These different set of values initialized to objects must be passed as arguments when constructor is invoked. Using parameterized constructor, it is possible to initialize objects with different set of values at time of their creation. The constructor which has parameters is known as parameterized constructor. Then we create a class DisplayDemo which inherits the methods from above class Display: class DisplayDemo Let us consider a program to demonstrate the use of the default values, initialize expressions and constructors.įirstly we create a class Display in which we declare default constructor: class DisplayĪ=4 //override default and initializer expression Important Note: Constructors are invoked only after the instance variables of a newly created object of the class have been assigned their default initial values and after their explicit initializers are executed. The default constructor looks like: public Rectangle() Its only purpose is to enable you to create object of class type. It does not contain any parameters and doesn’t even contain any statements in its body. So in such situations, the compiler automatically creates one constructor which is known as default constructor. But in some programs if we don’t create any constructor.
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