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When an object is created the constructor of that class is called. The object obj2 is destroyed when the if block ends because it was created inside the if block. And the object obj1 is destroyed when the main function ends.
In this example we will use default argument to have a single definition for both defualt and parameterized constructor. Here, in this program, a single Constructor definition will take care for both these object initializations. We don't need separate default and parameterized constructors. Learn Core Java. Java Examples Java 8 Java 11 Java HTML 5 Interactive. CSS Interactive. C Language. Advanced Data Structure. Operating System. Computer Network.
Computer Architecture. Android Development. This is known as automatic initialization of objects. Each time an instance of a class is created the constructor method is called. Constructors is a special member function of class and it is used to initialize the objects of its class.
It is treated as a special member function because its name is the same as the class name. These constructors get invoked whenever an object of its associated class is created. It is named as "constructor" because it constructs the value of data member of a class. Initial values can be passed as arguments to the constructor function when the object is declared.
Do nothing constructors are that type of constructor which does not contain any statements. Do nothing constructor is the one which has no argument in it and no return type. The default constructor is the constructor which doesn't take any argument. It is used to allocate the memory to an object of the class. It is called whenever an instance of the class is created. It can be defined manually with arguments or without arguments. There can be many constructors in class.
It can be overloaded but it can not be inherited or virtual. There is a concept of copy constructor which is used to initialize a object from another object. It helps to deallocate the memory of an object. It is called while object of the class is freed or deleted. It is always called in the reverse order of the constructor.
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