Core Java

Java puzzlers from OCA part 6

Even for new Java developers, constructors are probably no big mystery. In essence, when you create an instance of a class, the constructor of this class is started. In the 6th part of Java Puzzlers series, we will see a case related to constructors.

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public class Puzzler {
 
    public Puzzler(){
        System.out.println("Puzzler no arg constructor");
    }
 
    public static void main(String[] args){
        Puzzler puzzler = new Puzzler();
    }
}

In the example above Puzzler() constructor will start and “Puzzler no arg constructor” will be printed to the screen. Now lets see a new example.

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public class Puzzler {
 
    public void Puzzler(){
        System.out.println("Puzzler no arg constructor?");
    }
 
    public static void main(String[] args){
        Puzzler puzzler = new Puzzler();
    }
}

As you can see we added a return value to the constructor of Puzzler and you may expect that “Puzzler no arg constructor?” will get printed but this is not right. When we add a return value to the constuctor, it stops being a constructor. So it won’t get started when a new instance is created.

Published on Java Code Geeks with permission by Sezin Karli, partner at our JCG program. See the original article here: java puzzlers from oca part 6

Opinions expressed by Java Code Geeks contributors are their own.

Sezin Karli

Mathematics Engineer & Computer Scientist with a passion for software development. Avid learner for new technologies. Currently working as Senior Software Engineer at Sahibinden.com.
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