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Java Data Type Q&A » Number » input number 

1. Java: Using charAt in a loop and determining the number of spaces in the input    stackoverflow.com

This is the assignment: Write a program that determines the number of spaces in an input line. Read ...

2. Handle blank input line and check string is number in Java    stackoverflow.com

If I am asking for user input:

  1. How can I handle a blank input (e.g. for a name of a person)?
  2. How can I ensure that a String input required to be a ...

3. how can i write a function which takes number(n) as input and automatically creates (n) number of objects for a class    stackoverflow.com

for(int i=0; i<n;i++) {
    Node "obj"+i =new Node();
}

obj1.Node_val(2,3);
obj2.Node_val(9,8);
i tried this, but not works. Please can you help. Thank you.

4. Generating a random number in java based on user inputs for max and min    stackoverflow.com

I having a little trouble trying to genertae a radom set of numbers with what the user defines as max and min, I am new to programming and feel a little ...

5. I need help in trying to re-input a value whenever the user inputs a negative number    stackoverflow.com

import java.util.*;


public class Inheritance {

    public static Scanner objScan = new Scanner(System.in);

    public static void main(String[] args) {

        ...

6. Return numbers from String input, Java    stackoverflow.com

I am kind of stumped here and have been trying to figure this out for some time. This is homework, although I want to learn to code regardless. Here I have ...

7. How to determine the number of the input arguments in Java    stackoverflow.com

Is there some methods to determine the number of input arguments from console in Java. Or just compare args[i] to null?

8. How to code "if input != a number, then..."    stackoverflow.com

Well, I'm trying to figure out this thing. How would you code something like this (in Javglish):

if(input != a number)
{
    do something
}
How would I code this?

9. Validating String input has no numbers    stackoverflow.com

I have found how to validate that an input is a number using try/catch but how do I go about validating that a user input is alphabetical only and contains no ...

10. Standard deviation of input numbers with JAVA    stackoverflow.com

I am new to this place and in need of serious help. After spending 6 hours trying to figure out this, I am going insane and need help. Here is the ...

11. If input is/is not a number    bytes.com

P: 5 Hnizdo Hello, I've started learning java this semester in school and my level is still quite low. Now i found a problem with my program: I want the program ...

12. How do I input a number and print it?    coderanch.com

There are many ways to capture the user input from the command line. 1. use the package corejava ( import corejava.Console I have done assignment #2 EvenOrOdd , here is the sample code, hope it will help. import corejava.Console; public class EvenOrOdd { public static void main(String[] args) { int intD = 2; int intResult; boolean blnEorO; String strBO; strNo = ...

13. how to reduce the number of input parameters to a java function?    coderanch.com

Originally posted by Jeff Albrechtsen: You could use a factory pattern where you configure a factory then create the product That actually sounds more like the Builder pattern to me. An alternative is to simply introduce parameter objects: group parameters into their own classes. For example, instead of passing street, house number, zip code and city as separate objects, pass an ...

14. How to check whether the input string contains numbers,comma,colon    coderanch.com

If I can repharse your requirement, it will be " To check whether the user input contains anything else other than a to z or A to Z characters" Here anything else are numbers,colon,double,special characters etc So you create a pattern to get all the matches that does not contain a-z or A-Z. After you compile the pattern, the matches should ...

15. Extracting numbers from from a user input and comparing it to    coderanch.com

i personally cannot get lines 22-26 to do what they are supposed to do. It is supposed to reverse the guess and random number (ex: 123 = 321). Im just looking for a little bit of help on those lines. thankyou. import java.util.Scanner; public class Lottery { public static void main(String[] args) { //Generate random lottery numbers int lottery = (int)(Math.random() ...

16. Form Input Box that with the right 4 digit number will display a selected page on my site    coderanch.com

Ok, First of all Thank you to all that have taken the time to help me out as I haven't written a line of code for 10 years. I am going to to try and be as specific as possible with this post as to what I am trying to accomplish. My site: http://www.madison.k12.sd.us/mms/club7/RastelliRancher/default.htm the site is a project site that ...

17. Print all possible patterns of "(" and ")" for a input number    coderanch.com

Hi everyone, I want to print all possible combinations of "(" and ")" for any given number. Let me explain it with an example. value of n possible patterns n=1 () n=2 (()), ()() n=3 ((())), (())() ()(()), ()()() n=4 (((()))), ((()))() ()((())), (())(()),()()()() there is no place for ")(" . I need some basic approach to follow. What in my ...

18. printing number of pos/neg numbers input?    java-forums.org

i need to write a code that when you input 5 numbers, it displays how many pos, neg and 0s were entered. i thought i was pretty close...but as you can see my output is not right. can someone please point me in the right direction from herE? thank you. Java Code: import java.util.Scanner; public class negposzerovals { public static void ...

19. inputs numbers then outputs how many time a particular number appears    java-forums.org

Ok, this is what my teacher wants me to do: Write a program that reads a set of positive integers and outputs how many times a particular number appears in the list. You may assume that the data set has at most 100 numbers and -999 marks the end of the input data. The numbers must be output in increasing order. ...

20. geting user input (number)    java-forums.org

hey? im new to java.. i need help in getting the user's input. i need that Number that the user will input for me to use it for calculation.. pls do help me now.. my code is here,.. thanks.. u can send me msgs at klianelics08@gmail.com i need replies now ryt here.. thanx a lot.. /* Program Name : Fire law ...

21. input 3 numbers output order least to greatest    java-forums.org

Why don't you simply replace your variables with the corresponding values? For input 2 1 3 num1 = 2 num2 = 1 num3 =3 Now look at your code First if: if ((num1

22. New To Java - Input Number Won't Prompt, Wrong Result    java-forums.org

A simple program that compiled success, but can not input second number, no prompt. number doesn't match the first number input at keyboard with display on output. Thanks ======================== /* Enter two number at prompt * Add both number * Print out Total * * 1/31/2011 * Code Name Add2Number.java */ import java.io.*; class Add2Number { public static void main(String[] args) ...

24. Creating a number of objects based on user input.    java-forums.org

public class CustomerDemo { public static void main(String[] args){ Scanner in = new Scanner(System.in); System.out.print("How many customers would you like to enter? "); while(!in.hasNextInt()){ System.out.println("'" + in.nextLine() + "'" + " is not a valid entry. Please enter a number: "); } int customers = in.nextInt(); for(int i = 1; i <= customers; i++){ Customer customer = new Customer(i); System.out.println("Please enter ...

25. Random Number Generator with User Input    java-forums.org

import java.util.*; class Random1 { public static void main(String args[]) { Random ar=new Random(); Scanner read=new Scanner(System.in); int n; System.out.println("Enter min value"); int min=read.nextInt(); System.out.println("Enter max value"); int max=read.nextInt(); if(max==min) System.out.println("Random number between "+min+ "-" +max+" is "+max); do { n=ar.nextInt(max); if(n>=min) System.out.println("Random number between "+min+ "-" +max+" is "+n); } while(n

26. finding the power to a number then the user inputs a max a min power    java-forums.org

hi guys ineed some help on a basic program. the user has to input a base and a min and max of powers. from there the program has to determine all the answers including the min and max and has to output them. example: base: 2 min: 1 max: 3 so the answer should be 2 4 8. i have started ...

28. Write a pgm which takes in numbers as input and outputs the number in words    forums.oracle.com

switch(digit){ case 1: str = "one"; break; case 2: str = "two"; break; case 3: str = "three"; break; case 4: str = "four"; break; case 5: str = "five"; break; case 6: str = "six"; break; case 7: str = "seven"; break; case 8: str = "eight"; break; case 9: str = "nine"; break; case 0: str = "zero"; break; ...

29. What exception covers numbers being input when it shoud be a string?    forums.oracle.com

Hi, when the user is asked to enter their name into the textfield, I would like to catch if the user has entered numbers insted of letters. when running my program I can type numbers into the textfield and no error message will appear. At the bottom of my code I have a dialog box that appears if numbers instaed of ...

30. Using a range to input numbers to a table    forums.oracle.com

Right i get what you mean now so the code reads int a = Integer.parseInt(txtRangeFrom.getText()); int b = Integer.parseInt(txtRangeTo.getText()); int i = 1; for (int row = a; row <= b; row++) for (int col = 1; col <= 1; col++){ tblOut.setValueAt(Integer.toString(i),row,col); i++; } } When it compiles there are no errors. Works fine when the values are entered lik a=1 ...

31. Help with real number input: Is -0.0 < 0.0?    forums.oracle.com

Hello, I have written a program in java which reads a pair of real numbers. The first number correpsonds with temperature and the second number correpsonds with rainfall. The program continues to enter value pairs until a negative rainfall value is entered. The program then displays the highest temperature, lowest temperature, number of days and number of rainy days. Now like ...

32. Help with real number input: Is -0.0 < 0.0    forums.oracle.com

Hello, I have written a program in java which reads a pair of real numbers. The first number correpsonds with temperature and the second number correpsonds with rainfall. The program continues to enter value pairs until a negative rainfall value is entered. The program then displays the highest temperature, lowest temperature, number of days and number of rainy days. Now like ...

33. User Input for Unknown Number type?    forums.oracle.com

You are simply assuming that the user will enter something that can be interpreted as a double. If you're going to do different things based on some characteristics of the user's input, then you are going to have to check those characteristics yourself (via code that you write). In particular if you want to distinguish between int and double, you're going ...

34. Number Input Validation    forums.oracle.com

35. How to input numbers and validate    forums.oracle.com

Rewriten for the helpful words above! I am trying to find a way to input some numbers (Lat and Long) in an option pane, then validate that they are correct ie that there are the right number of numbers. I can do all of the above except that I can not check the validation. If anyone can help or point me ...

36. Need help with Java app for user input 5 numbers, remove dups, etc.    forums.oracle.com

First of all, learn to use braces & indentation. Based on your indentation, I assumed that the for loop went for several lines. I think every for loop, even if it's only one line, should have braces around it. It's a good idea for if & else statements as well. Actually, take a look at that for loop - you're setting ...

37. input.nextInt(number); help    forums.oracle.com

38. If input isnt a number    forums.oracle.com

I'm new to programming and i was wondering how you would create an error output such as say, you want just to insert numbers but you enter a letter. I cant figure out how to say that if the input isn't a number then put this error message. Any help or pointers would be great, thank you in advance.

39. limit input to 4 numbers ranging from 0001-9999    forums.oracle.com

Hello helpful Java friends, I am trying to limit the user to enter in an ID number that is 4 ints long and has leading zeros. So if the user enter 2 the code will make it 0002. The user also has to enter only ints. I am thinking it is a try catch but am not sure how to do ...

40. input numbers.. adding them    forums.oracle.com

41. how to allow only specific letters, numbers and symbols in input string    forums.oracle.com

Hi all i'm new to java and trying to program a polynom calculator. so, you can enter a polynom string like for example "2.1x^3 + 3x^2 - 1". this all works fine. but i only need numbers, some special symbols and only the letter x which will be the variable you can enter here, otherwise a message should be displayed that ...

43. Write a pgm which takes in numbers as input and outputs the number in word    forums.oracle.com

switch(digit){ case 1: str = "one"; break; case 2: str = "two"; break; case 3: str = "three"; break; case 4: str = "four"; break; case 5: str = "five"; break; case 6: str = "six"; break; case 7: str = "seven"; break; case 8: str = "eight"; break; case 9: str = "nine"; break; case 0: str = "zero"; break; ...

44. how to input 2 numbers to the program?    forums.oracle.com

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