What Are Constructor Methods?

Constructors from a conceptual level enable the creation of an object of a given class. Constructor is a method of a class with no return parameters. Constructors also enable the initialization of any variables of a class. You can supply input parameters to constructors.

A class can have more than one constructor. It has the same name as the class itself. A default constructor doesn’t have any parameters. In case of inheritance - if your subclass constructor does not explicitly call the superclass constructor, java will call the super class default constructor. If you want subclass constructor to call a specific superclass constructor, use the ‘super’ keyword.

Example:

Class Book
{
	String title;
	String publisher;
	float price;
        public Book()
        {
        }
        public Book(String title)
        {
          this.title = title;
        }
}
Class TextBook extends Book
{
	public TextBook(){
}
public TextBook(String title)
{
	super(title);
}

FAQ Home

 

Advertisement

Free Magazine