2/19/2023 0 Comments Parameterized constructorIf you didn’t declare any constructor in the Child class then compiler will declare one default constructor for you and Parent class default constructor will be called. Output : Parent class no-args constructor calledĪs in the above code we can see that we are not calling any constructor, then the compiler will automatically calls the default constructor of the Parent class.Ĥ. If you didn’t call any constructor of the Parent or Child class then the compiler will automatically call the Default Constructor or no-args Constructor of the Parent class. Output : Exception in thread "main" : Unresolved compilation problems:Ĭonstructor call must be the first statement in a constructorĪt .(Child.java:18)Īt (Child.java:27)ģ. Call to another constructor of the same class or the parent class should be the first line, If not we will be getting the error like “Constructor call must be the first statement in a constructor”. Constructor Overloading is nothing but having more than one constructor in the same class whereas Constructor Chaining involves calling of both Parent class and Child class.Ģ. There is a lot of difference between Constructor Overloading and constructor chaining don’t get confused with those. Output : Parent class Parameterized constructor called by JIPĬhild class Parameterized constructor called by JIPĬhild class no-args constructor called Important Points to remember :ġ. ("Child class Parameterized constructor called by "+name) ("Child class no-args constructor called") ("Parent class Parameterized constructor called by "+name) ("Parent class no-args constructor called") In this Java program we will show how to call constructor using both this and super keyword. Same way super() will call the Default constructor of the Parent class whereas super(parameter) will call a parameterized constructor of the Parent class.īelow code is the example of constructor chaining in Java.this() will call the Default Constructor of the same class whereas this(parameter) will call a parameterized constructor of the same class.If you didn’t call the Parent class Constructor then the compiler will be automatically calling the Parent class no-args constructor by itself.
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