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Nov 2, 2023 · Method 1: Using string class in built functions. To remove all white spaces from String, use the replaceAll () method of the String class with two arguments, which is. replaceAll("\\s", ""); where \\s is a single space in unicode. Example: Java. class BlankSpace { public static void main(String[] args) {
- 14 min
Mar 28, 2011 · Use the static method "StringUtils.deleteWhitespace(String str)" on your input string & it will return you a string after removing all the white spaces from it. I tried your example string " name=john age=13 year=2001 " & it returned me exactly the string that you wanted - " name=johnage=13year=2001 ".
- Overview
- Introduction to The Problem
- Removing All Whitespace from A String
- Replacing Consecutive Whitespace Characters with One Single Space
- Remove only Leading and Trailing Whitespace
- Conclusion
When we manipulate Strings in Java, we often need to remove whitespace from a String. In this tutorial, we’ll explore common scenarios for removing whitespace from a Stringin Java.
To understand the problem easier, let’s first see a string example: The example above shows that the myStringvariable contains multiple leading, trailing spaces, and whitespace characters in the middle. Usually, when we need to deal with a string like myStringin Java, we often face these two requirements: 1. removing all whitespace characters from ...
3.1. Using String.replaceAll
First, we’ll remove all whitespace from a string using the replaceAll()method. replaceAll() works with regular expressions (regex). We can use the regex character class ‘\s‘ to match a whitespace character. We can replace each whitespace character in the input string with an empty string to solve the problem: inputString.replaceAll(“\\s”, “”). Then we’ll create a test to see if this idea works with our example string: If we run the test, it passes. So the replaceAll() method solves the proble...
3.2. Using the Apache Commons Lang3 Library
The Apache Commons Lang3 library ships with a StringUtilsutility, which allows us to manipulate strings conveniently. To get started using Apache Commons Lang 3, let’s add the Maven dependency: If we check the methods in the StringUtils class, there’s one method called deleteWhitespace(). The name implies that it’s the method we’re looking for. Next, we’ll remove all whitespace from a string using StringUtils.deleteWhitespace(): The test passes when we execute it. So the deleteWhitespace()doe...
4.1. Using String.replaceAll
Now let’s look at the other scenario. We can solve this problem in two steps: 1. replacing consecutive whitespace with one single space 2. trimming the result of the first step It’s worth mentioning that we can also first trim the input string, and then replace consecutive whitespace. So it doesn’t matter which step we take first. For the first step, we can still use replaceAll()with a regex to match consecutive whitespace characters and set one space as the replacement. The regex ‘\s+’ match...
4.2. Using the Apache Commons Lang3 Library
The StringUtils.normalizeSpace() method trims the input string and then replaces sequences of whitespace characters with a single space. Therefore, we can directly call this method to solve the problem: The test passes when we execute it. As we can see, StringUtils.normalizeSpace()is pretty straightforward to use.
5.1. Using strip
The strip() method is used to remove leading and trailing whitespace from a string. This method was introduced in Java 11 and is more Unicode-aware than the older trim() method, which only removes the standard ASCII whitespace characters. Let’s see how we can use this method to remove leading and trailing whitespace from a string: In this example, strip()removes only the leading and trailing whitespace. It doesn’t remove whitespace within the string.
5.2. Using stripLeading
Java 11 also introduced stripLeading() and stripTrailing()methods to remove whitespace only from the beginning or end of the string, respectively: In the above code example, we remove the leading and trailing whitespaces using stripLeading() andstripTrailing()methods.
In this article, we learned how to remove whitespace characters from a string in Java. As always, the complete source code is available over on GitHub.
- Kai Yuan
Learn how to use replaceAll() method with regular expression to remove all whitespaces in a string. See examples with input and output, and code explanation.
Java String Handling. Removing spaces from a string is a common task in Java. This guide will cover different ways to remove spaces, including using the replace and replaceAll methods, the StringBuilder class, and the Stream API (Java 8 and later).
Sep 26, 2023 · The trim function in Java String is a built-in function that eliminates leading and trailing spaces. The Unicode value of the space character is ‘\u0020’. The trim () method in Java checks this Unicode value before and after the string, if it exists then removes the spaces and returns the omitted string.
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The replace() method of the String class can be used to remove all white spaces from a string by replacing each white space character with an empty string. Example: public class RemoveWhiteSpaceUsingReplace { public static void main(String[] args) { String str = " Hello World "; // Remove all white spaces using replace() .
