Java - String Character at an Index

Introduction

Use the charAt() method to get a character at a particular index from a String object.

The index starts at zero. Index of a Character in a String Object.

Index ->          0      1       2      3      4
Character ->      H      E       L      L      O

The index of the first character H is 0 (zero), the second character E is 1, and so on.

The index of the last character O is 4, which is equal to the length of the string "Hello" minus 1.

The following snippet of code will print the index value and the character at each index in a string of "HELLO":

Demo

public class Main {
  public static void main(String[] args) {
    String str = "HELLO";

    // Get the length of string
    int len = str.length();

    // Loop through all characters and print their indexes
    for (int i = 0; i < len; i++) {
      System.out.println(str.charAt(i) + " has index " + i);
    }//from  w w w .jav a2 s .  co m

  }
}

Result

Quiz

• find the first non-repeating character in String

Exercise

• Write code to check if a string is Alphanumeric or Space
• Write code to check if a string is Alpha Space
• Write code to check if a string is Blank
• Write code to check if a string is Not Empty using and operator
• Write code to check if a string is Numeric in each character
• Write code to check if a string is Numeric Space
• Write code to check if a string is Whitespace
• Write code to check if a string contains a char
• Write code to check if a string has At Least N Characters
• Write code to count Matches for a char inside a string
• Write code to truncate Last Char
• Write code to truncate specified last N char
• Write code to Return the number of occurrences of character in string.
• Write code to Check whether the first non-whitespace character of the given line of text is the asterix (*).
• Write code to Return the number of characters in the two Strings that are the same.
• Write code to Capitalize the first letter.
• Write code to Capitalize or un-Capitalize the first letter
• Write code to check if a char is Lower English Character
• Write code to Remove all quote characters from a specified String , including single (') and double (") quotes.
• Write code to check if a string is Blank using Character.isWhitespace()
• Write code to quote Html Special Chars
• Write code to unquote Html Special Chars
• Write code to Clean the generated alias by removing any non-alpha characters from the beginning.
• Write code to convert String from one CharSet to another CharSet
• Write code to last character in a string
• Write code to return the number of occurrences of a character in a string
• Write code to remove a number of characters from the beginning and the end of a string
• Write code to take a String as an argument and removes all occurrences of the supplied Char.
• Write code to take a String as an argument and removes all occurrences of the supplied Chars.
• Write code to get first char from string
• Write code to Return one character from input string.
• Write code to remove all occurrences of the supplied Char from a string
• Write code to remove all occurrences of the supplied Chars from a string
• Write code to Remove extra (more than one) whitespace characters from any place of the string.
• Write code to check if a string is all Digit via char array
• Write code to count character in given text
• Write code to cast To Char and return Optional<Character>
• Write code to check if a char is Chinese char by checking its Character.UnicodeBlock
• Write code to count char in a string
• Write code to Count the number of times the given char is in the string
• Write code to construct String by appending char array
• Write code to Get last n chars from a string.
• Write code to Return the number of occurrences of target character in the supplied string.
• Write code to sort characters in a string
• Write code to Return a new string created from the input string through the character order reversing.
• Write code to set First Char of a string
• Write code to get the maximum occurring character in inputString
• Write code to removes duplicate characters from the String
• Write code to Remove all the characters present in removal String from source String
• check if a string has Even Amount Of a Char
• Write code to remove Char from string

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