We can use methods as if they were objects, or primitive values. In Java 8, thanks to lambda expressions, we can do something like this. Wouldn't it be more practical to just pass the method as an argument? For example: isFull(list.size) If we only use a method of an object in another method, we still have to pass the full object as an argument. Or by using existing objects: List list2 = list Concepts like constructors are simple but are extremely important as they involve classes and objects.In Java, we can use references to objects, either by creating new objects: List list = new ArrayList() Now that you have a grip on what constructors are and how to work with them, you are one step closer on your journey to learn Java. Rectangle obj2 = new Rectangle(2,4,"Green") ("Length-" + length + "Breadth-" + breadth+ "Color" + color) Based on different types or number of arguments, different constructors will be called.Įxample illustrating Constructor Overloading: Constructor OverloadingĬonstructor supports method overloading just like any other class. The default constructor initializes “member” variable to “YES” and then continues to execute parameterized constructor. In the above example, when parameterized constructor in invoked, it first calls the default constructor with the help of this() keyword. (studentName + " -" + studentAge+ "-"+ "Member" + member) * this is used for calling the default constructor this keyword fulfills this purpose.Įxample illustrating call to a default constructor from a parameterized constructor: Sometimes there is a need to call the default constructor from another constructor of the same class. Calling Default Constructor From A Parameterized Constructor in Java Finally, when we print both object’s studentName variable using display function we get “Manan”. We then pass obj1 as an argument while creating obj2. In the above example, we initialize obj1 using a string. * passing the object as an argument for the constructor In this way parameterized constructors fulfills the need to copy one object’s values to another.Įxample illustrating Passing Objects as Arguments: We can also pass arguments while creating other instances of a class. With a parameterized constructor for a class, one must provide initial values as arguments, otherwise, the compiler reports an error. Display method then gives the desired output. The constructor then initializes studentName and studentAge using the passed values. In the above example, we are passing a string and an integer to the object. (studentName+ " "+studentAge) Įdureka myObj = new Edureka("Manan", 19) To initialize data members of a class with distinct values.Įxample illustrating Parameterized Constructor: Parameterized Constructor – A constructor is called Parameterized Constructor when it accepts a specific number of parameters. It is used to initialize an object’s data members.Įdureka()
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