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New is used to dynamically allocate memory in C++. It will also call the default constructor of a class that is created with it.
int *array; // First declare a pointer
array = new int [5] // Allocate enough memory for a 5 element int array
// To deallocate your memory when you are finished with it, you must call delete on your pointer
delete[] array;
myClassType *mct = new myClassType; // example for class
...
delete mct; // class delete
The virtual keyword means that the class has a static virtual table (vtable) containing function pointers for each type of the class. This enables polymorphism by allowing a pointer to the base class to be assigned an address of any instance of the class in the hierarchy, and then invoking a method through that pointer - which will properly choose the correct method for that class type. Virtual also ensures that the constructors and destructors are invoked in the correct order.
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What is the use of keyword new used in AWT programming?
what is the use of new keyword in awt programming
What keyword is used to find derivative in C plus plus?
The lazy way is to use a dynamic cast. The correct way is to use virtual functions in the base class. That way you don't ever need to know the derived type -- it simply does what is expected of it.
What is the Difference between override and new keyword in C?
An override is the specialisation of a virtual function. The new keyword instantiates an instance of an object in dynamic memory and returns a reference to that object (or null if the object could be instantiated). Both are used in C++, but not C.
What are the 6 ways to use this keyword?
"Java This keyword" is a reference to the current object, it is very helpful when you need to refer an instance of a particular Object from its available methods or using it's constructor, also "this" keyword helps us to avoid naming conflicts.The following are different ways to use java this keyword1) Using with instance variable2) Using with Constructor3) Pass / Return current instanceUsing with instance variableUsing this keyword inside a method or constructor it will use instance variable instead of local variable, in the absence of this keyword it will use local variableUsing with instance variableUsing this keyword inside a method or constructor it will use instance variable instead of local variable, in the absence of this keyword it will use local variableUsing with ConstructorUsing this keyword inside constructor like followingthis("Sony", 20); it will call the constructor having same parameter
Is super keyword is analogous to this keyword in java?
No. The keyword super is used to refer to the parent class instance while the keyword this is used to refer to the current class instance. You need to learn about Inheritance and Object creation using constructors to learn more about these keywords and their use
