CODEWITHSUNDEEP
javainheritanceconstructor
Dr. Sikandar
Dr. Sikandar

Reputation: 13

Compile error: constructor A in class A cannot be applied to given types

I want to initialize instance variables with constructors but I get a compile error.

class Test{


    public static void main(String[] args){

        A a = new A(5,6);
        System.out.println(a.i);
    }
}

class A{
    int i, k;
    A(int a, int b){
        this.i=a;
        this.k=b;   
    }
}

class B extends A{
    int k;
    B(int a, int b, int c){
        this.k = a;
    }
}

The error is:

Test.java:26: error: constructor A in class A cannot be applied to given types;
        B(int a, int b, int c){
                              ^
  required: int,int
  found: no arguments
  reason: actual and formal argument lists differ in length
1 error

Upvotes: 0

Views: 156

Answers (2)

Ali Ben Zarrouk
Ali Ben Zarrouk

Reputation: 2020

Well, your problem is that you cannot construct an object B without constructing first an object A. If you had a default constructor in A, you wouldnt need to call super in B ( it will be automatically called though ).

Upvotes: 0

Murat Karagöz
Murat Karagöz

Reputation: 37594

You are missing the super call in B. You can fix it by using

class B extends A{
    int k;
    B(int a, int b, int c){
        super(a,b);
        this.k = a;
    }
}

Also you probably meant to use this.k = c.

Upvotes: 3

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