here are several ways to remove spaces from a string in Java. Here are a few methods:

• Using the trim() method

The trim() method removes all leading and trailing spaces from a string. The following code shows how to use the trim() method to remove spaces from a string:

String text = "This is a sentence.";
 String trimmedText = text.trim();
 System.out.println(trimmedText); // Thisisasentence

• Using the replaceAll() method

The replaceAll() method replaces all occurrences of a specified substring with another substring. The following code shows how to use the replaceAll() method to remove spaces from a string:

String text = "This is a sentence.";
 String replacedText = text.replaceAll(" ", "");
 System.out.println(replacedText); // Thisisasentence

• Using the StringUtils.deleteWhitespace() method

The StringUtils.deleteWhitespace() method is a static method from the Apache Commons Lang library. It removes all whitespace from a string. The following code shows how to use the StringUtils.deleteWhitespace() method to remove spaces from a string:

import org.apache.commons.lang3.StringUtils;
 String text = "This is a sentence.";
 String deletedWhitespaceText = StringUtils.deleteWhitespace(text);
 System.out.println(deletedWhitespaceText); // Thisisasentence