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The Java action() Method
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When the user clicks a button, the Java framework calls the applet's + method, so we add that method now: import javaawt*;
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import javaappletApplet;
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public class buttons extends Applet{
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TextField text1;
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Button button1;
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public static void main(String args[])
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public void init(){
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public boolean action (Event e, Object o){
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We are passed two arguments in + method: import javaawt*;
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import javaappletApplet;
public class buttons extends Applet{
TextField text1;
Button button1;
public static void main(String args[])
public void init(){
public boolean action (Event e, Object o){
if(etargetequals(button1)){
If the user did indeed click the button, we want to place the text + method: import javaawt*;
import javaappletApplet;
public class buttons extends Applet{
TextField text1;
Button button1;
public static void main(String args[])
public void init(){
public boolean action (Event e, Object o){
if(etargetequals(button1)){
text1setText("Welcome to XML!");
Finally, we have to return a + to indicate that we handled the interface event: import javaawt*;
import javaappletApplet;
public class buttons extends Applet{
TextField text1;
Button button1;
public static void main(String args[])
public void init(){
public boolean action (Event e, Object o){
if(etargetequals(button1)){
text1setText("Welcome to XML!");
return true;
Now the example is ready to run[md]compile and run it, as shown in Figure 14 You can see our text field and button in that figure already
Figure 14 Our buttons application When the user clicks the button, the program displays the + message, as shown in Figure 15 Our program is a success[md]now we're using Java buttons
Figure 15 Clicking the button displays our message The code for this example, buttonsjava, appears in Listing 13 Listing 13 + import javaawt*;
import javaappletApplet;
public class buttons extends Applet{
TextField text1;
Button button1;
public static void main(String args[])
buttonsFrame frame = new buttonsFrame("The buttons application");
frameresize(400, 300);
buttons applet = new buttons();
frameadd("Center", applet);
appletinit();
appletstart();
frameshow();
public void init(){
text1 = new TextField(20);
add(text1);
button1 = new Button("Click Me");
add(button1);
public boolean action (Event e, Object o){
if(etargetequals(button1)){
text1setText("Welcome to XML!");
return true;
class buttonsFrame extends Frame
public buttonsFrame(String str)
super (str);
public boolean handleEvent(Event evt)
switch (evtid)
case EventWINDOW_DESTROY:
dispose();
Systemexit(0);
return true;
default:
return superhandleEvent(evt);
Summary
That's it for our first chapter In this chapter, we've gotten an introduction to XML and learned[md]or
reviewed[md]the Java we'll need to use the available XML software (in particular, XML parsers) Let's turn to the next chapter now in which we start seeing how to put XML to work
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2 Working With XML
This is the chapter where it really begins[md]where we start dissecting XML and putting it to work for us To start, we'll work through the formal rules of XML[md]the XML grammar specification[md] in this chapter and the next one Examining the grammar of XML is crucial to creating and using XML documents Then, to actually make use of XML documents, we'll see how to use the Microsoft XML parser (written in Java) to read in XML documents, check them for validity, and parse them into their component elements After that, we'll start seeing how to make use of the data in XML documents Let's start now by working through the XML grammar specification
The XML Grammar Specification
We'll start our exploration of the XML specification with two important XML definitions: valid and well-formed XML documents Because we'll refer back to these concepts throughout this chapter, we will start by defining these two terms
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