Stack samt peek og size nogen der kan hjælpe der
Jeg har lavet det her.import javax.swing.*;
import java.awt.*;
import java.awt.event.*;
import java.util.*;
public class GUI extends JFrame implements ActionListener {
private java.util.Stack hat1 = new java.util.Stack();
private JTextField input = new JTextField(5);
private JTextArea output = new JTextArea(15,10);
private JButton tilfoej = new JButton("Tilføj");
private JButton smugkig = new JButton("Smugkig");
private JButton tagAf = new JButton("Tag af");
private JButton stoerrelse = new JButton("Størrelse");
private JTextField output1 = new JTextField(5);
private String stackString ="";
//Methods
//Constructor
public GUI(){
JLabel inputLab = new JLabel("Indtast data");
JPanel dataPanel = new JPanel();
JPanel buttonPanel = new JPanel();
JLabel inputLab1 = new JLabel("Uddata: Kigge / tag af");
JPanel dataPanel1 = new JPanel();
JLabel outLab = new JLabel("Stakken");
JPanel dataPanel2 = new JPanel();
getContentPane().setLayout(new FlowLayout());
dataPanel.add(inputLab);
dataPanel.add(input);
getContentPane().add(dataPanel);
input.requestFocus();
buttonPanel.add(tilfoej);
buttonPanel.add(smugkig);
buttonPanel.add(tagAf);
buttonPanel.add(stoerrelse);
getContentPane().add(buttonPanel);
dataPanel2.add(outLab);
dataPanel2.add(output);
getContentPane().add(dataPanel2);
getContentPane().add(output);
smugkig.addActionListener(this);
tilfoej.addActionListener(this);
tagAf.addActionListener(this);
stoerrelse.addActionListener(this);
dataPanel1.add(inputLab1);
dataPanel1.add(output1);
getContentPane().add(dataPanel1);
}
public void actionPerformed(ActionEvent hat){
Object buttomPressed = hat.getSource();
if (buttomPressed == tilfoej){
stackString += "\n"+input.getText();
output.setText(stackString);
hat1.push(input.getText());
}
else if
(buttomPressed == smugkig){
output1.setText(""+hat1.peek());
}
else if
(buttomPressed == tagAf){
stackString = stackString.substring(0, stackString.lastIndexOf('\n'));
output.setText(stackString);
}
else if
(buttomPressed == stoerrelse){
output1.setText(""+hat1.size());
}
}
public static void main (String [] args){
GUI gui = new GUI();
gui.setSize(375,425);
gui.setVisible(true);
gui.setTitle("Stack mig i biiiip");
gui.addWindowListener(
new WindowAdapter() {
public void windowClosing(WindowEvent e){
System.exit(0);
}
}
);
}
}
Når jeg har skrevet noget ind kan den godt peek og size MEN når jeg så fjerne en tekst eller flere viser peek og size stadig startværdigen. Jeg kan ikke finde løsningen er der nogen der kan hjælpe??
