import java.io.*;
public class ManyTickets
{
public static void main (String [] args) throws IOException
{
String userInput;
String userInput2;
int intInput = 0;
int intInput2 = 0;
double total = 0.00;
//(1) BufferedReader ageInput = new BufferedReader (new InputStreamReader (System.in));
Question 1: Above line works fine (1) when we change it into other place which i marked as (2). // but while executing "Please enter your age"line comes first though i create bufferedreader object before that statement in case (1).I expect compiler should wait for user input but it prints the statement. Though i create ageInput before try.
try{
System.out.println("Please enter your age, or press '999' to exit.");
//(2) BufferedReader ageInput = new BufferedReader (new InputStreamReader (System.in));
userInput = ageInput.readLine();
intInput = Integer.parseInt (userInput);
while (intInput != 999)
//Question2:While executing by 999 if i type 999 without giving space it is execute it gives some output but not exit.how to avoid whitespaces in the beginning like whatever i am giving whether 999 or 999 or999 i need same output.I need exit but not for input like 99 9; I need method to avoid whitespaces in the input(beginning).
{
if (intInput < 0 || intInput > 110)
System.out.println("Invalid entry, or your age seems a bit too high to enter buy
tickets);
else if (intInput <= 12)
{
total = total + 6;
System.out.println("The ticket cost for 1 ticket is " + total);
}
else if (intInput <= 64)
{
total = total + 11;
System.out.println("The ticket cost for 1 ticket is " + total);
}
else
{
total = total + 8;
System.out.println("The ticket cost for 1 ticket is $" + total);
}
System.out.println("So far, your tickets cost is: $" + total );
System.out.print("Would you like to buy more tickets? You can buy up to 1 more ticket per customer! If no press 999to exit");
userInput = ageInput.readLine();
intInput2 = Integer.parseInt (userInput);
}
}catch (NumberFormatException e){
System.out.println("Please restart the program, and enter an integer instead!");
}
}
{
double total = 0.0;
System.out.println("Thank you, The total cost for the ticket is: $" + total);
System.out.println("Have a nice day!");
}
}
Simply use Trim function to remove spaces before and after a input
ageInput.readLine().trim()
This is the definition of trim()
method
public String trim() {
int len = value.length;
int st = 0;
char[] val = value; /* avoid getfield opcode */
while ((st < len) && (val[st] <= ' ')) {
st++;
}
while ((st < len) && (val[len - 1] <= ' ')) {
len--;
}
return ((st > 0) || (len < value.length)) ? substring(st, len) : this;
}
if you only want to remove first part remove second one
while ((st < len) && (val[len - 1] <= ' ')) {
len--;
}
For Question 2 readline()
is responsible for get the input. you can create buffered
reader
object anywhere before readline
Question2:While executing by 999 if i type 999 without giving space it is execute it gives some output.how to avoid whitespaces in the beginning like whatever i am giving whether 999 or 999 i need same output. I need method to avoid whitespaces in the input.
To avoid white spaces simply remove them from strings like following:
userInput = ageInput.readLine().replaceAll(" ","");
intInput = Integer.parseInt (userInput);
Question 1: Above line works fine (1) when we change it into other place which i marked as (2). // but while executing "Please enter your age"line comes first though i create bufferedreader object before that statement in case (1).I expect compiler should wait for user input but it prints the statement. Though i create ageInput before try.
This is too ambiguous.
Answer #1:
You are asking for user input after line 2 ie after print statement and hence it wait's after asking the question. If you move statement userInput = ageInput.readLine();
before print statement (keeping Buffered reader's instantiation at line 1) then it will wait for user input and then will print the statement.
Answer #2:
You could use String's trim()
method as below:
userInput = ageInput.readLine().trim();
If you need user defined function (which i would avoid), you could do something like:
public String myStringTrimmer() {
int len = value.length;
int st = 0;
char[] val = userInput.toCharArray();
while ((st < len) && (val[st] <= ' ')) {
st++;
}
while ((st < len) && (val[len - 1] <= ' ')) {
len--;
}
return ((st > 0) || (len < value.length)) ? userInput.substring(st, len) : userInput;
}
The technical post webpages of this site follow the CC BY-SA 4.0 protocol. If you need to reprint, please indicate the site URL or the original address.Any question please contact:yoyou2525@163.com.