The constructor ... is not visible

When you invoke the private constructor of a class in another class, you’ll get the error message “The constructor ... is not visible”. And when the private constructor of a super class is invoked from the subclass implicitly or explicitly, you’ll get the following: Implicit super constructor ... is not visible for default constructor. Must define an explicit constructor. Implicit super constructor...

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modifier static not allowed here

Java error "modifier static not allowed here" can occur for any of the following reasons: 1. Constructor is declared as static(!) A constructor cannot be static. In the wrong code below: public class Person { private String firstName; private String lastName; public static Person() { //... } } Here the constructor Person is declared as static. As the constructor must be non-static, the...

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invalid method declaration; return type required

The Java error "invalid method declaration; return type required" can occur for any of the following reasons: 1. You are trying to define a constructor (of course without any return type; not even void)  but the constructor name is not given same as the class name. See the wrong code below: public class Employee {  private int id;  private String name;  public employee(int id,String...

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recursive constructor invocation

If a constructor calls itself, then the error message "recursive constructor invocation" is shown. It may happen when we overload constructors and call the wrong constructor (itself) accidentally. See the wrong code below: public class Employee {   private int id;   private String name;   public Employee(int id,String name)   {     this.id = id;     this.name...

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call to super must be first statement in constructor

The error message is very clear actually: i) We can call super in the constructor of a subclass ii) If we call super in the constructor of a subclass, it must be the first statement in that constructor; i.e, before writing any other statement we call to super must be made. It is mentionable that, super(parameters) calls the constructor of the super class. See the code below: The super class... public...

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