Remplir un TextField en Fonction D'une ComboBox

import java.awt.Dimension;
import java.awt.event.ActionEvent;
import java.awt.event.ActionListener;

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

public class Test extends JFrame implements ActionListener {
	private JComboBox			comboBox			= null;
	private JTextField			textField			= null;

	public static void main(final String[] args) {
		new Test().setVisible(true);
	}

	public Test() {
		final JPanel panel = new JPanel();
		panel.add(getComboBox());
		panel.add(getTextField());
		setContentPane(panel);
		getComboBox().setSelectedIndex(0);// pas oblige
		setDefaultCloseOperation(3);
		pack();
		setLocationRelativeTo(null);
	}

	private JComboBox getComboBox() {
		if (comboBox == null) {
			comboBox = new JComboBox();
			final DefaultComboBoxModel model = new DefaultComboBoxModel();
			for (int i = 1; i < 11; ++i)
				model.addElement("Item " + i);
			comboBox.setModel(model);
			comboBox.setPreferredSize(new Dimension(150, 20));
			comboBox.addActionListener(this);
		}
		return comboBox;
	}

	private JTextField getTextField() {
		if (textField == null) {
			textField = new JTextField();
			textField.setPreferredSize(new Dimension(150, 20));
		}
		return textField;
	}
	
	private void fillTextField(String value) {
		// cas 1
		getTextField().setText(value);
		// cas 2
		//recherche dans la db de la donnée que tu veux
		//......
	}

	public void actionPerformed(final ActionEvent e) {
		final Object o = e.getSource();
		if (o.equals(getComboBox())) {
			fillTextField("" + getComboBox().getSelectedItem());
		}
	}
}

import java.awt.BorderLayout;
import javax.swing.JPanel;
import javax.swing.JFrame;
import java.awt.Dimension;
import javax.swing.JDesktopPane;
import java.awt.Color;
import java.awt.SystemColor;
import javax.swing.JComboBox;
import java.awt.Rectangle;
import javax.swing.JLabel;
import javax.swing.JOptionPane;
import javax.swing.JTextField;
import javax.swing.JButton;
import java.awt.Font;
import java.awt.event.ActionEvent;
import java.awt.event.ActionListener;
import java.awt.event.MouseEvent;
import java.sql.ResultSet;
import java.sql.ResultSetMetaData;
import java.sql.SQLException;
import java.sql.Statement;
import java.util.Vector;
import javax.swing.JTextPane;
import javax.swing.JScrollBar;
import javax.swing.JScrollPane;
import javax.swing.JTable;
import javax.swing.JProgressBar;
import javax.swing.table.DefaultTableModel;

public class ModifierMat extends JFrame {

	
	private static final long serialVersionUID = 1L;
	private ResultSet rs;
	private ResultSetMetaData rm;
	private DefaultTableModel model;
	private JPanel jContentPane = null;
	private static Statement st;  //  @jve:decl-index=0:
	private static JFrame jFrame;
	private JDesktopPane jDesktopPane = null;
	private static JComboBox jc = null;
	private JLabel NumSerie_l = null;
	private JLabel DateInstallation_l = null;
	private JLabel Marque_l = null;
	private JLabel Etat_l = null;
	private JLabel Type_l = null;
	private static JTextField DateInstallation_t = null;
	private JButton quitter = null;
	private JButton Modifier = null;
	private JLabel Titre = null;
	private static JComboBox jc2 = null;
	private static JComboBox jc1 = null;
	private static JComboBox jc3 = null;
	private JTextField t1 = null;
	private JTextField t2 = null;
	private JTextField t3 = null;
	/**
	 * This is the default constructor
	 */
	public ModifierMat() {
		super();
		initialize();
	}

	/**
	 * This method initializes this
	 * 
	 * @return void
	 */
	private void initialize() {
		this.setSize(751, 486);
		this.setContentPane(getJContentPane());
		this.setTitle("Modifier Materiel");
		this.setDefaultCloseOperation(EXIT_ON_CLOSE);
	}

	/**
	 * This method initializes jContentPane
	 * 
	 * @return javax.swing.JPanel
	 */
	private JPanel getJContentPane() {
		if (jContentPane == null) {
			jContentPane = new JPanel();
			jContentPane.setLayout(new BorderLayout());
			jContentPane.add(getJDesktopPane(), BorderLayout.CENTER);
		}
		return jContentPane;
	}

	
	/**
	 * This method initializes jDesktopPane	
	 * 	
	 * @return javax.swing.JDesktopPane	
	 */
	private JDesktopPane getJDesktopPane() {
		if (jDesktopPane == null) {
			Titre = new JLabel();
			Titre.setBounds(new Rectangle(122, 40, 301, 47));
			Titre.setFont(new Font("Footlight MT Light", Font.BOLD, 30));
			Titre.setForeground(Color.white);
			Titre.setText("  Modifier Materiel");
			Type_l = new JLabel();
			Type_l.setBounds(new Rectangle(29, 271, 172, 36));
			Type_l.setFont(new Font("Comic Sans MS", Font.BOLD, 18));
			Type_l.setForeground(SystemColor.controlHighlight);
			Type_l.setText(" Type Du Materiel");
			Marque_l = new JLabel();
			Marque_l.setBounds(new Rectangle(30, 315, 199, 34));
			Marque_l.setFont(new Font("Comic Sans MS", Font.BOLD, 18));
			Marque_l.setForeground(SystemColor.controlHighlight);
			Marque_l.setText(" Marque  Du Materiel");
			Etat_l = new JLabel();
			Etat_l.setBounds(new Rectangle(30, 223, 173, 36));
			Etat_l.setFont(new Font("Comic Sans MS", Font.BOLD, 18));
			Etat_l.setForeground(SystemColor.controlHighlight);
			Etat_l.setText(" Etat Du Materiel ");
			DateInstallation_l = new JLabel();
			DateInstallation_l.setBounds(new Rectangle(30, 167, 173, 30));
			DateInstallation_l.setFont(new Font("Comic Sans MS", Font.BOLD, 18));
			DateInstallation_l.setForeground(SystemColor.controlHighlight);
			DateInstallation_l.setText(" Date d'Installation");
			NumSerie_l = new JLabel();
			NumSerie_l.setBounds(new Rectangle(30, 121, 175, 30));
			NumSerie_l.setFont(new Font("Comic Sans MS", Font.BOLD, 18));
			NumSerie_l.setForeground(SystemColor.controlHighlight);
			NumSerie_l.setText(" Numéro De Serie");
			jDesktopPane = new JDesktopPane();
			jDesktopPane.setForeground(SystemColor.controlHighlight);
			jDesktopPane.setBackground(SystemColor.activeCaption);
			jDesktopPane.setFont(new Font("Comic Sans MS", Font.BOLD, 18));
			jDesktopPane.add(getJc(), null);
			jDesktopPane.add(NumSerie_l, null);
			jDesktopPane.add(DateInstallation_l, null);
			jDesktopPane.add(Etat_l, null);
			jDesktopPane.add(Marque_l, null);
			jDesktopPane.add(Type_l, null);
			jDesktopPane.add(getDateInstallation_t(), null);
			jDesktopPane.add(getQuitter(), null);
			jDesktopPane.add(getModifier(), null);
			jDesktopPane.add(Titre, null);
			jDesktopPane.add(getJc2(), null);
			jDesktopPane.add(getJc1(), null);
			jDesktopPane.add(getJc3(), null);
			jDesktopPane.add(getT1(), null);
			jDesktopPane.add(getT2(), null);
			jDesktopPane.add(getT3(), null);
		}
		return jDesktopPane;
	}
	
	/*
	------ Method de remplissage du jComboBox NumSerie -----*/ 

	public void remplir_JCombo(){
		 try {
			String s="select NumSerie from Materiel";
			Statement st=Accueil.con.createStatement();
			ResultSet rst=st.executeQuery(s);


			while(rst.next()){
				jc.addItem( rst.getObject(1));
			}

			
		} catch (SQLException e) {
			// TODO Bloc catch auto-généré
			e.printStackTrace();
		}
		 
	}
	
	/*
	------ Method de remplissage du jComboBox Etat -------*/ 

	public void remplir_JComboEtat(){
		 try {
			String s="select RefEtat from EtatMateriel";
			Statement st=Accueil.con.createStatement();
			ResultSet rst=st.executeQuery(s);


			while(rst.next()){
				jc1.addItem( rst.getObject(1));
			}

			
		} catch (SQLException e) {
			// TODO Bloc catch auto-généré
			e.printStackTrace();
		}
		 
	}
	
	
	/*---- Method de remplissage du jComboBox Type ----*/ 

	public void remplir_JComboType(){
		 try {
			String s="select RefType from TypeMateriel";
			Statement st=Accueil.con.createStatement();
			ResultSet rst=st.executeQuery(s);


			while(rst.next()){
				jc2.addItem( rst.getObject(1));
			}

			
		} catch (SQLException e) {
			// TODO Bloc catch auto-généré
			e.printStackTrace();
		}
		 
	}
	
	/*---- Method de remplissage du jComboBox Marque ----*/ 

	public void remplir_JComboMarque(){
		 try {
			String s="select RefMarque from Marque";
			Statement st=Accueil.con.createStatement();
			ResultSet rst=st.executeQuery(s);


			while(rst.next()){
				jc3.addItem( rst.getObject(1));
			}

			
		} catch (SQLException e) {
			// TODO Bloc catch auto-généré
			e.printStackTrace();
		}
		 
	}
	
	
	/*------ Methode de Remplissage JTextField t1 ------*/
	public static void remplir_t1(){
		 
		try {
			if(jc1.getSelectedItem().toString()!=null){
			String s="select libelle from EtatMateriel where RefEtat='"+(String)jc1.getSelectedItem()+"'";
			Statement st=Accueil.con.createStatement();
			ResultSet rst=st.executeQuery(s);
			
					
			
			}
		} catch (SQLException e) {
			e.printStackTrace();
		}
	}
	
	
	/*------Remplir ComboBox Numeros de series du Materiel -----*/
		
	private JComboBox getJc() {
		if (jc == null) {
			jc = new JComboBox();
			jc.setBounds(new Rectangle(288, 120, 235, 28));
			remplir_JCombo();
			add(jc);
					}
		return jc;
	}

	/**
	 * This method initializes Nom_t	
	 * 	
	 * @return javax.swing.JTextField	
	 */
	private JTextField getDateInstallation_t() {
		if (DateInstallation_t == null) {
			DateInstallation_t = new JTextField();
			DateInstallation_t.setBounds(new Rectangle(288, 171, 236, 28));
		}
		return DateInstallation_t;
	}
/*-------------  Modifier Materiel  -----------*/
	
	public static void ModifMat(){
		 
		try {
			
			st=Accueil.con.createStatement();
			st.executeUpdate("update Materiel set DateInstallation='"+DateInstallation_t.getText()+"' ,RefEtat='"+jc1.getSelectedItem()+"' ,RefType='"+ jc2.getSelectedItem()+"' ,RefMarque='"+jc3.getSelectedItem()+"'  where NumSerie='"+jc.getSelectedItem().toString()+"'");
			JOptionPane.showMessageDialog(jFrame, "Modification avec succés","Confirmation", JOptionPane.INFORMATION_MESSAGE, null);
			st.close();
			
		} catch (SQLException e) {
			e.printStackTrace();
		}
	}
	
	
	/**
	 * This method initializes Modifier	
	 * 	
	 * @return javax.swing.JButton	
	 */
	public static void mouseClicked(MouseEvent event) {
	    System.out.println("mouse clicked");
	    }
	
	private JButton getModifier() {
		if (Modifier == null) {
			Modifier = new JButton();
			Modifier.setBounds(new Rectangle(396, 378, 97, 28));
			Modifier.setForeground(SystemColor.activeCaption);
			Modifier.setFont(new Font("Dialog", Font.BOLD, 14));
			Modifier.setText("Modifier");
			Modifier.addActionListener(new java.awt.event.ActionListener() {
				public void actionPerformed(java.awt.event.ActionEvent e) {
					ModifMat();
				}
			});
		}
		return Modifier;
	}

	/**
	 * This method initializes jc2	
	 * 	
	 * @return javax.swing.JComboBox	
	 */
	private JComboBox getJc2() {
		if (jc2 == null) {
			jc2 = new JComboBox();
			jc2.setBounds(new Rectangle(287, 269, 100, 28));
			remplir_JComboType();
			add(jc2);
		
		}
		return jc2;
	}

	/**
	 * This method initializes jc1	
	 * 	
	 * @return javax.swing.JComboBox	
	 */
	private JComboBox getJc1() {
		if (jc1 == null) {
			jc1 = new JComboBox();
			jc1.setBounds(new Rectangle(287, 222, 99, 29));
			remplir_JComboEtat();
			add(jc1);
			
					
		}
		return jc1;
	}

	/**
	 * This method initializes jc3	
	 * 	
	 * @return javax.swing.JComboBox	
	 */
	private JComboBox getJc3() {
		if (jc3 == null) {
			jc3 = new JComboBox();
			jc3.setBounds(new Rectangle(287, 316, 98, 27));
			remplir_JComboMarque();
			add(jc3);
		
		}
		return jc3;
	}

	/**
	 * This method initializes t1	
	 * 	
	 * @return javax.swing.JTextField	
	 */
	private JTextField getT1() {
		if (t1 == null) {
			t1 = new JTextField();
			t1.setBounds(new Rectangle(388, 224, 136, 26));
						t1.addActionListener(new java.awt.event.ActionListener() {
				public void actionPerformed(java.awt.event.ActionEvent e) {
					remplir_t1();
					add(t1);
				}
			});
		}
			
		return t1;
	}
	
	private void fillTextField(String value) {
		getT1().setText(value);
		
	}
	
	
	public void actionPerformed(final ActionEvent e) {
		final Object o = e.getSource();
		if (o.equals(getJc1())) {
			fillTextField("" + getJc1().getSelectedItem());
		}
	}
	
	

	/**
	 * This method initializes t2	
	 * 	
	 * @return javax.swing.JTextField	
	 */
	private JTextField getT2() {
		if (t2 == null) {
			t2 = new JTextField();
			t2.setBounds(new Rectangle(388, 270, 136, 27));
		}
		return t2;
	}

	/**
	 * This method initializes t3	
	 * 	
	 * @return javax.swing.JTextField	
	 */
	private JTextField getT3() {
		if (t3 == null) {
			t3 = new JTextField();
			t3.setBounds(new Rectangle(386, 315, 138, 27));
		}
		return t3;
	}

/**
 * This method initializes quitter	
 * 	
 * @return javax.swing.JButton	
	 */
	private JButton getQuitter() {
		if (quitter == null) {
			quitter = new JButton();
			quitter.setBounds(new Rectangle(493, 378, 88, 28));
			quitter.setForeground(SystemColor.activeCaption);
			quitter.setFont(new Font("Dialog", Font.BOLD, 14));
			quitter.setText("Quitter");
			quitter.addActionListener(new java.awt.event.ActionListener() {
				public void actionPerformed(java.awt.event.ActionEvent e) {
					mouseClicked(null);
					dispose();
				}
			});
		}
		return quitter;
	}
}