In Java is there a way to check the condition:
"Does this single character appear at all in string x"
without using a loop?
Thank you,
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I have to perform a check on a character variable to see whether or not it is a currency symbol. I have discovered the Character.UnicodeBlock.CURRENCY_SYMBOLS constant however I am unsure of ... |
I am coding a method that returns whether a given character is valid, which looks like this: -
private static boolean isValid(char c) {
return c == '.' || ...
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How do you check a string if there is a special character like: [,],{,},{,),*,|,:,>,etc.?
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I have a char variable that is supposed to contain either a Y,y,n or N character, I want to test if it does not contain it, then display an error message ... |
We have a string input and the following combinations are valid (e.g. sunday, *sunday*, sun*day*, *sun*day, su*nda*y)
If it contains only a single asterisk, then it is a bad input.
So given the ... |
if (c=='a' || c=='e' || c=='i' || c=='o' || c=='u') {
count++;
When i give the above statement it returns number of vowels in a ... |
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Is there a way to check if two strings contain the same characters. For example,
abc, bca -> true
aaa, aaa -> true
aab, bba -> false
abc, def -> false
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What's the best and easiest way to check if a string only contains the following characters:
abcdefghijklmnopqrstuvwxyzABCDEFGHIJKLMNOPQRSTUVWXYZ0123456789_
I want like an example like this pseudo-code:
//If String contains other characters
else
//if string contains only those ...
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Here's what I've got:
private static int countNumChars(String s) {
for(char c : s.toCharArray()){
if (Equals(c," "))
}
}
But that ... |
I want to check the value of a char to see if it is double quote or not in Java. How can I do it?
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I have to read in a name for a string, and then verify that it is a name. So something like"smith23" would have to be used to abort the program.
... |
I have this loop:
String cont = "";
while ( cont != "n" ) {
// Loop stuff
System.out.print("another item (y/n)?");
cont = input.next();
}
However, when I type "n" to stop the loop, it just keeps running. ... |
I am asking for user input in a string and i want to check for is alpha or numeric but i am new to java. this is what i have so ... |
This is dealing with java to start.
My goal is to take in a Vin number and store it into a string. Make sure it has no more than 9 characters. ... |
Possible Duplicate:
JAVA: check a string if there is a special character in it
I'm testing a method that transforms a string into another string except ... |
I am trying to loop through a string and check each character if one of the characters is a number. If it is a number, I want to return it as ... |
I want to know if a String such as "equi-distant" or "they're" contains a non-word character. Is there a simple way to check for it?
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I am so sorry for not getting back to you. Immediately after posting my question, my computers all died, so I was running around...again...figuring out a way to do my schoolwork, ... |
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Offhand, I can't think of anything clever. But you can always go char by char... class StringBreaker { static String breakIt(String input) { StringBuffer buff = new StringBuffer(); for(int x = 0; x < input.length(); x++) { char c = input.charAt(x); if(Character.isUpperCase(c)) { buff.append(" " + Character.toLowerCase(c)); } else { buff.append(c); } } return buff.toString(); } public static void main(String[] args) ... |
This example just show you how to control the user input, user can type in 0-9 in the text field only: public void keyTyped( KeyEvent e) { char ch = e.getKeyChar(); System.out.println("key name: " + ch); if ( ch < '0' | | ch > '9' ) // not a digit e.consume(); } Hope this helps! You need to register your ... |
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Hi, Welcome to JavaRanch! Well, as I see it, there are a number of steps here: 1) Getting ahold of the String in question; 2) Checking that it's 9 characters long; 3) Getting ahold of the String's 1st character; 4) Checking that it's uppercase; and 5) Reporting the result of the tests. Let us know which of these parts you're having ... |
Hello. I am trying to make my program read a token from a string, and print out an error if the token contains invalid characters, ie smit4h. I have this.... public static void surnameValidation()// surname validation { for(int i=0; i |
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I am doing a program that should act as a calculator; I have the following in it now how do I check if the value of x is an integer and NOT some random character. I hope I am being clear thanks // initialize first input1 number Scanner input1 = new Scanner(System.in); // prompt for the first number System.out.println("Please enter the ... |
Hi i want to check whether there is any java special character exist in a string or not. Could anybody help me on this. Special Characters: \!@#$%^*()_+|}{[]\:';"<>,./? ... |
Hi, I may get more than 1000 lines in a file. Each line ends with a new line character. Sometimes the file may have 4 lines. Other lines will have characters such as , : alone. I'm storing each line in the database if it is a valid line and If the line contains only the above characters (, : ) ... |
Hi, I may get more than 1000 lines in a file. Each line ends with a new line character. Sometimes the file may have 4 lines. Other lines will have characters such as , : alone. I'm storing each line in the database if it is a valid line and If the line contains only the above characters (, : ) ... |
check a string char by char Hi, first of all the code: Java Code: import java.io.*; import java.util.Calendar; import java.text.SimpleDateFormat; import java.text.DecimalFormat; class UserInput { public static String getString() { String line; InputStreamReader input=new InputStreamReader(System.in); BufferedReader in=new BufferedReader(input); try { line=in.readLine(); return line; } catch(Exception e) { return "Exception"; } } public static int getInteger() { String line; InputStreamReader ... |
Hello I have below program in this program I want to check if string a contains all char in char[] b array, with the example of String a="cash" and char[] b={'c', 'h'}, I have correct result, unfortunately my string and char array will be dynamic, will change during the program and if I have String a="h" and char[] b={'c', 'h'}, my ... |
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Hello, How can I check if a variable is empty or not? I have a JTextField and if the user didn't type anything in, I want the JLabel to turn red. The if statement I'm using doesn't work: if (tailnumber == "") I'm not familiar with the Java operators... can you use !tailnumber ? I know this is a simple question, ... |
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hsc71 wrote: Take the length of the shortest string. The difference in length is an error anyway according to what youv'e written. No, based on what he's said so far, he'll at least need to take the difference in the lengths, and probably add to it the number of differences in corresponding characters along the shared length. Like I said though, ... |
http://www.catb.org/~esr/faqs/smart-questions.html#writewell How To Ask Questions The Smart Way Eric Steven Raymond Rick Moen Write in clear, grammatical, correctly-spelled language We've found by experience that people who are careless and sloppy writers are usually also careless and sloppy at thinking and coding (often enough to bet on, anyway). Answering questions for careless and sloppy thinkers is not rewarding; we'd rather spend our ... |
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Nope, I got this example from web. I worked this out sucessfully. Now i know how to check using matcher and pattern in java , if i have a regex. What i need is to check if a string contains only this charaters. abcdefghijklmnopqrstuvwxyz-.@_ABCDEFGHIJKLMNOPQRSTUVWXYZ0123456789 i could not create a valid regex to do the same. I need help here. |
Hi, I may get more than 1000 lines in a file. Each line ends with a new line character. Sometimes the file may have 4 lines. Other lines will have characters such as , : + alone. I'm storing each line in the database if it is a valid line and If the line contains only the above characters (, : ... |
/** * @param inputStr * @return boolean: true of valid string * @desc Check for special characters string */ public static boolean isValidPassword(String inputStr) { boolean isValidStr = true; for (int i= 0; i < inputStr.length(); i++) { char ch= inputStr.charAt(i); if (!isAlphaNumeric(ch+"")) { // Special Character // Domain Value Check if (!(isValidSpecialCharacter(ch))) { isValidStr = false; break; } } } ... |
Hi, I'd like to know if there's an easy way to check if a character in a string isn't a standard a-z character (not a number or punctuation or special characters). I want special characters like and to be treated as a letter, meaning not returning the method true. Please help, Considerate |
Of course there is more code but this is the basic part that I am having trouble. I haven't even been able to successfully run it. The part that is giving me the ttrouble is in bold. I have tried everything that I know how to... If someone could help me then that would be great. I have already done a ... |
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HI. I am writing some validation code, and basically need to check whether the user pressed the enter key when they were asked to enter input (which is saved into a character variable).... how would i go about doing this? I know how to do it with a string as i check if the string is equals "" but I dont ... |
Would like to know how-to check if a char typed value is null. public class MyHelper { public int Number; public static char computeCh() { char ch; // Implementation to compute ch. return (ch); } } // Inside Calling method. if ( MyHelper.computeCh() != null) // it does throw compilation error. { // Code goes on...... } |
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Hi I am new to java, but have some trouble with it. What is the easiest way to check if the specific string contains same characters and if so, then printing it out? For example, if the string is "abcd", then the program prints nothing, but if the string is "abcab", then it prints "yes a, yes b". It should be ... |
Can anyone think of, or know of, a way of checking a String for odd characters? For example, someone has produced an XML document using MS Word, and it contains some of those word-specific characters that would break an xml parser. I've tried using the Regex package, but that gets too complex and you can't include all the characters I want ... |
How do I throw an exception to check a character in a string? I'm trying to create an if statement where it can check in a string for certain characters. And when the character statements are met an exception has to be thrown. So far I've had no luck creating the if statement. Can someone help me out? |
If I use following code It is printing all special characters as a ? so it's ASCII value is 63, so I can't able to relay on this 63 value, bcz here in my String there is one "?" character is there but How do I know whether it is a "?" or some other character. String a = "Ab^)]%$#@!?><:;\"'}{"; final ... |
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