Java: Get the index of all the characters of the alphabet

Last update on March 17 2025 13:24:15 (UTC/GMT +8 hours)

Write a Java program to get the index of all the characters of the alphabet.

Sample string of all alphabet: "The quick brown fox jumps over the lazy dog."

Sample Solution:

Java Code:

// Define a public class named Exercise19.
public class Exercise19 {
    // Define the main method.
    public static void main(String[] args) {
        // Declare and initialize a string variable.
        String str = "The quick brown fox jumps over the lazy dog.";

        // Get the index of all the characters of the alphabet
        // starting from the beginning of the String.
        int a = str.indexOf("a", 0);
        int b = str.indexOf("b", 0);
        int c = str.indexOf("c", 0);
        int d = str.indexOf("d", 0);
        int e = str.indexOf("e", 0);
        int f = str.indexOf("f", 0);
        int g = str.indexOf("g", 0);
        int h = str.indexOf("h", 0);
        int i = str.indexOf("i", 0);
        int j = str.indexOf("j", 0);
        int k = str.indexOf("k", 0);
        int l = str.indexOf("l", 0);
        int m = str.indexOf("m", 0);
        int n = str.indexOf("n", 0);
        int o = str.indexOf("o", 0);
        int p = str.indexOf("p", 0);
        int q = str.indexOf("q", 0);
        int r = str.indexOf("r", 0);
        int s = str.indexOf("s", 0);
        int t = str.indexOf("t", 0);
        int u = str.indexOf("u", 0);
        int v = str.indexOf("v", 0);
        int w = str.indexOf("w", 0);
        int x = str.indexOf("x", 0);
        int y = str.indexOf("y", 0);
        int z = str.indexOf("z", 0);

        // Display the results of all the indexOf method calls.
        System.out.println(" a  b c  d e  f  g h i  j");
        System.out.println("=========================");
        System.out.println(a + " " + b + " " + c + " " + d + " " +
                           e + " " + f + " " + g + " " + h + " " +
                           i + " " + j + "\n");

        System.out.println("k  l  m  n  o  p q  r  s  t");
        System.out.println("===========================");
        System.out.println(k + " " + l + " " + m + " " + n + " " +
                           o + " " + p + " " + q + " " + r + " " +
                           s + " " + t + "\n");

        System.out.println("u  v  w  x  y  z");
        System.out.println("================");
        System.out.println(u + " " + v + " " + w + " " + x + " " +
                           y + " " + z);
    }
}

Sample Output:

a  b c  d e  f  g h i  j                                                                                     
=========================                                                                                     
36 10 7 40 2 16 42 1 6 20                                                                                     
                                                                                                   
k  l  m  n  o  p q  r  s  t                                                                                   
===========================                                                                                   
8 35 22 14 12 23 4 11 24 31                                                                                   

u  v  w  x  y  z                                                                                              
================                                                                                              
5 27 13 18 38 37

Flowchart:

For more Practice: Solve these Related Problems:

• Write a Java program to map each letter of the alphabet to its index in a given string and display the mapping.
• Write a Java program to count the occurrences of each alphabet character in a string and display their indices.
• Write a Java program to create an array representing the positions of each letter of the alphabet in a sentence.
• Write a Java program to print the indices of vowels and consonants separately for a provided alphabet string.

Java Code Editor:

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