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| Question ID 21423 | Given the classes:
class Pupil {
String name = "unknown";
public String getName() { return name; }
}
class John extends Pupil {
String name = "John";
}
class Harry extends Pupil {
String name = "Harry";
public String getName() { return name; }
}
public class Director {
public static void main(String[] args) {
Pupil p1 = new John();
Pupil p2 = new Harry();
System.out.print(p1.getName() + " ");
System.out.print(p2.getName());
}
}
What is the result?
|
| Option A | John Harry
|
| Option B | unknown Harry
|
| Option C | john unknown
|
| Option D | unknown unknown
|
| Option E | Compilation fails.
|
| Option F | An exception is thrown at runtime.
|
| Correct Answer | B |
Explanation Explanation: getName() is missing in John, hence Pupils getName() is invoked and the String in Pupils scope returned.
| Question ID 21424 | Given:
interface Writable {
void write (String s);
}
abstract class Writer implements Writable {
// Line ***
}
Which two statements are true about the writer class?
|
| Option A | It compiles without any changes.
|
| Option B | It compiles if the code void write (String s); is added at line***.
|
| Option C | It compiles if the code void write (); is added at line ***.
|
| Option D | It compiles if the code void write (string s) { } is added at line ***.
|
| Option E | It compiles if the code write () {}is added at line ***.
|
| Correct Answer | A |
Explanation Explanation: An abstract class does not need to implement the interface methods.