Solution

HTML Interface to Applet

<APPLET CODEBASE="/applets/magelang/AWT-Training/classes/" CODE="ContactInfoFormTest.class" WIDTH=300 HEIGHT=150 ALIGN=CENTER></APPLET>

Java Code

import java.applet.*;
import java.awt.*;

public class ContactInfoFormTest extends Applet {
	public void init() {
		add(new ContactInfoForm());
	}
}

class ContactInfoForm extends FormElement {
    int n=4; // how many fields in the form?
    FormElement[] fields = new FormElement[n];
    
    public ContactInfoForm() {
        setLayout(new GridLayout(0,1,10,10));
        int i=0;
        fields[i++] = new LabeledTextField("Name");
        fields[i++] = new PhoneTextField();
        fields[i++] = new EMailTextField();
        fields[i++] = new LabeledChoice("Payment Method");
        for (i=0; i<n; i++) {
            add(fields[i]);
        }
    }
    
    public Dimension preferredSize() {
        return new Dimension(300,n*30);
    }
    
    public String getContents() {
        String contents="";
        for (int i=0; i<n; i++) {
            contents += fields[i].getContents();
            if ( i<n-1 ) contents += "\n";
        }
        return contents;
    }
    
    // if any field is empty, say that the form is empty
    public boolean isEmpty() {
        for (int i=0; i<n; i++) {
            if ( fields[i].isEmpty() ) return true;
        }
        return false;
    }
    
    // verify each field
    public void verify() {
        for (int i=0; i<n; i++) {
            fields[i].verify();
        }
    }
}