the correct answerAssuming that all the necessary imports are done, what will be the output of the following Java program? class parent { int a; } class child extends parent { int b; void display() { super.a = b + 1; System.out.println(b + " " + i); } } class inheritance { public static void main(String args[]) { child obj = new child(); obj.a=1; obj.b=2; obj.display(); }}
Question
the correct answerAssuming that all the necessary imports are done, what will be the output of the following Java program? class parent { int a; } class child extends parent { int b; void display() { super.a = b + 1; System.out.println(b + " " + i); } } class inheritance { public static void main(String args[]) { child obj = new child(); obj.a=1; obj.b=2; obj.display(); }}
Solution
The program will not compile because there is no variable 'i' defined in the 'display()' method of the 'child' class. The line 'System.out.println(b + " " + i);' is trying to print the value of 'i', which is not declared anywhere in the program.
To fix this, you should replace 'i' with 'a' (the variable from the parent class that is inherited by the child class). The corrected 'display()' method would look like this:
void display() { super.a = b + 1; System.out.println(b + " " + a); }
With this correction, the output of the program would be "2 3". This is because 'b' is 2 (as set in the main method) and 'a' is 'b + 1', which is 3.
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