🔤Java Strings Programs

Converts a sentence to title case, upper-casing each word's first letter and tidying extra spaces.

Check whether a string reads the same forwards and backwards.

Determines whether a string is made up entirely of letters.

Determines whether a string is made up entirely of digits.

Compares two strings and reports their lexicographic order.

Splits a string into a char array with toCharArray and shows the array is an independent copy.

Converts every letter in a string to lowercase.

Converts every letter in a string to uppercase.

Counts how many vowels and consonants a string contains, skipping spaces and punctuation.

Counts how many consonants appear in a string.

Counts how many digit characters appear in a string.

Counts how many space characters appear in a string.

Counts how many special characters appear in a string.

Counts the total number of characters in a string without using length().

Counts how many vowels appear in a string.

Counts how many words a sentence contains.

Finds the longest word in a sentence.

Finds the shortest word in a sentence.

Removes every digit character from a string.

Removes every space character from a string.

Removes every special character from a string, keeping letters, digits, and spaces.

Removes every vowel from a string.

Replaces every occurrence of one character with another.

Replaces every occurrence of a word with another word.

Reverse a string using a loop.

Sorts the characters of a string into alphabetical order.

Sorts the words of a sentence into alphabetical order.

Swaps the case of every letter in a string.

Check whether two strings are anagrams of each other.

Determines whether a word has no repeating letters.

Determines whether a sentence contains every letter of the alphabet.

Determines whether one string is a rotation of another.

Determines whether one string appears inside another.

Applies run-length encoding, replacing each run of a repeated character with the character and its count.

Counts how many non-overlapping times a substring appears in a string.

Generates every contiguous substring of a string.

Counts how many times each character appears in a string.

Finds every character that appears in both of two strings.

Finds every character that appears more than once in a string.

Finds the first character that appears exactly once in a string.

Finds the first character that repeats while scanning a string left to right.

Finds the last character, scanning from the end, that appears exactly once.

Finds the last character, scanning from the end, that appears more than once.

Finds the character that appears least often in a string.

Finds the longest starting substring shared by every word in an array.

Finds the character that appears most often in a string.

Removes repeated characters from a string, keeping each one's first occurrence.

Collapses runs of spaces down to a single space and trims the ends.

Reverses the letters within each word, keeping the word order intact.

Reverses the order of words in a sentence.

Generates every non-empty subsequence of a string.

Finds the longest contiguous substring that reads the same forwards and backwards.

Stores words in a prefix tree and suggests every word that starts with a typed prefix, in alphabetical order.