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Object Oriented Programming (OOPs)

Question : 4

Total: 72

Which statement is true about the classes and interfaces in the exhibit?

1.public interface A {
2.  public void doSomething(String thing);
3.}

1.public class AImpl implements A { 
2.  public void doSomething(String msg) {}
3.}

1.public class B {
2.  public A doit() {
3.   /*more code here*/
4.  }
5.
6.  public String execute() {
7.   /*more code here*/
8.  }
9.}

1.public class C extends B {
2.  public AImpl doit() {
3.   /*more code here*/ 
4. }
5.
6.  public Object execute() {
7.   /*more code here*/
8.  }
9.}

Compilation will succeed for all classes and interfaces.
Compilation of class C will fail because of an error in line 2.
Compilation of class C will fail because of an error in line 6.
Compilation of class AImpl will fail because of an error in line 2.

Validate

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