Exam 3 Answers

1. a.
static JFrame makeWindow(String label,
                  int x, int y, double widthFrac, double heightFrac) {
  JFrame aWindow = new JFrame(label);
  Toolkit theKit = aWindow.getToolkit();       
  Dimension wndSize = theKit.getScreenSize();  
  aWindow.setBounds(x, y,
    (int)(wndSize.width*widthFrac), (int)(wndSize.height*heightFrac));
  return aWindow;  
}

b.
JMenuBar menuBar = new JMenuBar();
myWindow.setJMenuBar(menuBar);

JMenu editMenu = new JMenu("Edit");
JMenu drawMenu = new JMenu("Draw");
menuBar.add(editMenu);
menuBar.add(drawMenu);

JRadioButtonMenuItem radioButton1 =  
  new JRadioButtonMenuItem("Grayscale", false);
JRadioButtonMenuItem radioButton2 =  
  new JRadioButtonMenuItem("Color", false);
drawMenu.add(radioButton1);
drawMenu.add(radioButton2);
ButtonGroup choices = new ButtonGroup();
choices.add(radioButton1);
choices.add(radioButton2);

2. a.
constraints.weightx = constraints.weighty = 1.0;
constraints.fill = constraints.BOTH;
addTextBox(new JTextField("name"),0,0);
addTextBox(new JTextField("enter"),0,1);

b.
constraints.weightx = constraints.weighty = 1.0;
constraints.fill = constraints.BOTH;
addTextBox(new JTextField("name"),0,0);
addTextBox(new JTextField("enter"),1,1);

c.
constraints.weightx = constraints.weighty = 1.0;
constraints.fill = constraints.BOTH;
addTextBox(new JTextField("name"),0,0);
addTextBox(new JTextField("value"),1,0);
constraints.gridwidth = 2;
addTextBox(new JTextField("enter"),0,1);

d.
constraints.weightx = constraints.weighty = 1.0;
constraints.fill = constraints.BOTH;
addTextBox(new JTextField("name"),0,0);
addTextBox(new JTextField("value"),1,0);
constraints.fill = constraints.HORIZONTAL;
addTextBox(new JTextField("enter"),1,1);

3.
class MouseHandler extends MouseAdapter {
  public void mouseClicked(MouseEvent e) {
    int i = Integer.parseInt(a.getText());
    int j = Integer.parseInt(b.getText());
    ((JTextField)e.getSource()).setText(String.valueOf(i+j));
  }
}