Thread: nested do while loop

I am very new at java and just trying to learn it on my spare time and I'm doing do-while loops and I am having trouble understanding the below code if somebody could help me out that would be great.


public class help {
public static void main (String args[])
throws java.io.IOException {
char choice, ignore;
do{
System.out.println ("Choose one:");
System.out.println("1. if");
System.out.println("2.switch");

choice = (char) System.in.read();
do{
ignore = (char) System.in.read();
}while(ignore != '\n');
}while (choice < '1'| choice >'2');

switch(choice){
case '1':
System.out.println("if");
break;
case '2':
System.out.println("switch");
break;
}
}
}

Whats the point of the block?
do{
ignore = (char) System.in.read();
}while(ignore != '\n');

It makes no difference in the program wither i delete this block or keep it

Also can somebody explain how while (choice < '1'| choice >'2'); translates? I would assume it would be while (choice >= '1'| choice =<'2');?

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