how to remove leading space in java

To remove leading spaces (whitespace characters at the beginning of a string) in Java, you can use the trim method of the String class. The trim method returns a new string with leading and trailing whitespace characters removed.

Here is an example of how you can use the trim method to remove leading spaces from a string in Java:

String originalString = "    Hello, World!";
String modifiedString = originalString.trim();

System.out.println(modifiedString);  // Outputs "Hello, World!"

In this example, the trim method is called on the originalString string, which removes the leading spaces and returns a new modifiedString string with the leading spaces removed.

You can also use the replaceAll method or regular expressions to remove specific characters or patterns from a string. For example, to remove only leading spaces, you can use the following regular expression:

String modifiedString = originalString.replaceAll("^\\s+", "");

This regular expression will match one or more leading whitespace characters (\\s) and replace them with an empty string ("").

Keep in mind that the trim and replaceAll methods operate on the original string and return a new modified string, without changing the original string. If you want to modify the original string, you can assign the modified string back to the original string variable, or use a StringBuilder object.