Java – even if we have a constructor, how do we initialize variables to default values

I have a question about the default constructor in Java

Suppose I have two files, a.java

public class a
{
    int x;

    public a(int z)
    {
        if(z > 0)
        {
            x = z;
        }
    }

    public  void get()
    {
        System.out.println(x);
    }
}

And b.java

public class b
{
    public static void main(String[] args)
    {
        a obj = new a(-4);

        obj.get();
    }
}

Now the condition (z > 0) fails here, so x is initialized to zero But what is this, because they have no default constructor in class A

resolvent

Solution

Source

This means that the compiler will do this for you when you build the program