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11. java.io package and Serialization

Q: 09 Click the Task button.

Solution:
1. String path=” “;
2. path=path+File.separator+dir;
3. File file=new File(path,filename);
4. return file.exists();

Q:10 Click the Exhibit button.

Which code, inserted at line 14, will allow this class to correctly serialize and deserialize?

A. s.defaultReadObject();
B. this = s.defaultReadObject();
C. y = s.readInt(); x = s.readInt();
D. x = s.readInt(); y = s.readInt();
Answer: D

Question: 11
Given:

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?
A. s.writeInt(x);
B. s.serialize(x);
C. s.writeObject(x);
D. s.defaultWriteObject();

Answer: D
12 Click the Task button.

Solution:
import java.io.*;
            public class ReadFile{
             public static void main(String s[ ]){
                    try {
                        File x1=new File("MyText.txt");
                        FileReader x2=new FileReader(x1);
                        BufferedReader x4=new BufferedReader(x2);
                        String s3=null;
                      while((x3 = x4.readLine( )) != null )  {
                        System.out.println(x3);
                        }x4.close( );
                     }catch(Exception e){
                        e.printStackTrace();
                        }
            }
}

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