Welcome to Study Global Keychain Program in java by Indranil Bhattacharjee. Keychain a shop import java . util . Scanner ; class Key_chain { public static void main ( String [] args ) { System . out . println ( "\nYe Olde Keychain Shope" ); while ( true ){ System . out . println ( "1. Add Keychains to Order" ); System . out . println ( "2. Remove Keychains from Order " ); System . out . println ( "3. View Current Order" ); System . out . println ( "4. Checkout \n " ); System . out . print ( "Please enter your choice:" ); Scanner sc = new Scanner ( System . in ); ...