JButton muss den JTextfield-Text ändern
Das sind Hausaufgaben. Beginn der Java-Klasse. Ich wickle immer noch meinen Kopf um dieses Zeug.
Das Projekt besteht darin, ein Inventory Management System zu erstellen.
Ich habe alles herausgefunden, außer wie man mit dieser Schaltfläche den Text in einem JTextField ändert. Es muss Informationen aus einem Array eines Produkts (in diesem Fall DVDs) hinzufügen. In diesem Buch werden verschiedene Methoden zum Verwalten von Schriftarten, Positionen und Zuständen eines JTextField beschrieben, jedoch nicht das Formatieren oder Aufrufen einer Methode für den Text.
Hier ist ein Beispiel dafür, was ich mit einer JTextArea machen möchte. Dies ist im Wesentlichen das, was ich mit meinen JTextFields machen möchte.
...
// setup the interface
JPanel panel = new JPanel();
txt = new JTextArea(15,40);
txt.setEditable(false);//user shouldn't change it
panel.add(txt);
JButton next = new JButton("Next");
panel.add(next);
getContentPane().add(panel);
displayDVD();
}
// view software
public void displayDVD() {
txt.setText("DVD Details:\n");
txt.append("Item number: " + inv.get(currentDisplay).getItem() + "\n");
txt.append("DVD name: " + inv.get(currentDisplay).getName() + "\n");
txt.append("Units in stock: " + inv.get(currentDisplay).getUnits() + "\n");
txt.append("Price: $" +
String.format("%.2f",inv.get(currentDisplay).getPrice()) + "\n");
txt.append("Total value: $" +
String.format("%.2f",inv.get(currentDisplay).value()) + "\n");
txt.append("Fee: $" + String.format("%.2f",inv.get(currentDisplay).fee()) + "\n\n");
txt.append("Total value: $" + String.format("%.2f",inv.value()));
}
Und hier ist mein aktueller Code
// GUI with navigation and file manipulation buttons
import javax.swing.*; // provides basic window features
import java.awt.event.*;
import java.awt.GridLayout;
import java.awt.BorderLayout;
public class AppGUI extends JFrame
{
private Inventory inv;
private int currentDisplay = 0;
private JPanel topButtonJPanel;
private JButton topButtons[];
private JPanel labelJPanel;
private JLabel labels[];
private JPanel fieldJPanel;
private JTextField fields[];
private JPanel buttonJPanel;
private JButton buttons[];
// LabelFrame constructor adds JLabels to JFrame
public AppGUI()
{
super( "Inventory Program v.5" );
setLayout( new BorderLayout() ); // set frame layout
setDefaultCloseOperation(JFrame.EXIT_ON_CLOSE);// quit if the window is closed
// initialize values
RatedDVD d1 = new RatedDVD(1, "The Invisible Man", 0, 4999.99, "PG");
RatedDVD d2 = new RatedDVD(2, "The Matrix", 1, 13.01, "PG13");
RatedDVD d3 = new RatedDVD(3, "Se7en", 7, 11.11, "R");
RatedDVD d4 = new RatedDVD(4, "Oceans Eleven", 11, 9.02, "PG13");
RatedDVD d5 = new RatedDVD(5, "Hitch Hikers Guide to the Galaxy", 42, 10.00, "G");
// create inv and enter values
inv = new Inventory();
inv.add(d1);
inv.add(d2);
inv.add(d3);
inv.add(d4);
inv.add(d5);
inv.sort();
topButtons = new JButton[ 6 ]; // create topButtons array
topButtonJPanel = new JPanel(); // set up panel
topButtonJPanel.setLayout( new GridLayout( 1, topButtons.length, 2, 2 ) );
topButtons[0] = new JButton( "Load file" );
topButtons[1] = new JButton( "Add" );
topButtons[2] = new JButton( "Modify" );
topButtons[3] = new JButton( "Delete" );
topButtons[4] = new JButton( "Search" );
topButtons[5] = new JButton( "Save" );
for(int count=0;count<topButtons.length;count++){topButtonJPanel.add(topButtons[count]);}
//add( topButtonJPanel, BorderLayout.NORTH ); // this is for next weeks assignment
labels = new JLabel[8];
labelJPanel = new JPanel();
labelJPanel.setLayout( new GridLayout( labels.length, 1 ));
labels[0] = new JLabel( "Item ID" );
labels[1] = new JLabel( "Name" );
labels[2] = new JLabel( "Rating" );
labels[3] = new JLabel( "# in Stock" );
labels[4] = new JLabel( "Price" );
labels[5] = new JLabel( "Restocking Fee" );//[DEBUG] ref actual Variable
labels[6] = new JLabel( "Inventory Value with Fee (5%)" );
labels[7] = new JLabel( "Total Value with Fee(for all items)" );
for(int count=0;count<labels.length;count++){labelJPanel.add(labels[count]);}
add( labelJPanel, BorderLayout.WEST );
fields = new JTextField[8];
fieldJPanel = new JPanel();
int spaces = 28;
fieldJPanel.setLayout( new GridLayout( labels.length, 1 ));
fields[0] = new JTextField( "", spaces );
fields[1] = new JTextField( "", spaces );
fields[2] = new JTextField( "", spaces );
fields[3] = new JTextField( "", spaces );
fields[4] = new JTextField( "", spaces );
fields[5] = new JTextField( "", spaces );
fields[6] = new JTextField( "", spaces );
fields[7] = new JTextField( "", spaces );
for(int count=0;count<fields.length;count++)
{
fields[count].setEditable( false );
fieldJPanel.add(fields[count]);
}
add( fieldJPanel, BorderLayout.EAST );
buttons = new JButton[ 5 ]; // create buttons array
buttonJPanel = new JPanel(); // set up panel
buttonJPanel.setLayout( new GridLayout( 1, buttons.length, 2, 2 ) );
buttons[0] = new JButton( "First" );
buttons[0].addActionListener(new ActionListener() {
public void actionPerformed(ActionEvent e) {
if (currentDisplay != 0)currentDisplay = 0; //advance to the end
}
});
buttons[1] = new JButton( "Prev" );
buttons[1].addActionListener(new ActionListener() {
public void actionPerformed(ActionEvent e) {
if (currentDisplay != 0)currentDisplay--; //advance to the end
else currentDisplay = (inv.size()-1);
}
});
Icon bug1 = new ImageIcon( getClass().getResource( "bug1.gif" ) );
buttons[2] = new JButton( bug1 );
buttons[3] = new JButton( "Next" );
buttons[3].addActionListener(new ActionListener() {
public void actionPerformed(ActionEvent e) {
if (currentDisplay < inv.size()-1)currentDisplay++; //advance to the end
else currentDisplay = 0; stkover
}});
buttons[4] = new JButton( "Last" );
buttons[4].addActionListener(new ActionListener() {
public void actionPerformed(ActionEvent e) {
if (currentDisplay != inv.size()-1)currentDisplay = inv.size()-1; //advance to the end
else currentDisplay = (inv.size()-1);
}
});
for(int count=0;count<buttons.length;count++){buttonJPanel.add(buttons[count]);}
add( buttonJPanel, BorderLayout.SOUTH );
}// end method
}// end class AppGUI
Irgendwelche Tipps oder Stupser sind willkommen. Tu aber bitte nicht alles für mich.