Can you call a constructor of a class inside another constructor?
Yes, it is possible to call one constructor from another constructor within the same class in Java. This is known as constructor chaining.
To call one constructor from another constructor, you can use the this
keyword and pass the required arguments to the desired constructor. Here is an example:
public class MyClass { int x; int y; public MyClass() { this(0, 0); } public MyClass(int x, int y) { this.x = x; this.y = y; } }
In this example, the MyClass
class has two constructors: a default constructor that takes no arguments, and a second constructor that takes two int
arguments. The default constructor calls the second constructor using the this
keyword and passes the values 0
and 0
as arguments.
Constructor chaining can be useful when you want to create a class with multiple constructors that all perform similar tasks, but with different arguments. It allows you to avoid duplicating code by calling a common constructor from the other constructors.
It is important to note that the first line of every constructor must be a call to another constructor or a call to the super
class, using the super
keyword. If a constructor does not include a call to another constructor or to the super
class, the compiler will automatically insert a call to the default superclass constructor.
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