How can I call one constructor from another in Java?

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Aryan Kumar · Answer

Sure! Here's how you can call one constructor from another in Java:

To call one constructor from another in Java, you can use the this(...) keyword. The this(...) keyword is used to invoke another constructor in the same class.

The following code shows how to call one constructor from another in Java:

class Person {

  private String name;

  public Person() {
    this("John Doe"); // Calls the constructor with the parameter "John Doe"
  }

  public Person(String name) {
    this.name = name;
  }

  public String getName() {
    return name;
  }
}

public class Main {

  public static void main(String[] args) {
    Person person = new Person();
    System.out.println(person.getName()); // Prints "John Doe"
  }
}

In the code above, the Person() constructor calls the Person(String name) constructor. The Person(String name) constructor initializes the name property of the object. The main() method creates a new Person object and prints the value of the name property.

Here are some important things to note about calling one constructor from another in Java:

The this(...) keyword must be the first statement in the constructor that is calling another constructor.
The constructor that is being called must be in the same class as the constructor that is calling it.
The parameters of the constructor that is being called must match the parameters of the constructor that is calling it.

Constructor chaining is a powerful technique that can be used to simplify the code for creating objects. It can also be used to avoid duplicate code.

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How can I call one constructor from another in Java?

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