Java Constructors generally.

Java Constructors generally

• A constructor is a special method with the same name as its class and has no return.
• A constructor is called by the Java system when a new class instance is created (an object).
• This gives the class an opportunity to set up initials for use during the object's lifetime.
• A constructor can accept arguments and can be overloaded as other methods.
• Constructors are not, however, inherited or overrided like other methods.
• The default constructor is the no-argument constructor automatically generated unless you define another constructor. However, if you define at least one constructor, the default constructor is not generated.
  Constructor example:

  public class Person {
    private int age;
    private String name="Nobody";
  // Constructor with two parameters
  // As this constructor is created - 
  // no default constructor will be generated  
    public Person(int age, String name) {
      this.age = age;
      this.name = name;
    }
  
    public int getAge() {
      return age;
    }
  
    public void setAge(int age) {
      this.age = age;
    }
  
    public String getName() {
      return name;
    }
  
    public void setName(String name) {
      this.name = name;
    }
     public static void main(String args[]) {
       Person ricard= new Person(23,"Ricard");
       System.out.println("First person is called "
               +ricard.getName()+" and is "
               +ricard.getAge()+" years");
     }
  }

  The result of this is:

  First person is called Ricard and is 23 years

  You can download this example here (needed tools can be found in the right menu on this page).