Pre-Quiz 3-Spring 2007 Questions
Q2. What is the major difference between Stacks and Queues with respect to how elements are added and removed from each?
Stacks - FILO (first in last out)
Queue - FIFO (first in first out) |
| Question: What is a GUI tree? can you ellaborate please? |
- A GUI tree is just a tree representation of the elements in a GUI. The children are the items contained within a panel.
Dawn Finney
Q3. What is the difference between a FlowLayout, GridLayout, and BorderLayout?
- Flow Layout - left to right, no extra space
- Border Layout - Center item gets extra space
- Grid Layout - same size components
Q4B)
Is there a better way to do this?
(the name is changed to PreQuiz3GUIAnswer instead of StringReverseGUI)
import java.awt.*;
import java.awt.event.*;
import javax.swing.*;
public class PreQuiz3GUIAnswer extends JFrame{
JTextField txtInput;
String rvrseTxt = "";
JLabel display;
public PreQuiz3GUIAnswer(){
setLayout (new BorderLayout());
txtInput = new JTextField("Type Something Here");
JButton button1 = new JButton("Forward");
display = new JLabel("");
button1.addActionREMOVEDstener(new ActionREMOVEDstener(){
public void actionPerformed(ActionEvent ae){
display.setText(txtInput.getText());
}
});
JButton button2 = new JButton("Reversed");
button2.addActionREMOVEDstener(new ActionREMOVEDstener(){
public void actionPerformed(ActionEvent ae){
for (int i=0; i<txtInput.getText().length(); i++) {
rvrseTxt = txtInput.getText().substring(i, i+1) + rvrseTxt;
}
display.setText(rvrseTxt);
rvrseTxt = "";
}
});
add(txtInput, BorderLayout.NORTH);
add(button1, BorderLayout.WEST);
add(button2, BorderLayout.EAST);
add(display, BorderLayout.SOUTH);
this.pack();
this.setVisible(true);
}
public static void main(String[]args){
PreQuiz3GUIAnswer prequiz = new PreQuiz3GUIAnswer();
}
}
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