Java - String String Trimming

Introduction

trim() method removes all leading and trailing whitespaces and control characters from a string.

trim() method removes characters from the string, which have Unicode value less than \u0020 (decimal 32).

For example,

• " hello ".trim() will return "hello"
• "hello ".trim() will return "hello"
• "\n \t\t\t\t \r \t hello\n\n\n\r\r" will return "hello"

trim() method removes only leading and trailing whitespaces.

It does not remove any whitespace or control characters in the middle.

For example,

" he\nllo   ".trim() will return  "he\nllo" because \n is inside the string.
"h ello".trim() will return  "h ello" because the space is inside the string.

Demo

public class Main {
  public static void main(String[] args) {
    System.out.println("   hello  ");
    System.out.println("hello    ");
    System.out.println("\n \t\t\t\t  \r \t  hello\n\n\n\r\r");
    System.out.println(" he\nllo   ");
    System.out.println("h ello");
    //from w w  w.ja v a  2 s  . com
  }
}

Result

Exercise

• Write code to Trim a string or word by removing both first and last blank character
• Write code to trim Trailing White Space from a StringBuilder
• Write code to trim Prefix from a string
• Write code to trim Suffix
• Write code to Trim off recurring strings from the front of a string.
• Write code to trim a string by character
• Write code to trim a string from Left with specified character
• Write code to trim a string from Right by specified character
• Write code to Given a string, trim it, and if different from the string "", check to see if it is in a collection of strings (using equals()).
• Write code to trim Last Slash
• Write code to trim First Slash
• Write code to trim After Last Slash
• Write code to trim All Whitespace from a string
• Write code to Strip any white space of the end of a string.
• Write code to strip Extension
• Write code to strip Path ending \
• Write code to strip Html Special Chars
• Write code to strip Extension from a file name in String
• Write code to shrink multiple spaces to one
• Write code to Remove trailing whitespace from the given string.
• Write code to Truncate blank spaces at the end of the string provided

• Previous
• Next