Java Constructors
One of the simplest methodologies of learning a subject is through Questions/Answers. I believe in this. 17 questions with answers on Constructors Java are given. 1. What is constructor? 2. Define constructor in Java? 3. What is class constructor in Java? 4. What is the return of constructor? One of the Java constructs (with which …
Constructors Java: Learn through Questions and Answers Read More »
The constructs (building blocks) of a Java class are variables, constructors, methods and some rarely used static blocks etc. Now let us discuss Java Constructor. 1. What is constructor or features of constructor? A Java Constructor has the following two features. A constructor looks like a method but without any return type (even void should …
A constructor looks more like a method but without return type. Moreover, the name of the constructor and the class name should be the same. The advantage of constructors over methods is that they are called implicitly whenever an object is created. In case of methods, they must be called explicitly. To create an object, …
The magic of super() We have seen earlier, the usage of this() statement where it is used to call in between the constructors belonging to the same class. Here no inheritance is involved. Now in this posting, let us learn how to call a super class constructor from subclass constructor. Example on super() class Animal …
Calling Constructor from Constructor requires precautions on usage. Read and understand carefully. What is a constructor and what is its role in programming? A constructor is that one which is called implicitly when an object is created in Java. A constructor gives properties to an object while it is being created itself. Else, separate methods …
In Java, both this and this() are entirely different with different functionalities. Functionalities (Purposes) this keyword is used to refer always current object this() is used to access one constructor from another where both constructors belong to the same class Following table illustrates the differences. this keyword this() Used with objects only Used with constructors …
Difference between this and this() in Java with Example Read More »
super and super() look alike, but they are very different in their functionality (purpose). super with variables and methods: super is used to call super class variables and methods by the subclass object when they are overridden by subclass. super() with constructors: super() is used to call super class constructor from subclass constructor. Let us …
What is difference between super and super() in Java? Read More »
Java comes with a set of special set of Constructor Properties. List of Constructor Properties What can not? 1. "A constructor cannot be abstract, static, final, native, strictfp, or synchronized". 2. Interface cannot have constructor. 3. Constructor cannot return a value. What can? 1. A constructor can be private. 2. Abstract class can have constructor. …
