Can't convert java.lang.String to int?

Question

int temp=Integer.parseInt(MMdriverid);

Answer 1

try:sql="select * from driver where driverid<"+(Integer.parseInt(MMdriverid)-10)+" minus  driverid<"+(Integer.parseInt(MMdriverid)-20) ;

Answer 2

try:if (MMdriverid.equals("")){
       sql="select * from driver where rownum<11 ";
       }
  else{    
       sql="select * from driver where driverid<"+(Integer.parseInt(MMdriverid)-10)+" minus  driverid<"+(Integer.parseInt(MMdriverid)-20) ;
}