	C++ programs are platform dependent. They need to be compiled for a particular platform.	Java programs are platform independent. Java programs are written for Java Virtual Machine (JVM). It will run without needing recompilation.
Runtime error detection	In C++, It is Programmer responsibility to check the errors.	It is system responsibility to check error in the program.
Pointer	C++ support pointers.	Java offers only limited support for pointers.
Structure	It supports structures.	It does not any support for structures.
Unions	C++ supports unions.	Java does not support unions.
Object management	C++ supports manual object management with the help of new and delete keywords.	Java is heavy depend on automatic garbage collection. It does not support destructors.