the bellow code is a part of my program that is suppose to give the user the option to continue by pressing p and exiting by pressing e. anyways I keep getting this single error and I don't know what to do to fix it here is the error (I tried moving the line arround but it had no effect and if I remove it the program compiles but then it goes to an endless loop) :
C:\Users\Asus\Desktop\javaproject\products.java:112: error: cannot find symbol
user_selection = keyboard.nextLine() ;
^
symbol: variable keyboard
location: class productsDataFinder
1 error
Process completed.
and here is the code:
String user_selection = "????" ;
System.out.print("\n This program prints inventory. Please, select from"
+ "\n the following menu by typing in a letter. ") ;
while ( user_selection.charAt( 0 ) != 'e' )
{
System.out.print("\n\n p Print inventory."
+ "\n e Exit the program.\n\n " ) ;
user_selection = keyboard.nextLine() ; //error concerning this line
if ( user_selection.charAt( 0 ) == 'p' )
{
System.out.print("\n Please insert your serial number: ");
Scanner keyboard = new Scanner( System.in ) ;
int given_id = keyboard.nextInt() ;
int products_index = 0 ;
boolean table_search_ready = false ;
while ( table_search_ready == false )
{
if ( products_index >= products_table.length )
{
table_search_ready = true ;
System.out.print( "\n Sorry, no such product id "
+ given_id + ".\n" ) ;
}
else if ( products_table[ products_index ].get_id() == given_id )
{
products_table[ products_index ].print_products_data() ;
table_search_ready = true ;
}
else
{
products_index ++ ;
}
The variable keyboard hasn't been defined.
That is to say, you are using it...
user_selection = keyboard.nextLine() ;
before it is defined
Scanner keyboard = new Scanner( System.in ) ;