package awt;
import java.awt.*;
import java.awt.event.*;
//import java.awt.event.WindowListener;
public class AppliGridLayout extends Frame
implements WindowListener
{
    public AppliGridLayout() {
        super("AppliGridLayout");
        this.setLayout(new GridLayout(3,2));
        for (int i = 1; i < 7; i++)
            this.add(new Button(Integer.toString(i)));
        this.pack();
        this.setVisible(true);
        this.addWindowListener(this);
}
public static void main(String args[]) {
        AppliGridLayout appli = new AppliGridLayout();
    }
public void windowClosing(WindowEvent e) {
System.exit(0);

    }
}

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import java.awt.*;
import java.awt.event.*;
public class EssaiActionEvent2 extends Frame
implements ActionListener {
    private Button b1,b2;
    public static void main(String args[])  {
        EssaiActionEvent2 f= new EssaiActionEvent2();
}
public EssaiActionEvent2(){
    super("Utilisation d’un ActionEvent");
    b1 = new Button("action1");
    b2 = new Button("action2");
    b1.addActionListener(this);
    b2.addActionListener(this);
    this.add(BorderLayout.CENTER,b1);
    this.add(BorderLayout.SOUTH,b2);
    this.pack();
    this.setVisible(true);
}
public void actionPerformed( ActionEvent e ) {
        if (e.getSource() == b1) setTitle("action1 cliqué");
        if (e.getSource() == b2) setTitle("action2 cliqué");
    }
}


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package awt;

import java.awt.Button;
import java.util.StringTokenizer;

public class MaCalculatrice extends Frame implements ActionListener {

    Button b1,b2;
    Label l;
    TextField tf;

    public MaCalculatrice() {
        super("Calculatrice");
        this.setLayout(new GridLayout(4,1));
        l=new Label("operation");
        tf = new TextField();
        b1 = new Button("Calculer");
        b2 = new Button("Effacer");
        b1.addActionListener(this);
        b2.addActionListener(this);
        this.add(1);
        this.add(tf)
    }
}


public void actionPerformed(ActionEvent e) {
    if (e.getSource() == b2)
        tf.setText("");
    else {
        String ch = tf.getText();
        String sa,sb;
        if (ch.contains("+")) {
            StringTokenizer st = new StringTokenizer(ch, "+");
            sa=st.nextToken();
            sb=st.nextToken();
        }
    }
}