Write your code in the file StringRec.java. For this problem, the following rest

Question

Write your code in the file StringRec.java. For this problem, the following restrictions apply: YOUR CODE MUST BE RECURSIVE.

Do not use loops (while, do/while, or for).

Do not declare any variables outside of a method.

You may declare local variables inside a method.

Complete the following method: public static String decompress(String compressedText): Decompress the input text, which has been compressed using the RLE algorithm (previous hw assignment): Run-length encoding (RLE) is a simple "compression algorithm" (an algorithm which takes a block of data and reduces its size, producing a block that contains the same information in less space). It works by replacing repetitive sequences of identical data items with short "tokens" that represent entire sequences. Applying RLE to a string involves finding sequences in the string where the same character repeats. Each such sequence should be replaced by a "token" consisting of:

1. the number of characters in the sequence

2. the repeating character

If a character does not repeat, it should be left alone. For example, consider the following string: qwwwwwwwwweeeeerrtyyyyyqqqqwEErTTT After applying the RLE algorithm, this string is converted into: q9w5e2rt5y4qw2Er3T In the compressed string, "9w" represents a sequence of 9 consecutive lowercase "w" characters. "5e" represents 5 consecutive lowercase "e" characters, etc. You may assume that the character counts will be single-digit numbers (a character will not repeat more than 9 times consecutively).

Hint #1: remember that characters are represented by numeric codes. You can decrement a character variable as follows: char c = '7'; c--; // c will now hold the character '6'

Hint #2: You probably will not need to use this hint for this problem. However, a fast way to convert a digit character into the numeric value of the digit is to subtract the character code for the digit zero: char c = '7'; // this has the character code 55, not 7 int x = c - '0'; // this produces the number 7

Explanation / Answer

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