String operator = readOperator(); if( operator.trim().length() == 0 )
String operator = readOperator(); if( operator.trim().length() == 0 )
String operator = readOperator(); if( operator.trim().length() == 0 )
String operator = readOperator(); if( operator.trim().length() == 0 )
String operator = readOperator(); if( operator.trim().length() == 0 )
String operator = readOperator(); if( operator.trim().length() == 0 )