What is difference between C++ and Java?

Both Java and C++ support object oriented programming, yet there are differences between them. To begin with, Java is a pure object oriented programming language; therefore, everything is an object in Java (single root hierarchy as everything gets derived from java.lang.Object). On the contrary, in C++ there is no such root hierarchy. C++ supports both procedural and object oriented programming; therefore, it is called a hybrid language. read less

There are many differences between C++ and Java.But which are the key difference are enlisted. 1.C++ is more a procedure oriented Language which supports some OOP concept , whereas Java is purely Object Oriented. 2.C++ is not Portable, while Java is portable. (Java produces intermediate code called Java Byte Code which is machine Independent (So it is Portable), By using a JVM (Java Virtual Machine) which can convert it to machine dependent Code). These are the main difference, others are enlisted in other replies. read less

There are number of difference between java and C++ + less memory models Java allocates all its objects on the heap (all managed by the garbage collector); C++ additionally offers stack based instantiation (including temporary objects), and static instantiation. Stack objects are automatically deleted (when they go out of scope), so a programmer has to assure no references are kept further (e.g. in a container, registry, etc.). Instantiation order with static instantiation is difficult to predict, and therefore error-prone, less portable, and restricted. + no temporary objects [Based on non-trivial rules] C++ language will chose either a cast or temporary object (including object construction) to [implicitly] coerce one type into another, sometimes leading to unwanted effects or unwanted overhead. + no copy constructor and assignment operator needed Due to Java's memory model, no copy constructor and assignment operator are needed, and therefore can't become a source of bugs. + no explicit cast code supported C++ increases the number of routes for type coercion by allowing to defined explicit cast code. + no ambiguity between int, boolean, and null pointer Due to false and null both being distinct from 0 there's no ambiguity if used e.g. as parameters in overloaded methods3. + no default parameters As not supported, there can't be an ambiguity between methods with default parameters and other overloaded methods. + no unsigned integers As unsigned integers don't really buy anything (in C/C++ neither, decent casts can be used), they're omitted. ~ const not supported Object immutability is in Java at most considered via annotation4. The more intuitive final modifier allows to implement first-level constness on variables and fields (again being more intuitive than C++'s reference fields). ~ expression evaluation order Evaluation order within expression is stricter defined in Java, leading to more deterministic behavior, and avoiding a specific source of problems. C++ compiler however may allow options to warn about undefined semantics outside of sequence points. ~ no macro pitfalls Macros offer call-by-name semantics and therefore allow unwanted side effects, e.g. with multiple evaluation (max(i++,j++)), or precedence issues (with missing parentheses).5 read less

Java is pure object oriented programming language. C++ is not pure object oriented programming language. Java Runs in a virtual machine. C++ Runs as native executable machine code for the target instruction set. Java does not support Pointers, references. C++ Supports Pointers, references. Java memory management done using automatic garbage collection. C++ Memory management can be done manually through new / delete. Java supports Single inheritance of classes. Supports multiple inheritance via the Interfaces construct, which is equivalent to a C++ class composed of abstract methods. C++ supports Single and Multiple inheritance of classes, including virtual inheritance. read less

Both are object oreinted programming languages, but java is said to be purely object oriented pgmng language. In C++ it use compiler for debugging.but java is both compiled and interpreted, and java is used in network based applications, its a highly secured language too and machine independent is other feature of java. read less