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单项选择题 import java.io.*；  public class Forest implements Serializable {  private Tree tree = new Tree（）；  public static void main（String [] args） {  Forest f= new Forest（）；  try {  FileOutputStream fs = new FileOutputStream（”Forest.ser”）；  ObjectOutputStream os = new ObjectOutputStream（fs）；  os.writeObject（f）； os.close（）；  } catch （Exception ex） { ex.printStackTrace（）； }  }  }  class Tree { }  What is the result？（） 

A、 Compilation fails.

B、 An exception is thrown at runtime.

C、 An instance of Forest is serialized.

D、 A instance of Forest and an instance of Tree are both serialized.

  • B

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