Oracle
1Z0-829 · Question #20
1Z0-829 Question #20: Real Exam Question with Answer & Explanation
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Using Java I/O API
Question
Given the code fragments:
class Car implements Serializable {
private static long serialVersionUID = 454l;
String name;
public Car(String name) { this.name = name; }
public String toString() { return name + " " + flag_MHC; }
}
class LuxuryCar extends Car {
int flag_MHC;
public LuxuryCar(String name, int flag_MHC) {
super(name);
this.flag_MHC = flag_MHC;
}
}
// and:
public static void main(String[] args) {
Car b = new LuxuryCar("Wagon", 200); // line n2
ObjectOutputStream oos = new ObjectOutputStream(new FileOutputStream("car.ser")));
ObjectInputStream ois = new ObjectInputStream(new FileInputStream("car.ser")));
oos.writeObject(b);
System.out.println((Car)(ois.readObject())); // line n3
}
Which action prints Wagon : 200?
Options
- AAt line n1, implement the java.io.Serializable interface.
- BAt line n3, replace readObject () with readline().
- CAt line n3, replace Car with LuxuryCar.
- DAt line n1, implement the java.io.AutoCloseable interface
- EAt line n2, in the main method signature, add throws IOException, ClassCastException.
- FAt line n2, in the main method signature, add throws IOException, ClassNotFoundException.
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Topics
#serialization#exception handling#object I/O#inheritance