String trim()

The trim() method in java is a part of the String class and is used to remove leading and trailing whitespace characters from a string. It returns a new string with all whitespace characters removed from the beginning and end of the original string.

The basic syntax of the trim() method is as follows:

String trim()

Here’s how you can use it:

String original = "   Hello, World!   ";
String trimmed = original.trim(); // "Hello, World!"

In this example, the trim() method is called on the string " Hello, World! ", and it returns a new string with the leading and trailing whitespace characters removed.

Keep in mind the following:

• The trim() method doesn’t modify the original string. Instead, it creates a new string with the trimmed content.
• “Whitespace characters” in this context include space characters, tabs (\t), newline characters (\n), carriage return characters (\r), and other Unicode whitespace characters.
• Only leading and trailing whitespace characters are removed. Any whitespace characters within the string are left unchanged.
• If the string consists only of whitespace characters, the result of trim() will be an empty string.

Here are a few more examples:

String str1 = "    Leading and trailing spaces    ";
String str2 = "\tTab characters\t";
String str3 = "\nNewline characters\n";
String str4 = "\rCarriage return characters\r";
String str5 = "  \t  \n  Mixed whitespace  \t\n  ";

String trimmed1 = str1.trim(); // "Leading and trailing spaces"
String trimmed2 = str2.trim(); // "Tab characters"
String trimmed3 = str3.trim(); // "Newline characters"
String trimmed4 = str4.trim(); // "Carriage return characters"
String trimmed5 = str5.trim(); // "Mixed whitespace"

The trim() method is often used when processing user input, such as removing extra spaces or ensuring that leading/trailing spaces do not affect the logic of your program.