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Java Exercises: Rearrange the alphabets in the order followed by the sum of digits

Java Basic: Exercise-192 with Solution

Write a Java program to rearrange the alphabets in the order followed by the sum of digits in a given string containing uppercase alphabets and integer digits (from 0 to 9).

Pictorial Presentation:

Java Basic Exercises: Rearrange the alphabets in the order followed by the sum of digits

Sample Solution:

Java Code:

import java.util.*;
import java.lang.*;
public class Solution {
 static final int MAX_CHAR = 20;

 public static void main(String args[]) {
  String str1 = "AND456HSE8";
  System.out.println(arrange_String_nums(str1));
 }
 static String arrange_String_nums(String str1) {
  int char_count[] = new int[MAX_CHAR];
  int sum_num = 0;
  for (int i = 0; i < str1.length(); i++) {
   if (Character.isUpperCase(str1.charAt(i)))
    char_count[str1.charAt(i) - 'A']++;
   else
    sum_num = sum_num + (str1.charAt(i) - '0');
  }

  String rarr_part = "";

  for (int i = 0; i < MAX_CHAR; i++) {
   char ch = (char)('A' + i);
   while (char_count[i]-- != 0)
    rarr_part = rarr_part + ch;
  }

  if (sum_num > 0)
   rarr_part = rarr_part + sum_num;
  return rarr_part;
 }
}

Sample Output: 

ADEHNS23

Flowchart:

Flowchart: Java exercises: Rearrange the alphabets in the order followed by the sum of digits

Java Code Editor:

Company:  Facebook

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Previous: Write a Java program to test whether there are two integers x and y such that x^2 + y^2 is equal to a given positive number.
Next: Write a Java program that accept an integer and find the sum of all the elements from all possible subsets of a set formed by first n natural numbers.

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Java: Tips of the Day

Java: Anagrams

Generates all anagrams of a string.

public static List<String> anagrams(String input) {
    if (input.length() <= 2) {
        return input.length() == 2
                ? Arrays.asList(input, input.substring(1) + input.substring(0, 1))
                : Collections.singletonList(input);
    }
    return IntStream.range(0, input.length())
            .mapToObj(i -> new SimpleEntry<>(i, input.substring(i, i + 1)))
            .flatMap(entry ->
                    anagrams(input.substring(0, entry.getKey()) + input.substring(entry.getKey() + 1))
                            .stream()
                            .map(s -> entry.getValue() + s))
            .collect(Collectors.toList());
}

Ref: https://bit.ly/3rvAdAK