Exam 2 Answers

1. a.
public class NotLetterException extends Exception {
  private char c;      

  // Default Constructor
  public NotLetterException(){ }

  // Standard constructor
  public NotLetterException(String s) {
    super(s);                              // Call the base constructor
  }

  public NotLetterException(String s, char c) {
    super(s);                    // Call the base constructor
    this.c = c;                    
  }

  // Get the char value for the error
  public char getc() {
    return c;                          
  }
}

b.
  static char toUpperCase(char c) throws NotLetterException{
    if(Character.isLetter(c))
      return Character.toUpperCase(c);
    throw new NotLetterException("The char is not a letter: ",c);
  }

c.
  try{
    char b = toUpperCase(a);
    System.out.println("The letter is " + b);
  }  catch(NotLetterException e) {
    System.out.println(e.getMessage() + e.getc());
  }  finally {
    System.out.println("Finished.");
  }
  }

2. a.
//Create stream output objects.
    File outFile = new File("backup");
    FileOutputStream outStream = new FileOutputStream(outFile);
    FileChannel outChannel = outStream.getChannel();
    ByteBuffer outBuf = ByteBuffer.allocate(1024);

//Create physical file.
    outFile.createNewFile();

b.
    for(int i = 0; i<intArray.length;i++)
      outBuf.putInt(intArray[i]);
    for(int i = 0; i<doubleArray.length;i++)
      outBuf.putDouble(doubleArray[i]);
    outBuf.flip();
    outChannel.write(outBuf);

c.
    IntBuffer intBuf = outBuf.asIntBuffer();
    intBuf.put(intArray);
    outBuf.position(4*intArray.length);
    DoubleBuffer dBuf = outBuf.asDoubleBuffer();
    dBuf.put(doubleArray);
    outBuf.position(outBuf.position() + 8*doubleArray.length);
    outBuf.flip();
    outChannel.write(outBuf);
d.
public class OutArrays implements Serializable {

  int[] intArray;
  double[] doubleArray;
    
  public OutArrays(int[] intArray, double[] doubleArray) {
    this.intArray = intArray;
    this.doubleArray = doubleArray;
  }
}

//Create ObjectOutputStream.
    ObjectOutputStream outData =
      new ObjectOutputStream(outStream);

//Create OutArrays object.
      OutArrays outObject = new OutArrays(intArray, doubleArray);

//Write OutArrays object.
      outData.writeObject(outObject);