Questions and Exercises (The Java™ Tutorials Essential Java Classes (original) (raw)

Questions

1. Is the following code legal?
2. What exception types can be caught by the following handler? What is wrong with using this type of exception handler?
3. Is there anything wrong with the following exception handler as written? Will this code compile?
   try {
   } catch (Exception e) {

} catch (ArithmeticException a) {

} 4. Match each situation in the first list with an item in the second list.

1. int[] A; A[0] = 0;
2. The JVM starts running your program, but the JVM can't find the Java platform classes. (The Java platform classes reside in classes.zip or rt.jar.)
3. A program is reading a stream and reaches the end of stream marker.
4. Before closing the stream and after reaching the end of stream marker, a program tries to read the stream again.
5. __error
6. __checked exception
7. __compile error
8. __no exception

Exercises

1. Add a readList method to ListOfNumbers.java. This method should read in int values from a file, print each value, and append them to the end of the vector. You should catch all appropriate errors. You will also need a text file containing numbers to read in.
2. Modify the following cat method so that it will compile.
   public static void cat(File file) {
   RandomAccessFile input = null;
   String line = null;
   try {
   input = new RandomAccessFile(file, "r");
   while ((line = input.readLine()) != null) {
   System.out.println(line);
   }
   return;
   } finally {
   if (input != null) {
   input.close();
   }
   }
   }
   Check your answers.