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Can we define a parameterized constructor in an abstract class in Java?
Yes, we can define a parameterized constructor in an abstract class.
Conditions for defining a parameterized constructor in an abstract class
- We need to make sure that the class which is extending an abstract class have a constructor and it can call the superclass parameterized constructor.
- We can call the superclass parameterized constructor in a subclass by using super() call.
- If we are not placing super() call in the subclass constructor, a compile-time error will occur.
Example
abstract class AbstractClassTest { AbstractClassTest(int a) { // Parameterized Constructor System.out.println("Parameterized Constructor of an abstract class a="+ x); } } public class Test extends AbstractDemo { Test() { super(20); System.out.println("Test Class Constructor"); } public static void main(String[] args) { Test obj = new Test(); } }
In the above example, we must place a super() call in the subclass constructor (Test), if not a compile-time error will occur.
Output
Parameterized Constructor of an abstract class a=20 Test Class Constructor
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