Answers for Practice Final D

Part A.

1. b     i  temp a[0] a[1] a[2] a[3]     Output:
        ---+----+----+----+----+----+    42 12 39 49
         0   39   39   49   42   12
                  49   39   
         2   42   49   39   12   42

2. a     A BufferedReader need not get its data from a disk file.
         It can also get its data from an InputStreamReader.

3. b     To qualify as an ActionListener, an object must
         (1) announce its intention to be an ActionListener with
                 "implements ActionListener"
         (2) contain an actionPerformed method.

Part B.

1.        f             g             
       x   RetVal   y    RetVal    Output:
     -----+------++-----+-------   263 331
       Call 1    ||  Call 1
     -----+------++-----+-------
      16  |  259 ||  5  |  15
     -----+------++-----+-------
       Call 2    ||  Call 2
     -----+------++-----+-------
       3  |  12  || 14  |  33 
     -----+------++-----+-------

2. 
    public static void main(String[] args) throws IOException
    {
        String line, name;
        char gender;
        int age, count = 0;
        double salary, maxF = -1.0, minM = 9000000000.0;

        BufferedReader br = new BufferedReader(
            new FileReader("c:\\salaries.txt");

        line = br.readLine();
        while(line != null)
        {
            StringTokenizer st = new StringTokenizer(line, ",");
            name = st.nextToken().trim();
            gender = st.nextToken().trim().charAt(0);
            salary = Double.parseDouble(st.nextToken().trim());
            if(gender == 'F' && salary > maxF)
                maxF = salary;
            else if(gender == 'M' && salary < minM)
                minF = salary;
            line = br.readLine();
        }
        System.out.println("Max salary for women is " + maxF + ".");
        System.out.println("Min salary for men is " + minM + ".");
    }
           
3.
    public class Applet extends Applet implements ActionListener 
    {
        private TextField t;
        private Button b;
        private int count;
        private double sum;

        public void init()
        {
            t = new TextField(12);
            b = new Button("Submit");
            count = 0;
            sum = 0.0;

            add(t);
            add(b);
            b.addActionListener(this);
            t.addActionListener(this);
            setSize(125, 100);
        }

        public void actionPerformed(ActionEvent e)
        {
            if (t.getText().equals(""))
                t.setText(String.valueOf(sum / count));
            else
            {
                count++;
                sum += Double.parseDouble(t.getText());
            }
        }
    }