Write a program to input a string in uppercase and print the frequency of each character.

Java Programming Language (Article) (Program)

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Write a program to input a string in uppercase and print the frequency of each character.

Example:

Input: COMPUTER HARDWARE

Output:

CHARACTERS   FREQUENCY
A            2
C            1
D            1
E            2
H            1
M            1
O            2
P            1
R            2
T            1
U            1
W            1

Program:

import java.io.*;

class Frequency {
    String s;
    int i, j, l, f;

    void display() throws IOException {
        BufferedReader br = new BufferedReader(new InputStreamReader(System.in));
        System.out.println("Enter a string in upper case:");
        s = br.readLine();
        l = s.length();

        System.out.println("CHARACTERS   FREQUENCY");
        for (i = 65; i <= 90; i++) { // ASCII values for 'A' to 'Z'
            f = 0;
            for (j = 0; j < l; j++) {
                if (s.charAt(j) == i) {
                    f++;
                }
            }
            if (f > 0) {
                System.out.println((char)i + "\t\t" + f);
            }
        }
    }

    public static void main(String[] args) throws IOException {
        Frequency freq = new Frequency();
        freq.display();
    }
}

Output:

Explanation:

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