First of all sorry for my english. I'm trying to build a program that gets inputs from the user by JOptionPane.showInputDialog() and store it in an HashMap<String, Integer>.
I did it and it works.
But the problem is that i want to print all the HashMap keys and values in a swing component (JList or JTable or something else) but i don't know wich is better and simple to use.
Wich do you suggest?
Masud thanks for your reply but i tryied your code and it gives me an error:
Exception in thread "AWT-EventQueue-0" java.lang.ArrayIndexOutOfBoundsException: 0 >= 0
at java.util.Vector.elementAt(Unknown Source)
at javax.swing.table.DefaultTableModel.setValueAt(Unknown Source)
at javax.swing.JTable.setValueAt(Unknown Source)
at Main.viewAll(Main.java:91)
at Main$1.actionPerformed(Main.java:43)
at javax.swing.AbstractButton.fireActionPerformed(Unknown Source)
at javax.swing.AbstractButton$Handler.actionPerformed(Unknown Source)
at javax.swing.DefaultButtonModel.fireActionPerformed(Unknown Source)
at javax.swing.DefaultButtonModel.setPressed(Unknown Source)
at javax.swing.plaf.basic.BasicButtonListener.mouseReleased(Unknown Source)
at java.awt.Component.processMouseEvent(Unknown Source)
at javax.swing.JComponent.processMouseEvent(Unknown Source)
at java.awt.Component.processEvent(Unknown Source)
at java.awt.Container.processEvent(Unknown Source)
at java.awt.Component.dispatchEventImpl(Unknown Source)
at java.awt.Container.dispatchEventImpl(Unknown Source)
at java.awt.Component.dispatchEvent(Unknown Source)
at java.awt.LightweightDispatcher.retargetMouseEvent(Unknown Source)
at java.awt.LightweightDispatcher.processMouseEvent(Unknown Source)
at java.awt.LightweightDispatcher.dispatchEvent(Unknown Source)
at java.awt.Container.dispatchEventImpl(Unknown Source)
at java.awt.Window.dispatchEventImpl(Unknown Source)
at java.awt.Component.dispatchEvent(Unknown Source)
at java.awt.EventQueue.dispatchEventImpl(Unknown Source)
at java.awt.EventQueue.access$200(Unknown Source)
at java.awt.EventQueue$3.run(Unknown Source)
at java.awt.EventQueue$3.run(Unknown Source)
at java.security.AccessController.doPrivileged(Native Method)
at java.security.ProtectionDomain$1.doIntersectionPrivilege(Unknown Source)
at java.security.ProtectionDomain$1.doIntersectionPrivilege(Unknown Source)
at java.awt.EventQueue$4.run(Unknown Source)
at java.awt.EventQueue$4.run(Unknown Source)
at java.security.AccessController.doPrivileged(Native Method)
at java.security.ProtectionDomain$1.doIntersectionPrivilege(Unknown Source)
at java.awt.EventQueue.dispatchEvent(Unknown Source)
at java.awt.EventDispatchThread.pumpOneEventForFilters(Unknown Source)
at java.awt.EventDispatchThread.pumpEventsForFilter(Unknown Source)
at java.awt.EventDispatchThread.pumpEventsForHierarchy(Unknown Source)
at java.awt.EventDispatchThread.pumpEvents(Unknown Source)
at java.awt.EventDispatchThread.pumpEvents(Unknown Source)
at java.awt.EventDispatchThread.run(Unknown Source)
In the error: line 91 is where i wrote table.setValueAt(entry.getKey(), row, 0); inside the for loop. And line 43 is where i call the method where the for loop is.
I tryed to fix it but i've solved nothing. I just saw that this error appears just when i print the HashMap with the input given from JOptionPane.showInputDialog(). If i set the HashMap key and values inside the code it works perfectly. Any idea to solve it?
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This is the code:
import java.awt.Container;
public class Main extends JFrame {
static JTable table;
static JButton viewall, add, cercanome, cercamedia, esci;
static Map<String, Integer> registro = new HashMap<String, Integer>();
public static void main(String[] args) {
JFrame f = new JFrame("Studenti");
f.setSize(557, 597);
f.setResizable(false);
f.setVisible(true);
f.setDefaultCloseOperation(JFrame.EXIT_ON_CLOSE);
f.setLocationRelativeTo(null);
components(f.getContentPane());
}
public static void components(Container pane) {
// Here i set all the components of the frame and i set up the ActionListeners for the buttons
pane.setLayout(null);
table = new JTable(registro.size(), 2);
table.setBounds(10, 11, 384, 536);
pane.add(table);
viewall = new JButton("Visualizza Tutto");
viewall.addActionListener(new ActionListener() {
public void actionPerformed(ActionEvent arg0) {
viewAll();
}
});
viewall.setBounds(404, 11, 130, 23);
pane.add(viewall);
add = new JButton("Aggiungi Alunno");
add.addActionListener(new ActionListener() {
public void actionPerformed(ActionEvent e) {
addStudent();
}
});
add.setBounds(404, 45, 130, 23);
pane.add(add);
cercanome = new JButton("Cerca per Nome");
cercanome.addActionListener(new ActionListener() {
public void actionPerformed(ActionEvent e) {
cercaNome();
}
});
cercanome.setBounds(404, 79, 130, 23);
pane.add(cercanome);
cercamedia = new JButton("Cerca per Media");
cercamedia.addActionListener(new ActionListener() {
public void actionPerformed(ActionEvent e) {
cercaMedia();
}
});
cercamedia.setBounds(404, 113, 130, 23);
pane.add(cercamedia);
esci = new JButton("Esci");
esci.addActionListener(new ActionListener() {
public void actionPerformed(ActionEvent e) {
System.exit(0);
}
});
esci.setBounds(404, 147, 130, 23);
pane.add(esci);
}
public static void viewAll() { // This is called when you press the button "viewall" to print the map.
int row = 0;
for(Map.Entry<String, Integer> entry : registro.entrySet()){
table.setValueAt(entry.getKey(), row, 0);
table.setValueAt(entry.getValue(), row, 1);
row++;
}
}
public static void addStudent() { // This is called when you click the button "add" to add elements to the map.
registro.put(
JOptionPane
.showInputDialog("Inserire Nome e Cognome del nuovo studente:"),
Integer.parseInt(JOptionPane
.showInputDialog("Inserire la Media del nuovo studente:")));
}
// These are two methods that are called pressing other two buttons. But it doesn't matter.
public static void cercaNome() {}
public static void cercaMedia() {}
}
