Im currently learning java and stuck onto JComboBox. I have a feel things that I am trying out and hitting the wall for the pass 4 hours.
I am trying to let a user select 1-10 from a ComboBox. How do I get the value of the combobox? The value of the combo box is equivalent to quantity.
So I have another value which is maybe $10. If the user choose quantity 2.
I want to get the value of what the user choose, then take the value of $10 and times it by 2.
The result which is $20 will be displayed on the JTextField.
Please help :(
public class Panel extends JPanel {
public Panel(){
JPanel test = new JPanel(new GridBagLayout());
String[] quantities1 = {"0","1","2","3","4","5","6","7","8","9","10"};
JComboBox quantitiesCB = new JComboBox(quantities1);
quantitiesCB.addActionListener(
new ActionListener(){
public void actionPerformed(ActionEvent e){
JComboBox combo = (JComboBox)e.getSource();
String currentQuantity = (String)combo.getSelectedItem();
}
}
);
JTextField result = new JTextField();
setLayout(new GridBagLayout());
setPreferredSize(new Dimension(640,480));
GridBagConstraints gbc = new GridBagConstraints();
gbc.gridx = 0;
gbc.gridy = 0;
gbc.weightx = 0.1;
gbc.weighty = 0.1;
gbc.fill = GridBagConstraints.HORIZONTAL;
gbc.anchor = GridBagConstraints.NORTH;
add(quantitiesCB, gbc);
}
}
Just few changes:
public class Panel extends JPanel {
public Panel(){
JPanel test = new JPanel(new GridBagLayout());
String value = "10";
final JTextField result = new JTextField();
String[] quantities1 = {"0","1","2","3","4","5","6","7","8","9","10"};
JComboBox quantitiesCB = new JComboBox(quantities1);
quantitiesCB.addActionListener(
new ActionListener(){
public void actionPerformed(ActionEvent e){
JComboBox combo = (JComboBox)e.getSource();
String currentQuantity = (String)combo.getSelectedItem();
int value1 = Integer.valueOf(value);
int value2 = Integer.valueOf(currentQuantity);
String resultText = String.valueOf(value1*value2);
result.setText("$" + resultText);
}
}
);
setLayout(new GridBagLayout());
setPreferredSize(new Dimension(640,480));
GridBagConstraints gbc = new GridBagConstraints();
gbc.gridx = 0;
gbc.gridy = 0;
gbc.weightx = 0.1;
gbc.weighty = 0.1;
gbc.fill = GridBagConstraints.HORIZONTAL;
gbc.anchor = GridBagConstraints.NORTH;
add(quantitiesCB, gbc);
}
}