Miscellaneous String Operations

Program Plan:

The detail of “StringOperationsDemo” class is shown below:

• In the “main()” method,
  • Declare and initialize the variable and array variable.
  • Call the wordCount() method to display the number of words in string.
  • Call the mostFrequent() method to display the most frequently occurring character.
  • Call replaceSubString() method to replace “the” with “that”.
  • Call arrayToString() method to convert an array to a string.
  • Display the converted string.

The detail of “StringOperations” class is shown below:

• In the “wordCount()” method,
  • Separate the string using a space delimiter.
  • Return the number of words in string.
• In the “arrayToString()” method,
  • Convert the array value to string.
  • Return the converted string.
• In the “mostFrequent()” method,
  • Declare the variable.
  • Convert the String to an array and store into “cArray” variable.
  • Create an integer array variable to store the frequencies of the characters in “cArray” variable.
  • The for loop executes until the frequencies length. If yes,
    • Initialize frequencies elements to “0”.
  • The for loop executes until the array length. If yes, loop executes until the array length. If yes,
    • Check frequency of element and then calculate it.
  • The for loop executes until the frequencies length. If yes,
    • Check the frequencies of elements and determine the most frequent character.
  • Return the most frequent character.
• In the “replaceSubString()” method,
  • Check the “string2” and “string3” are the same. If yes,
    • Return the string.
  • Create an object for “string1”.
  • Determine the first occurrence of “string2”.
  • The while loop executes until the "index" is not equal to “-1”. If yes,
    • Call the replace() method to replace this occurrence of the substring.
    • Find the next occurrence of “string2”.
  • Return the string.