Regarding error in my program

Question

In the program, when i extend z class i got an error.so when i put
an z(){} its working.But the same program when i dont extend class
z im not getting the error.why is it so? kindly help me
class z
int x;
z(int a) {
System.out.println("parentconstructor");
class xy extends z
public static void main(String args[])
System.out.println("hello world");
z as=new z(5);
}

Answer 1

The problem isn't that you are calling the method that doesn't exist, the problem is that the compiler is creating a method that, if called, will call a method that doesn't exist.
It's just as if you put a method in your class that was never called, but contained calls to nonexistant methods, the compiler would still find errors.