JComboBox

[Pimon]

Ich waehle aus zwei JComboBox(en) unterschiedliche Werte aus, aber bei einer bestimmten Kombination soll ein JTextField zur weiteren Eingabe sichtbar werden.
Wie bekomme ich das hin?

 

[Thomas Darimont]

Hallo!

siehe :

import java.awt.FlowLayout;
import java.awt.event.ActionEvent;
import java.awt.event.ActionListener;
import java.awt.event.WindowAdapter;
import java.awt.event.WindowEvent;

import javax.swing.DefaultComboBoxModel;
import javax.swing.JComboBox;
import javax.swing.JFrame;
import javax.swing.JPanel;
import javax.swing.JTextField;

/**
 * @author      Darimont<br>
 * @version     1.0<br>
 * Date of creation:  08.03.2004<br>
 * File:         ComboTest.java<br>
 * Modifier:     Darimont<br>
 * Revision:     Revision<br>
 * State:        Germany<br>
 */

public class ComboTest extends JFrame{

	private JComboBox box1,box2;
	private DefaultComboBoxModel modbox1, modbox2;
	private JPanel panel;
	private JTextField textf;
	private MySelectActionListener msal;

	public ComboTest(){
		super("comboTest");
		setSize(400,300);
		
		addWindowListener(new WindowAdapter(){
			public void windowClosing(WindowEvent evt){
				setVisible(false);
				dispose();
				System.exit(0);
			}
		});
		
		
		getContentPane().setLayout(new FlowLayout());
		
		msal = new MySelectActionListener();
		
		modbox1 = new DefaultComboBoxModel();
		modbox1.addElement("BoxItem1");
		modbox1.addElement("BoxItem2");
		modbox1.addElement("BoxItem3");
		modbox1.addElement("BoxItem4");
		modbox1.addElement("BoxItem10");
		
		box1 = new JComboBox();
		box1.setModel(modbox1);
		box1.addActionListener(msal);
		
		modbox2 = new DefaultComboBoxModel();
		modbox2.addElement(new Integer(1));
		modbox2.addElement(new Integer(2));
		modbox2.addElement(new Integer(3));
		modbox2.addElement(new Integer(4));
		modbox2.addElement(new Integer(10));		
		
		box2 = new JComboBox();
		box2.setModel(modbox2);
		box2.addActionListener(msal);
		
				
		textf = new JTextField(20);
		textf.setVisible(false);
		
		getContentPane().add(box1);
		getContentPane().add(box2);
		getContentPane().add(textf);
		
		setVisible(true);
	}

	public static void main(String[] args) {
		new ComboTest();
	}
	
	class MySelectActionListener implements ActionListener{

		/* (non-Javadoc)
		 * @see java.awt.event.ActionListener#actionPerformed(java.awt.event.ActionEvent)
		 */
		public void actionPerformed(ActionEvent arg0) {
			// TODO Auto-generated method stub
			
			//wenn die beiden Comboboxen zueinader passende werte aufweisen
			//dann Textfeld anzeigen ...
			
			String valBox1 = (String)box1.getSelectedItem();
			String valBox2 = ((Integer)box2.getSelectedItem())String();
			int lenValBox1 = valBox1.length();
			int lenValBox2 = valBox2.length();
			String str = valBox1.substring(lenValBox1 - lenValBox2,lenValBox1);
			if(str.equals(valBox2)){
				textf.setVisible(true);
				validate();
			}else{
				textf.setVisible(false);
			}
			
			
			
		}
		
	}
}

Gruß Tom

 

[Pimon]

Super Danke
damits dann aber auch richtig fumktioniert, muss diese Zeile:

String valBox2 = ((Integer)box2.getSelectedItem())String();
so heissen
String valBox2 = ((Integer)box_alpha.getSelectedItem()).toString();