Could somebody tell me how this program works....

Hi, I am new in Java...I just bought a book and start to learn the java from that book. Here is one of the project exercise and seems that it is difficult for me to understand the flow of the program.
class HelpClassDemo {
public static void main(String args [])
throws java.io.IOException () {
char choice;
Help hlpobj = new Help;
for(;;) {
do {
hlpobj.showmenu();
do {
choice = (char) System.in.read () ;
} while (choice == '\n' | choice == '\r');
} while ( !hlpobj.isvalid (choice) );
if(choice == 'q' ) break;
System.out.println("\n");
hlpobj.helpon(choice);
Thats what the program code. I don't understand especially after the " } while( !hlpobj.isvalid(choice)); " part. And i don't know what is !hlpobj means....
Please help.....

you have already posted in "new to Java " Forum
Message was edited by:
srinivass

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class HelpClassDemo {
public static void main(String args [])
throws java.io.IOException () {
char choice;
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for(;;) {
do {
hlpobj.showmenu();
do {
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Thats what the program code. I don't understand especially after the " } while( !hlpobj.isvalid(choice)); " part. And i don't know what is !hlpobj means....
Please help.....

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Could somebody tell me how this program works....

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