单项选择题 10. public class Foo implements java.io.Serializable {  11. private int x；  12. public int getX（） { return x； }  12.publicFoo（int x）{this.x=x； }  13. private void writeObject（ ObjectOutputStream s）  14. throws IOException {  15. // insert code here  16. }  17. }  Which code fragment， inserted at line 15， will allow Foo objects to be correctly serialized and deserialized？（）

单项选择题 Assuming that the serializeBanana2（） and the deserializeBanana2（） methods will correctly use Java serialization and given：  import java.io.*；  class Food {Food（） { System.out.print（”1”）； } }  class Fruit extends Food implements Serializable {  Fruit（） { System.out.print（”2”）； } }  public class Banana2 extends Fruit { int size = 42；  public static void main（String [] args） {  Banana2 b = new Banana2（）；  b.serializeBanana2（b）； // assume correct serialization  b = b.deserializeBanana2（b）； // assume correct  System.out.println（” restored “+ b.size + “ “）； }  // more Banana2 methods  }  What is the result？（）

单项选择题 Assuming that the serializeBanana（） and the deserializeBanana（） methods will correctly use Java serialization and given：  import java.io.*；  class Food implemertts Serializable {int good = 3；}  class Fruit externds Food {int juice = 5；}  public class Banana extends Fruit {  int yellow = 4；  public static void main（String [] args） {  Banana b = new Banana（）； Banana b2 = new Banana（）；  b.serializeBanana（b）； // assume correct serialization  b2 = b.deserializeBanana（）； // assume correct  System.out.println（”restore “+b2.yellow+ b2.juice+b2.good）；  }  // more Banana methods go here  }  What is the result？（）