
Explanation of Solution
Creating “CharacterFrequency.java”:
- Import required package.
- Define “CharacterFrequency” class.
- Define main function.
- Create array for digit count using “ArrayList”.
- Initialize the digit counts.
- Create object for scanner class.
- Prompt statement for telephone number.
- Read the telephone number from user.
- Compute the count of each character in the telephone number using “for” loop.
- Define each character in telephone number.
- Performs “switch” case.
- If the digit character is “0”, then increment the count of character “0” using “set” and “get” method
- If the digit character is “1”, then increment the count of character “1”.
- If the digit character is “2”, then increment the count of character “2”.
- If the digit character is “3”, then increment the count of character “3”.
- If the digit character is “4”, then increment the count of character “4”.
- If the digit character is “5”, then increment the count of character “5”.
- If the digit character is “6”, then increment the count of character “6”.
- If the digit character is “7”, then increment the count of character “7”.
- If the digit character is “8”, then increment the count of character “8”.
- If the digit character is “9”, then increment the count of character “9”.
- Prompt statement for count of each digit.
- Display the count of each digit using “for” loop.
- Display the count by using “get” method.
- Display count of each digit.
- Define main function.
Program:
The below java program is used to compute the count of each digit in a telephone number using “ArrayList”.
“CharacterFrequency.java”
//Import required package
import java.util.*;
//Define "CharacterFrequency" class
public class CharacterFrequency
{
//Define main function
public static void main(String[] args)
{
/* Create array for digit count using "ArrayList" */
ArrayList<Integer> digit_count = new ArrayList<Integer>();
//Initialize the digit counts
for(int i = 0; i < 10; i++)
{
digit_count.add(0);
}
//Create object for scanner class
Scanner reader = new Scanner(System.in);
//Prompt statement for user
System.out.print("Enter a telephone number: ");
//Read the telephone number from user
String telephoneNumber = reader.next();
/* Compute the count of each character in the telephone number */
for(int i = 0; i < telephoneNumber.length(); i++)
{
/* Define each character in telephone number */
Character digit = telephoneNumber.charAt(i);
//Performs "switch" case
switch(digit)
{
/* If the digit character is "0", then */
case '0':
/* Increment the count of character '0' by using "set" and "get" method */
digit_count.set(0, digit_count.get(0)+1);
break;
/* If the digit character is "1", then */
case '1':
/* Increment the count of character '1' */
digit_count...

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Chapter 12 Solutions
Java: An Introduction to Problem Solving and Programming (8th Edition)
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