Given the code fragments:

interface Exportable {
void export();
}

class Tool implements Exportable {
public void export() {
System.out.println("Tool::export");
}
}

class ReportTool extends Tool implements Exportable {
public void export() {
System.out.println("RTool::export"); // line n1
}

public static void main(String[] args) {
Tool atool = new ReportTool();
Tool btool = new Tool();
Exportable ctool;
callExport(btool);
}

public static void callExport(Exportable ex) {
ex.export(); // line n2
}
}

What is the result?

Question

Given the code fragments:

interface Exportable {
 void export();
}

class Tool implements Exportable {
 public void export() {
 System.out.println("Tool::export");
 }
}

class ReportTool extends Tool implements Exportable {
 public void export() {
 System.out.println("RTool::export"); // line n1
 }

public static void main(String[] args) {
 Tool atool = new ReportTool();
 Tool btool = new Tool();
 Exportable ctool;
 callExport(btool);
 }

public static void callExport(Exportable ex) {
 ex.export(); // line n2
 }
}

What is the result?

Accepted Answer

B. Compilation fails only at line n1.

Answer

A. Compilation fails at both line n1 and line n2.

Answer

C. Compilation fails only at line n2.

Answer

D. Too1 :: export
Too1 :: export

Answer

E. RToo1 :: export
Too1 :: export

Given the code fragments: interface Exportable { void export(); } class Tool implements Exportable { public void export() { System.out.println("Tool::export"); } } class ReportTool extends Tool…