Constructors in java.

  • A Java constructor is special method that is called when an object is instantiated.
  • In other words, when you use the new keyword.
  • The purpose of a Java constructor is to initializes the newly created object before it is used.
  • This Java constructors tutorial will explore Java constructors in more detail.
Here is a simple example that creates an object, which results in the class constructor being called: 
MyClass myClassObj = new MyClass();

This example results in a new MyClass object being created, and the no-arg constructor of MyClass to be called. 

  • A Java class constructor initializes instances (objects) of that class.
  • Typically, the constructor initializes the fields of the object that need initialization.
  • Java constructors can also take parameters, so fields can be initialized in the object at creation time. 
    public class MyClass {

    public MyClass() {

    }
}
The constructor is this part:

    public MyClass() {

    }

    Constructor overloading example :

    public class MyClass {

    private int number = 0;

    public MyClass() {
    }

    public MyClass(int theNumber) {
        this.number = theNumber;
    }

Posted on by
Score
Views