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inheritance

 
Greenhorn
Posts: 28
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hi,
this q is from Thinking in java.
create 2 classes A and B with constructors that have arguments. Inherit a new class called C from A, create a member B inside C. Create a constructor for C and perform all initializatio within C's constructor. can anyone suggest a code for this. mine(given below give a compiler error-"No constructor matching A() found in class A"
class A {
int i;
A(int k) {
System.out.println("in A");
i = k;
}
}
class B {
int j;
B(int k) {
System.out.println("in B");
j = k;
}
}
public class C extends A {
B b = new B(4);
C() {
System.out.println("in C");
}
public static void main(String[] arrgs) {
C c = new C();
}
}
 
Ranch Hand
Posts: 47
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Bhuvana,
If you do not explicitly provide a call to the constructor of the super class in the constructor of its inherited class, a call to super() will automatically be provided as the first line in the constructor of the inherited class. Therefore, since the C() constructor in class C does not call super in its first line a call to the default super() is automatically provided for you. However, in class A you do not have a default constructor of the form A(). This causes the compiler to complain about the missing constructor A() in A. This can be corrected by providing a call to super(x) in the C() constructor where x is an integer value used to initialize i in class A.
Hope this helps,
Bob Kerfoot - SCJP
 
Bhuvana Dhruva
Greenhorn
Posts: 28
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thanks a million. i got it!
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