Can't get this Java program to work

Okay changed the code a bit, but the program still doesn't work properly. I want to be able to enter type of product (fruit) in the java console when program is run, enter any type of fruit (bananas, apples or oranges) and then enter a qty.

import java.util.*;

public class demo {

public static void main(String args) {

Scanner sc = new Scanner(System.in);

String str = { "Bananas", "Apples", "Oranges" };
double price = { 2.09, 2.59, 2.25 };
int i = 0;
int j = 0;

System.out.print("Enter type of product: ");
String string = sc.nextLine();
if ("fruit".equals(string)) {
while (i < str.length) {
while (j < price.length) {
System.out.print(str[i++] + ": " + "£" + (price[j++]) + "p per bag n");

}
}
}
System.out.print("n");
System.out.print("Enter which type of " + string + ": ");

String string1 = sc.nextLine();

boolean strs = "bananas".equals(string1);
boolean strs1 = "apples".equals(string1);
boolean strs2 = "oranges".equals(string1);
if (strs) {
System.out.print("Enter qty of " + str[0] + " (by bag): ");
}

if (strs1) {
System.out.print("Enter qty of " + str[1] + " (by bag): ");

}
if (strs2) {
System.out.print("Enter qty of " + str[2] + " (by bag): ");
}

int qty = sc.nextInt();
int a = { 1, 2, 3, 4, 5, 6, 7, 8, 9, 10 };
int h = 1;
if ((a[h] == (qty)) && (strs) || (strs1) || (strs2)){
System.out.print("n");
System.out.print(qty + " bag(s) of " + string1 + " have been added to your basket, " + "total costing £"
+ (qty) * price[0] + "p");

}
}
}


Any more ideas?

4 Answers
4

You have mistake is Reading strings.

Replace

String string = sc.next("fruit"); // Line 17
String string1 = sc.next("bananas"); // Line 26
String string2 = sc.next("apples"); // Line 30
String string3 = sc.next("oranges"); // Line 35


With

String string = sc.nextLine(); // Line 17
String string1 = sc.nextLine(); // Line 26
String string2 = sc.nextLine(); // Line 30
String string3 = sc.nextLine(); // Line 35


If you want to check the String entered , then make use of following code:-

String

if(string.equals("fruit")){
// statements
}


Error is at String string = sc.next("fruit"); either change it to sc.nextLine() or Something like below

public static void main(String args) {

Scanner sc = new Scanner(System.in);

String str = { "Bananas", "Apples", "Oranges" };
double stk = { 1.09, 1.59, 1.25 };
int i = 0;
int j =0;

try {
System.out.print("Enter type of product: ");
String string = sc.next();

while (i < str.length) {
while (j < stk.length) {
System.out.print(str[i++] + ": " + "£" + (stk[j++]) + "p per bag n");

}
}
System.out.print("n");
System.out.print("Enter which type of "+string+": ");
String string1 = sc.next();
if(string1 != null) {
System.out.print("Enter qty of "+string1+ "(per bag) n");
}
String string2 = sc.next();
if(string2 != null) {
System.out.print("Enter qty of " +string2+ "(in lbs) n");

}
String string3 = sc.next();
if (string3 != null) {
System.out.print("Enter qty of " +string3+ "(in lbs) n");

}

} catch (Exception e) {
System.out.println("Eror");
e.printStackTrace();
}
}


Your scanning of input line is wrong.To scan input data in Java you should use

Scanner in = new Scanner(System.in);
int a = in.nextInt(); // To input integer
char ch = in.nextChar(); // To input character
String str = in.nextLine(); // To get a complete line of input
String s = in.next(); //To get a single string


Replace your inputing line according to the above given.

Cheers :)

You are getting a InputMismatchException that, according to the JavaDoc, is

InputMismatchException

thrown by a Scanner to indicate that the token retrieved does not
match the pattern for the expected type, or that the token is out of
range for the expected type.

Scanner

So if you don't write "fruit" as you requested (String string = sc.next("fruit")), the execution terminates with that exception. So, to fix your code, you should replace

"fruit"

String string = sc.next("fruit")

String string = sc.next("fruit");


with something like

String string = sc.nextLine();
if ("fruit".equalsIgnoreCase(string)) { /* design your control flow as you want */


You can apply the same rule to the other sc.next() present in your code.

sc.next()

A side note: never swallow exceptions into a catch block; always log them.

catch

if

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