java remove spaces from string

Removing whitespace from strings in Java

stackoverflow.com › questions › 5455794 › removing-whitespace-from-strings-in-java

st.replaceAll("\\s+","") removes all whitespaces and non-visible characters (e.g., tab, \n).

st.replaceAll("\\s+","") and st.replaceAll("\\s","") produce the same result.

The second regex is 20% faster than the first one, but as the number consecutive spaces increases, the first one performs better than the second one.

Assign the value to a variable, if not used directly:

st = st.replaceAll("\\s+","")

Answer from Gursel Koca on Stack Overflow

Stack Overflow

stackoverflow.com › questions › 5455794 › removing-whitespace-from-strings-in-java

Removing whitespace from strings in Java - Stack Overflow

More on reddit.com

r/learnpython

May 3, 2017

[Java] Ignoring case, spaces, and punctuation while comparing strings

I know you can remove spaces from a string by doing something like: .replaceAll("\s",""); I think there might also be something you can use instead of \s to remove all non-word characters. More on reddit.com

r/learnprogramming

March 11, 2013

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GeeksforGeeks

geeksforgeeks.org › dsa › remove-spaces-from-a-given-string

Remove spaces from a given string - GeeksforGeeks

April 11, 2026 - #include <stdio.h> #include <string.h> char* removeSpaces(char s[]) { int n = strlen(s); for (int i = 0; i < n; i++) { if (s[i] == ' ') { // shift all characters to the left // starting from current index for (int j = i; j < n - 1; j++) { s[j] = s[j + 1]; } n--; i--; } } // return string up to new valid length // without spaces s[n] = '\0'; return s; } int main() { char s[] = "g eeks for ge eeks "; printf("%s", removeSpaces(s)); return 0; } Java ·

Baeldung

baeldung.com › home › java › java string › remove whitespace from a string in java

Remove Whitespace From a String in Java | Baeldung

August 13, 2024 - Usually, when we need to deal with a string like myString in Java, we often face these two requirements: removing all whitespace characters from the given string -> “IamawonderfulString!” · replacing consecutive whitespace characters with a single space, and removing all leading and trailing whitespace characters -> “I am a wonderful String !”

Programiz

programiz.com › java-programming › examples › remove-whitespaces

Java Program to Remove All Whitespaces from a String

import java.util.Scanner; class Main { public static void main(String[] args) { // create an object of Scanner Scanner sc = new Scanner(System.in); System.out.println("Enter the string"); // take the input String input = sc.nextLine(); System.out.println("Original String: " + input); // remove white spaces input = input.replaceAll("\\s", ""); System.out.println("Final String: " + input); sc.close(); } } Output · Enter the string J av a- P rog ram m ing Original String: J av a- P rog ram m ing Final String: Java-Programming · In the above example, we have used the Java Scanner to take input from the user.

Scaler

scaler.com › home › topics › remove whitespace from string in java

Remove Whitespace From String in Java - Scaler Topics

January 6, 2024 - These spaces are eliminated once the method trim() is called and the output is printed. ... Scaler learners achieved 2.5x salary growth with average post-Scaler CTC reaching ₹23L. ... The strip() method was introduced in Java 11. It also removes leading and trailing spaces present in the string.

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Medium

rameshfadatare.medium.com › java-program-to-remove-all-whitespace-from-a-string-819ccfb84997

Java Program to Remove All Whitespace from a String | by Ramesh Fadatare | Medium

December 13, 2024 - The replaceAll() method is used with the regular expression \\s to match all whitespace characters (spaces, tabs, newlines, etc.) and replace them with an empty string "". The program prints the string without any whitespace using ...

Medium

medium.com › @AlexanderObregon › trimming-extra-spaces-from-text-in-java-b20af8a84b6d

Trimming Extra Spaces from Text in Java | Medium

July 30, 2025 - Trimming text in Java usually starts with the two most common methods built right into the String class: trim() and strip(). Both are meant to clean up extra spaces at the beginning and end of a string, but they work differently once you look closer.

Java Code Geeks

javacodegeeks.com › home › core java

Different ways to remove Spaces from String In Java - Java Code Geeks

August 4, 2020 - It means we cannot modify a string, hence all the methods returns new string with all the transformations. trim() is the most commonly used method by java developers for removing leading and trailing spaces.

GeeksforGeeks

geeksforgeeks.org › java › how-to-remove-all-white-spaces-from-a-string-in-java

How to Remove all White Spaces from a String in Java? - GeeksforGeeks

13:58

In Java, to remove all white spaces from a String, there are several ways like using replaceAll() or manual iteration over characters.

Published July 11, 2025

Techndeck

techndeck.com › java-how-to-remove-whitespaces-from-a-string-simplest-example

Java - How to remove 'WHITESPACES' from a String? - Simplest Example - Techndeck

January 12, 2023 - public class Remove_Whitespaces_from_String_Java_Example { public static void main(String[] args) { String str = " Here we have a string with whitespaces "; // Remove leading and trailing whitespaces String strWithoutLeadingandTrailingSpaces = str.strip(); // Remove all whitespaces String strWithoutAnySpace = str.replaceAll("\\s", ""); System.out.println("String without Leading & Trailing spaces: "+strWithoutLeadingandTrailingSpaces); System.out.println("String without any space: "+strWithoutAnySpace); } }

Java String

javastring.net › home › how to remove whitespace from string in java

How to Remove Whitespace from String in Java

August 9, 2019 - We can also write a simple utility method to remove all the whitespaces from the string. It’s just for coding practice and you should adhere to the standard methods to replace whitespaces from the string. package net.javastring.strings; public class JavaRemoveWhitespaceFromString { public static void main(String[] args) { String str2 = "Hello\n\r\t Java"; // using replaceAll() System.out.println(str2.replaceAll("\\s", "")); // using custom method str2 = removeAllWhitespaces(str2); System.out.println(str2); } private static String removeAllWhitespaces(String str2) { char[] chars = str2.toCharArray(); StringBuilder sb = new StringBuilder(); for(int i = 0; i < chars.length; i++) { if(!Character.isWhitespace(chars[i])) { sb.append(chars[i]); } } return sb.toString(); } }

Vultr Docs

docs.vultr.com › java › examples › remove-all-whitespaces-from-a-string

Java Program to Remove All Whitespaces from a String | Vultr Docs

December 16, 2024 - This method reads each character in the string and replaces each substring that matches the regex with the given replacement. Utilize the regex \\s+ which matches one or more whitespace characters.

GeeksforGeeks

geeksforgeeks.org › java › java-remove-white-spaces-from-string-using-regex

Java - Remove White Spaces from String using Regex - GeeksforGeeks

July 23, 2025 - // Java Program to remove // white spaces using regex import java.util.regex.*; // Main Class public class RegexWhiteSpaceExampleOne { // Main method public static void main(String[] args) { // Input String String inputString = " Welcome to GeeksForGeeks "; // Remove white spaces using regex String outputString = inputString.replaceAll("\\s+", ""); // Display the results System.out.println("Input String: \"" + inputString + "\""); System.out.println("Output String: \"" + outputString + "\""); } }

Educative

educative.io › answers › how-to-remove-whitespaces-from-a-string-in-java

How to remove whitespaces from a string in Java

We have two methods to remove all the whitespaces from the string. In Java, we can use the built-in replaceAll() method to remove all the whitespaces of the given string.

Medium

medium.com › @azizmarzouki › trim-vs-strip-in-java-9481243db3a7

Trim() vs Strip() in Java

October 23, 2024 - "; // Using strip() to remove leading and trailing whitespace String strippedString = originalString.strip(); System.out.println("Original: '" + originalString + "'"); // Output: ' Hello, World!

Upgrad

upgrad.com › home › tutorials › software & tech › removing whitespace from string in java

8 Methods to Remove Whitespace From String in Java

June 25, 2025 - ". This string contains various whitespace characters, including spaces and a newline character. To remove all whitespace characters from the string, we use the replaceAll() method along with the regular expression pattern "\\s".

Conventional Commits

conventionalcommits.org › en › v1.0.0

Conventional Commits

A description MUST immediately follow the colon and space after the type/scope prefix. The description is a short summary of the code changes, e.g., fix: array parsing issue when multiple spaces were contained in string.

Baeldung

baeldung.com › home › java › java string › guide to splitting a string by whitespace in java

Guide to Splitting a String by Whitespace in Java | Baeldung

December 9, 2025 - The trim() method removes any leading or trailing whitespace that might otherwise create empty strings in our result, while \\s+ efficiently handles any sequence of whitespace characters as delimiters, regardless of their specific type or quantity.

reddit.com › r/learnprogramming › [java] removing extra whitespace from a string and counting words in a string?

r/learnprogramming on Reddit: [Java] Removing extra whitespace from a string and counting words in a string?

February 22, 2012 -

Hello all,
I am a college student taking my first programming class, and need help with some parts of an assignment, and was hoping I could get some help here. In the program we're writing, the user is prompted for a string, and then we must delete all extra whitespace between the words (so no trim), as well as making sure the sentence meets the minimum word count.

Here is what I have written for the word counter, but it seems really bulky, and it also doesn't count words if they are proceeded by a comma or other (valid) non-letter character:

//Error for a sentence with too few words.
int wordCountStart = 0;
int wordCount = 1;
char b = sentence.charAt(wordCountStart);
while (wordCountStart < sentence.length())
{
  while ((b == ' ') || (b == '(') || (b == ')') || (b == '.') || (b == '?') || (b == '!') || (b == ',') || (b == '/') || (b == '"') || (b == '[') || (b == ']') || (b == '-') || (b == ':') || (b == ';') ||(b == '\''))
  {
    wordCountStart ++;
    if (wordCountStart == sentence.length()) break;
    b = sentence.charAt(wordCountStart);
  }
  while (Character.isLetter(b))
  {
    wordCountStart ++;
    if (wordCountStart == sentence.length()) break;
    b = sentence.charAt(wordCountStart);
  }
  if (b == ' ')
  {
    wordCount ++;
  }
  
}
if (wordCount < 7)
{
  JOptionPane.showMessageDialog(null, "Your sentence needs to contain at least 7 words.", "Error", JOptionPane.ERROR_MESSAGE);
  System.exit(0);
}