How To Check Input Is Integer In Java
Dec 18, 2014
I have to ask how many children's tickets you want to order. When I apply the code below, it just accepts whatever I input, including letters. I imagine it is to do with setting childrensTickets = 0? If I input a letter using the below it accepts - shouldn't it print the error given the input is not >=0?
System.out.print("How many children's tickets do you require? ");
int childrensTickets = 0;
boolean validChildrenValue = false;
while (validChildrenValue == false) {
if(aScanner.hasNextInt()) {
[Code] ....
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Dec 18, 2014
System.out.print("To begin, please enter 1 to choose stand tickets or 2 to choose terrace tickets for your party. ");
int standOrTerraceTickets = aScanner.nextInt();
while (standOrTerraceTickets != 1 && standOrTerraceTickets != 2)
{
System.out.print("Invalid input. Please enter 1 for stand tickets or 2 for terrace tickets. ");
standOrTerraceTickets = aScanner.nextInt();
}
Okay I thought I had this working properly so that when the user entered anything other than 1 or 2 they would keep getting an error invalid input, however, that only works when the user enters an integer. If the user enters anything other than a number, the program crashes. How does one prevent this from happening?
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Apr 13, 2014
Write a program that prompts the user for an input number and checks to see if that input number is greater than zero. If the input number is greater than 0, the program does a multiplication of all the numbers up to the input number starting with the input number. For example if the user inputs the number 9, then the program displays the following sum:
9 * 8 * 7 * 6 * 5 * 4 * 3 * 2 * 1 = 362880
That's the question I'm getting and so far all I've got is
import java.util.Scanner;
public class Lab4Q3
{
public static void main (String[] args)
{
int keyboard;
[Code] .....
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Aug 1, 2011
Write a Java program that reads a positive, non-zero integer as input and checks if the integer is deficient, perfect, or abundant.
A positive, non-zero integer, N, is said to be perfect if the sum of its positive proper divisors (i.e., the positive integers, other than N itself, that divide N exactly) is equal to the number itself. If this sum is less than N, the number is said to be deficient. If the sum is greater than N, the number is said to be abundant.For example, the number 6 is perfect, since 6 = 1 + 2 + 3, the number 8 is deficient, since 8 > 1 + 2 + 4, while the number 12 is abundant, since 12 < 1 + 2 + 3 + 4 + 6.
SAMPLE OUTPUT:
1.)Input N: 5
5 is deficient.
2.)Input N: 6
6 is perfect.
3.)Input N: 18
18 is abundant.
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Nov 29, 2014
We were given the assignment to program a lotto game. in our game we should do follow the following steps below, and we are supposed to use atleast tree methods. the first one to receive the array of integers and an integer and check if the int was not entered before. the user should not repeat the same number. the other method will draw all numbers of a game (quantity of numbers to draw is based on the number parameter) and returns them in an array. the last method will display the result of the game. It receives a list of all lines played and a list of all numbers draw.
these are the steps to follow:
1. Ask the user how many lines (games) the user would like to play. Each line is made of five numbers between 1 and 45 (inclusive).
2. Ask the user to enter five numbers between 1 and 45 (inclusive) for each line. The user must NOT be allowed to enter a number more than once for each line.
3. When all the numbers for all the lines are entered, the program should display all lines and asks the user to confirm the game. If the user does NOT confirm the game, the program should start all over again.
4. Draw (generate) five numbers between 1 and 45 (inclusive). The numbers should be unique within the draw.
5. Draw (generate) one number (the bonus number) between 1 and 45 (inclusive). The number should be unique within the draw.
6. Display all the lines played and the result of each line.
7. Ask the user if the person would like to play again, if so the program should start the process all over again.
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Dec 16, 2014
My program here asks for an unit to choose from (fl.oz, gal, oz, lb, in, ft, or mi), asks how much of it they have, and asks for the unit they wish to convert to (mL, l, g, kg, mm, cm, m, or km).
My program works, refusing to convert from silly conversions such as gal to cm, telling you to re-input if they enter anything other than fl.oz, gal, etc.
The only thing I cannot figure out is if the user inputs something like "foo" when the program prompts the user for how much of the unit they have. My goal is to have the program say something like "That is not a number! Please enter a numerical value."
My current dilemma right now is that if the user inputs something other than a number, it will catch the exception and print a line telling the user it's not a number, except, it does it infinitely (stuck in a loop). Here is my code:
import java.util.InputMismatchException;
import java.util.Scanner;
public class UnitConversions {
public static void main(String[] args) {
Scanner s = new Scanner(System.in);
double result = 0;
[Code] ....
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Apr 22, 2015
Is it possible to wait for an input for a user and check in the meantime if something else is true?
Now if the server in the meantime says: there is no input needed and tells it the client.
Could the client now somehow change from
input.readLine() to another Method say: quit() ?
I am stuck there because I know the server sends: quit to the client1 but the client2 cannot react because it still waits for an input for the user.
Maybe something with Thread.sleep ?
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Aug 26, 2014
The code for my button is below - I know it is wrong and that I need to change line 8 at least,so I am technically asking the property object if there is a key_name there but I dont quite get how to do that
//code for button
JButton btnSearch = new JButton("Search");
btnSearch.addActionListener(new ActionListener() {
public void actionPerformed(ActionEvent e) {
//find selected command
String key_name = textFieldSearch.getText();
[Code] ....
I basically just want the user typed in word to be checked against a keyword in a proeprties file and if it exists, pull the key and the value back into a panel ....
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Dec 19, 2013
The project is to develop the game Translate the Word .... It is asking user to translate a word proposed to and check if the input response is correct. At the end of the game score will be calculated and displayed.
Game Play :
1 - Ask the user to specify , through the console , its name and the number of words to offer . It is up to you to handle exceptions (eg number of words greater than the number you provided )
2 - Recover user response ( the word translated ) and check whether to continue . (eg you want to continue (y / n)) after each proposal.
3 - compare the response of the user with that which is preset for the word in question .
4 - Show the score at the end ( or at the breakpoint ) .
5 - Save the file in a user name , the score , the number of questions and the start date and end of the game played .
Some notes to consider :
1 - The language (eg, English - French , English - Arabic , etc. . ): It is up to you to specify the language adopted in the game and inform the user of your choice.
2 - The word bank to offer : It is up to you to develop the appropriate means to get the words to propose to the user. That said , the words and their translations can be retrieved :
a. a TXT file
b . an XML file . ( Tutorials DOM and SAX )
c . CSV file ( OpenCSV Tutorial )
d. a database ( Tutorial Access)
e . through APIs (eg Wordnet and google translate etc . ) .
f . a combination of the previous options a, bc , d and / or e . (eg words stored in a txt file and answers retrieved from the api google translate)
g . etc. .
Examples of files and databases are attached to the project statement . You will need to add one or more external libraries to your project. Click here for details on adding external libraries to Netbeans .
3 - A user will be associated with the question score if he can translate the word correctly. The score for each question can be calculated based on the number of words / questions to be proposed .
Development : In this project you will need at least a class called Question to encapsulate the word and its translations and provide all necessary methods to manipulate the object type Question.
An interface called IParser to make extensible project. Any class that implements IParser is a parser file (XML , TXT , CSV , etc.). / Database. In your project there will be a single class that implements IParser and will be used to retrieve words and their translations.
Add the ability to store the questions and answers of the user on the hard disk. Make the class Serializable Question
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Apr 15, 2015
I decided to code this quiz I took in class about asking the user to input a string and the code is suppose to check for upper case letters. If a upper case letter is found, it should increase a count by one. Once the check is done, it should display the number of uppercase letters. For some reason I am getting this weird compile error stating that symbols can't be found...
Java Code:
import java.util.*;
import java.lang.*;
public class StringCheck{
public static void main(String[] args){
Scanner input = new Scanner(System.in);
System.out.println("please enter a string: " );
String s = input.nextLine();
[Code] ......
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Jul 21, 2014
I have a program in which I take some characters input from User
using
String inputString=in.next();
How can i restrict user that input should be only char 0 or 1?
If the answer is regular expressions then What Should be Its Regular expressions?
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Jul 5, 2014
I have a GUI with a JTextField. I need to check that the input entered by the user is made up of only integers.
For example I accept: 1, 10, 530, ...
I do not accept: -10, 1.5, -6 ...
I would like to implement this control by using a regular expression so I would have a code like that.
JTextField text = new JTextField();
String input = text.getText();
boolean bool = checkInteger(input);
if(bool)
System.out.println("Ok");
else
System.out.println("Error");
The checkInteger(String input) method should check if the input string is correct or not.
How can I do to implement this control with regular expressions?
Is there an easier way to do it?
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Jun 12, 2014
So I clipped this out of my Jeopardy game code and made it into its own project for testing. using this code I want to check to see if the input for wage is an integer?
import java.util.Scanner;
public class test {
/**
* @param args
*/
public static void main(String[] args)
{
Scanner input = new Scanner (System.in);
Obviously right now if you enter "aflwkj" or some such for the wager, the program terminates. How to make a loop that will keep asking the user for a value for wage until the input is an integer?
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Apr 14, 2014
This program is supposed to accept an integer as an input and display the message that the number is even or odd. The main method calls a Boolean method. Write a method private static boolean iseven(int number and the message is printed from the Main method. This is what I have.
import java.util.Scanner;
public class OddorEven {
int number;
public static void main(String[] args) {
Scanner input = new Scanner(System.in);
[Code] ....
I know the message is not being printed from the Main method. I'm not sure how to do that.
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Sep 7, 2014
I am new to java and programming in general. I figured out how to convert an integer input to binary however I am having issues doing the opposite of converting a user input binary number to a decimal.
I need to do this with basic math (or string depending on how I represent the binary) and no functions.
I know how to convert binary to integer on paper but I am having a hard time working it out in java.
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Feb 8, 2014
I want to limit the program to only accept a 12 digit input and an integer value but I don't know how to program it,
import java.util.Scanner;
public class testing4
{
public static void main(String []args) {
Scanner reader = new Scanner(System.in);
String input;
[Code]...
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Apr 21, 2015
I have to write a program that inputs a 5 digit integer from the keyboard and prints if the input number is a palindrome or not. I got it to work, but when my result prints it says "0 is a palindrome" or "0 is not a palindrome". How can I get rid of the 0 and replace it with the number input by the user?
import java.util.Scanner;
public class Palindrome {
public static void main(String[] args) {
int number;
int digit;
int temp;
[code]....
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Jan 28, 2015
I am attempting to write a program that accepts input of a positive integer, reports each digit and then the sum of all digits. This is what I have so far:
*/
package numbersum;
import java.util.*;
public class Week4NumberSum {
static Scanner console = new Scanner(System.in);
/**
* @param args the command line arguments
[Code]...
It works if I enter 1234567891 (10 digits)
Enter a positive integer: 1234567891
digit: 1
digit: 2
digit: 3
digit: 4
digit: 5
digit: 6
digit: 7
digit: 8
digit: 9
digit: 1
The sum of the digits is 46
But if I enter 11 digits, it fails:
Enter a positive integer: 123456789123 (12)
Exception in thread "main" java.util.InputMismatchException: For input string: "123456789123"
at java.util.Scanner.nextInt(Scanner.java:2123)
at java.util.Scanner.nextInt(Scanner.java:2076)
at week4numbersum.Week4NumberSum.main(Week4NumberSum. java:26)
java - Scanner error with nextInt() - Stack Overflow gives me some infor for InputMismatchException - which I find described as In order to deal with this exception you must verify that the input data of your application meet its specification. When this error is thrown, the format of the input data is incorrect and thus, you must fix it, in order for your application to proceed its execution.
I don't understand why the 10 digit integer is OK but the 11 or > digit integer is a mismatch.
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Mar 18, 2015
I am trying to create a program that first asks the user for an input in the form: condition = value, where condition is a word from the set {limit, deficient, abundant, perfect, prime}, and value is a positive integer. Then it verifies the input. If the input is invalid it prints a message indicating that and terminates. If the input is valid it prints a table with the number of abundant, deficient, perfect and prime numbers less than or equal to N, where N = 1, 2, 3, ..., limit.
My problem is with the input validation. i want it to read the value as a string and verify if it's integer.
Here is my code
import java.util.Scanner;
public class Factors
{
public static void main (String[] args)
{
Scanner scan = new Scanner(System.in);
int n, f, fsum, p=0, a=0, d=0,pe=0,limit=0,abundant=0, deficient=0;
System.out.print("Enter stoping condition (condition = value): ");
String cond = scan.next();
[Code] ....
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Apr 22, 2015
a. Write a Java program to input 10 integer numbers into an array named fmax and determine the maximum value entered. Your program should contain only one loop, and the maximum should be determined as array element values are being input. (Hint: Set the maximum equal to the first array element, which should be input before the loop used to input the remaining array values.)
b. Repeat 1a, keeping track of both the maximum element in the array and the index number for the maximum. After displaying the numbers, display these two messages:
The maximum value is: _________
This is element number __________ in the list of numbers
Have your program display the correct values in place of the underlines in the messages.
c. Repeat 1b, but have your program locate the minimum value of the data entered.
I did parts a and b but for part see i just want to know if i did it correctly or not
import java.util.Scanner;
public class MinimumValueArray {
public static void main(String[] args) {
//Variable Declaration
Scanner keyboard = new Scanner(System.in);
int size = 10;
[Code] ,.....
When I run it i get this The minimum value is 0.0
The element that holds the value is 0 right away. is this right for the minimum or am i supposed to enter values and it will display the minimum value like in parts a and b wit the maximum? will the minimum just always be 0 or ?
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Nov 15, 2014
Write a program that reads from the user an integer and reduce it by multiplying its non-zero digits. The result of the multiplication is a number which is to be reduced as the initial one. This process continues until an integer of one single digit is obtained. For example:
64734502 (6 * 4 * 7 * 3 * 4 * 5 * 2) 20160 (2 * 1 * 6) 12 (1 * 2) 2
Your program should display the number obtained in every iteration.
Sample run1
Enter an integer: 64734502
After iteration 1: 20160
After iteration 2: 12
After iteration 3: 2
Sample run2
Enter an integer: 97737999
After iteration 1: 6751269
After iteration 2: 22680
After iteration 3: 192
After iteration 4: 18
After iteration 5: 8
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Jun 13, 2014
How to input 10 integer elements in an array & sort them in desc. order using the bubble sort technique.
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Jun 7, 2015
Write a program that prompts the user to input an integer and then outputs both the individual digits of the number and the sum of the digits.
Now I have a code for spacing out the integers, and I have a separate code for adding the digits. But I am not sure how to merge them together. Both of them work independently
Spacing code:
import java.util.*;
public class SumoftheIntegers
{
static Scanner console=new Scanner(System.in);
public static void main(String []args) {
int num1, test, rem;
int counter = 0;
[Code]...
Now the sum of the integers code:
import java.util.Scanner;
public class sum
{
public static void main(String[] args)
{
// Create a Scanner
Scanner input = new Scanner(System.in);
// Enter amount
System.out.print("Enter an integer: ");
int integer = input.nextInt();
[Code]...
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Jan 20, 2015
so i'm following a java tutorial from the book and it has a few challenge questions. and i'm stucked on one. i think i just don't understand what is it that its asking me. heres the question, Write a statement that reads a user's input integer into the defined variable, and a second statement that prints the integer. assuming scanner is given, and i checked my heading code is ok.
Scanner scnr = new Scanner(System.in);
int userNum = 0;
System.out.println("What is the product of 8 time 2");
userNum = scnr.nextInt();
[code]....
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Jan 8, 2009
Create a method called mirrorImage, which takes two integer arrays as input parameters. You may assume that the two actual parameters have the same length. Your method should return true if the arrays are the reverse of each other. Otherwise mirrorImage should return false.
Examples:
data1:{1,2,3}
data2:{3,2,1}
==> true
[code].....
I'm pointing a place outside of the array or something
runtime error (line 8, column 0): java.lang.ArrayIndexOutOfBoundsException: 10
-> array.ArrayQuestions.mirrorImage()
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Jul 14, 2014
I just want to check that the given PDF file is 3D PDF or normal PDF file. how can I do this in JAVA?
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