How to Remove Whitespace From String in Java

1. How to Remove Whitespace From String in Java
2. Remove Whitespace Using replaceAll() in Java
3. Remove whitespace Using Apache Library in Java
4. Remove Whitespace Using Pattern and Matcher in Java
5. Remove Space From a String in Java
6. Remove Space Using Apache in Java

This tutorial introduces how to remove whitespace from string in Java and lists some example codes to understand the space removing process.

How to Remove Whitespace From String in Java

Whitespace is a character that represents a space into a string. The whitespace character can be a " ", \n, \t, etc. To remove these characters from a string, there are several ways for example replace() method, replaceAll(), regex, etc. Let’s see the examples below.

Remove Whitespace Using replaceAll() in Java

Here, we use replaceAll() method of String class to remove whitespace. This method takes a regex as an argument and returns a string after removing all the whitespaces.

public class SimpleTesting {
  public static void main(String[] args) {
    String str = "Programming is easy to learn";
    String result = str.replaceAll("\\s+", "");
    System.out.println(result);
  }
}

Output:

Programminiseasytolearn

Remove whitespace Using Apache Library in Java

If you work with the Apache library, then use deleteWhitespace() method of the StringUtils class to remove whitespaces from a string in Java. See the example below and output.

import org.apache.commons.lang3.StringUtils;

public class SimpleTesting {

	public static void main(String[] args) {
		String str = "Programming is easy to learn";
		String result = StringUtils.deleteWhitespace(str);
		System.out.println(result);
	}
}

Output:

Programminiseasytolearn

Remove Whitespace Using Pattern and Matcher in Java

We can use Pattern and Matcher class with replaceAll() method to remove all the whitespaces from string in Java.

import java.util.regex.Matcher;
import java.util.regex.Pattern;

public class SimpleTesting {
  public static void main(String[] args) {
    String str = "Programming is easy to learn";
    Pattern p = Pattern.compile("[\\s]");
    Matcher m = p.matcher(str);
    String result = m.replaceAll("");
    System.out.println(result);
  }
}

Output:

Programminiseasytolearn

Remove Space From a String in Java

If you want to remove space only from a string, then use replace() method of String class. It will replace all the space (not all whitespace, for example, \n and \t) from the string in Java.

public class SimpleTesting {
  public static void main(String[] args) {
    String str = "Programming is easy to learn";
    String result = str.replace(" ", "");
    System.out.println(result);
  }
}

Output:

Programminiseasytolearn

Remove Space Using Apache in Java

Here, we use replace() method of StringUtils class of Apache to replace all the spaces from string in Java.

import org.apache.commons.lang3.StringUtils;

public class SimpleTesting {
  public static void main(String[] args) {
    String str = "Programming is easy to learn";
    String result = StringUtils.replace(str, " ", "");
    System.out.println(result);
  }
}

Output:

Programminiseasytolearn