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70 Java String exercises for String practice.
This project forked from xt0fer/stringtheory-zcw
70 Java String exercises for String practice.
70 Java String Exercises. How many of these can you do in two 1-hour sessions? If at first you cannot see the answer quickly, move to the next problem. Implement the tests suggested by the Sample Output and write the method that makes the tests succeed. 1. Write a Java program to get the character at the given index within the String. Sample Output: Original String = Java Exercises! The character at position 0 is J The character at position 10 is i 2. Write a Java program to get the character (Unicode code point) at the given index (1 and 9) within the String. Sample Output: Original String : w3resource.com Character(unicode point) = 51 Character(unicode point) = 101 3. Write a Java program to get the character (Unicode code point) BEFORE the specified index (1 and 9) within the String. Sample Output: Original String : w3resource.com Character(unicode point) = 119 Character(unicode point) = 99 4. Write a java program to count a number of Unicode code points in the specified text range of a String. Sample Output: Original String : w3rsource.com Codepoint count = 9 5. Write a java program to compare two strings lexicographically. Sample Output: String 1: This is Exercise 1 String 2: This is Exercise 2 "This is Exercise 1" is less than "This is Exercise 2" 6. Write a java program to compare two strings lexicographically, ignoring case differences. Sample Output: String 1: This is exercise 1 String 2: This is Exercise 1 "This is exercise 1" is equal to "This is Exercise 1" 7. Write a Java program to concatenate a given string to the end of another string. Sample Output: String 1: PHP Exercises and String 2: Python Exercises The concatenated string: PHP Exercises and Python Exercises 8. Write a Java program to test if a given string contains the specified sequence of char values. Sample Output: Original String: PHP Exercises and Python Exercises Specified sequence of char values: and true 9. Write a Java program to compare a given string to the specified character sequence. Sample Output: Comparing example.com and example.com: true Comparing Example.com and example.com: false 10. Write a Java program to compare a given string to the specified string buffer. Sample Output: Comparing example.com and example.com: true Comparing Example.com and example.com: false 11. Write a Java program to create a new String object with the contents of a character array. Sample Output: The book contains 234 pages. 12. Write a Java program to check whether a given string ends with the contents of another string. Sample Output: "Python Exercises" ends with "se"? false "Python Exercise" ends with "se"? true 13. Write a Java program to check whether two String objects contain the same data. Sample Output: "Stephen Edwin King" equals "Walter Winchell"? false "Stephen Edwin King" equals "Mike Royko"? false 14. Write a Java program to compare a given string to another string, ignoring case considerations. Sample Output: "Stephen Edwin King" equals "Walter Winchell"? false "Stephen Edwin King" equals "stephen edwin king"? true 15. Write a java program to print current date and time in the specified format. Sample Output: Current Date and Time : June 19, 2017 3:13 pm N.B. : The current date and time will change according to your system date and time. 16. Write a Java program to get the contents of a given string as a byte array. Sample Output: The new String equals This is a sample String. 17. Write a Java program to get the contents of a given string as a character array. Sample Output: The char array equals "[C@2a139a55" 18. Write a Java program to create a unique identifier of a given string. Sample Output: The hash for Python Exercises. is 863132599 19. Write a Java program to get the index of all the characters of the alphabet. Sample Output: a b c d e f g h i j ========================= 36 10 7 40 2 16 42 1 6 20 k l m n o p q r s t =========================== 8 35 22 14 12 23 4 11 24 31 u v w x y z ================ 5 27 13 18 38 37 Sample string of all alphabet: "The quick brown fox jumps over the lazy dog." 20. Write a Java program to get the canonical representation of the string object. Sample Output: str1 == str2? false str1 == str3? true 21. Write a Java program to get the last index of a string within a string. Sample Output: a b c d e f g h i j =========================== 36 10 7 40 33 16 42 32 6 20 k l m n o p q r s t =========================== 8 35 22 14 41 23 4 29 24 31 u v w x y z ================= 21 27 13 18 38 37 Sample string of all alphabet: "The quick brown fox jumps over the lazy dog." 22. Write a java program to get the length of a given string. Sample Output: The string length of 'example.com' is: 11 23. Write a Java program to find whether a region in the current string matches a region in another string. Sample Output: str1[0 - 7] == str2[28 - 35]? true str1[9 - 15] == str2[9 - 15]? false 24. Write a Java program to replace all the 'd' characters with 'f' characters. Sample Output: Original string: The quick brown fox jumps over the lazy dog. New String: The quick brown fox jumps over the lazy fog. 25. Write a Java program to replace each substring of a given string that matches the given regular expression with the given replacement. Sample string : "The quick brown fox jumps over the lazy dog." In the above string replace all the fox with cat. Sample Output: Original string: The quick brown fox jumps over the lazy dog. New String: The quick brown cat jumps over the lazy dog. 26. Write a Java program to check whether a given string starts with the contents of another string. Sample Output: Red is favorite color. starts with Red? true Orange is also my favorite color. starts with Red? false 27. Write a Java program to get a substring of a given string between two specified positions. Sample Output: old = The quick brown fox jumps over the lazy dog. new = brown fox jumps 28. Write a Java program to create a character array containing the contents of a string. Sample Output: Java Exercises. 29. Write a Java program to convert all the characters in a string to lowercase. Sample Output: Original String: The Quick BroWn FoX! String in lowercase: the quick brown fox! 30. Write a Java program to convert all the characters in a string to uppercase. Sample Output: Original String: The Quick BroWn FoX! String in uppercase: THE QUICK BROWN FOX! 31. Write a Java program to trim any leading or trailing whitespace from a given string. Sample Output: Original String: Java Exercises New String: Java Exercises 32. Write a Java program to find longest Palindromic Substring within a string. Sample Output: The given string is: thequickbrownfoxxofnworbquickthe The longest palindrome substring in the giv en string is; brownfoxxofnworb The length of the palindromic substring is: 16 33. Write a Java program to find all interleavings of given strings. Sample Output: The given strings are: WX YZ The interleavings strings are: YWZX WYZX YWXZ WXYZ YZWX WYXZ 34. Write a Java program to find the second most frequent character in a given string. Sample Output: The given string is: successes The second most frequent char in the string is: c 35. Write a Java program to print all permutations of a given string with repetition. Sample Output: The given string is: PQR The permuted strings are: PPP PPQ PPR ... RRP RRQ RRR 36. Write a Java program to check whether two strings are interliving of a given string. Assuming that the unique characters in both strings. Sample Output: The given string is: PMQNO The interleaving strings are MNO and PQ The given string is interleaving: true The given string is: PNQMO The interleaving strings are MNO and PQ The given string is interleaving: false 37. Write a Java program to find Length of the longest substring without repeating characters. Sample Output: Input String : pickoutthelongestsubstring The longest substring : [u, b, s, t, r, i, n, g] The longest Substring Length : 8 38. Write a Java program to print after removing duplicates from a given string. Sample Output: The given string is: w3resource After removing duplicates characters the new string is: w3resouc 39. Write a Java program to find first non repeating character in a string. Sample Output: The given string is: gibblegabbler The first non repeated character in String is: i 40. Write a Java program to divide a string in n equal parts. Sample Output: The given string is: abcdefghijklmnopqrstuvwxy The string divided into 5 parts and they are: abcde fghij klmno pqrst uvwxy 41. Write a Java program to remove duplicate characters from a given string presents in another given string. Sample Output: The given string is: the quick brown fox The given mask string is: queen The new string is: th ick brow fox 42. Write a Java program to print list items containing all characters of a given word. Sample Output: The given strings are: rabbit bribe dog The given word is: bib The strings containing all the letters of the given word are: rabbit bribe 43. Write a Java program to find the maximum occurring character in a string. Sample Output: The given string is: test string Max occurring character in the given string is: t 44. Write a Java program to reverse a string using recursion. Sample Output: The given string is: The quick brown fox jumps The string in reverse order is: spmuj xof nworb kciuq ehT 45. Write a Java program to reverse words in a given string. Sample Output: The given string is: Reverse words in a given string The new string after reversed the words: string given a in words Reverse 46. Write a Java program to reverse every word in a string using methods. Sample Output: The given string is: This is a test string The string reversed word by word is: sihT si a tset gnirts 47. Write a Java program to rearrange a string so that all same characters become d distance away. Sample Output: The given string is: accessories The string after arrange newly is: secrsecisao 48. Write a Java program to remove "b" and "ac" from a given string. Sample Output: The given string is: abrambabasc After removing the new string is: aramaasc 49. Write a Java program to find first non-repeating character from a stream of characters. Sample Output: String: godisgood Reading: g The first non-repeating character so far is: g Reading: o The first non-repeating character so far is: g Reading: d The first non-repeating character so far is: g Reading: i The first non-repeating character so far is: g Reading: s The first non-repeating character so far is: g Reading: g The first non-repeating character so far is: o Reading: o The first non-repeating character so far is: d Reading: o The first non-repeating character so far is: d Reading: d The first non-repeating character so far is: i 50. Write a Java program to find lexicographic rank of a given string. Sample Output: The Given String is: BDCA The Lexicographic rank of the given string is: 12 N.B.: Total possible permutations of BDCA are(lexicographic order) : ABCD ABDC ACBD ACDB ADBC ADCB BACD BADC BCAD BCDA BDAC BDCA 1 2 3 4 5 6 7 8 9 10 11 12 The BDCA appear in 12 position of permutation (lexicographic order). 51. Write a Java program to count and print all the duplicates in the input string. Sample Output: The given string is: w3resource The duplicate characters and counts are: e appears 2 times r appears 2 times 52. Write a Java program to check if two given strings are rotations of each other. Sample Output: The given strings are: ABACD and CDABA The concatination of 1st string twice is: ABACDABACD The 2nd string CDABA exists in the new string. Strings are rotations of each other 53. Write a Java program to match two strings where one string contains wildcard characters. Sample Output: The given string is: abcdhgh The given pattern string is: abc*d?* The given pattern is matching. 54. Write a Java program to find the smallest window in a string containing all characters of another string. Sample Output: The given string is: welcome to w3resource Characters to find in the main sring are: tower The smallest window which contains the finding characters is : to w3re 55. Write a Java program to remove all adjacent duplicates recursively from a given string. Sample Output: The given string is: aabaarbarccrabmq The new string after removing all adjacent duplicates is: brmq 56. Write a Java program to append two given strings such that, if the concatenation creates a double characters then omit one of the characters. Sample Output: The given strings are: food and door The string after concatination are: foodoor 57. Write a Java program to return a new string where the last two characters of a given string, if present, are swapped. Sample Output: The given strings is: string The string after swap last two characters are: strign 58. Write a Java program to read a string and return true if it ends in "ng". Sample Output: The given strings is: string The string containing ng at last: true The given strings is: strign The string containing ng at last: false 59. Write a Java program to read a string,if the string begins with "red" or "black" return that color string, otherwise return the empty string. Sample Output: The given strings is: blacksea The string begins with the color: black 60. Write a Java program to read two strings append them together and return the result. If the strings are different lengths, omit chars from the beginning of longer string and make them equal length. Sample Output: The given strings is: Welcome and home The new string is: comehome 61. Write a Java program to read a string and an int n, return a string made of the first and last n characters from the string. Sample Output: The given strings is: Welcome The given numbers is: 3 The new string is: Welome 62. Write a Java program to read a string and return true if "good" appears starting at index 0 or 1 in the given string. Sample Output: The given strings is: goodboy The 'good' appear in the string is: true 63. Write a Java program to return true from a given string if the first two characters in the string also appear at the end. Sample Output: The given strings is: educated The first two characters appear in the last is: true 64. Write a Java program to read a string and if a substring of length two appears at both its beginning and end, return a string without the substring at the beginning otherwise, return the original string unchanged. Sample Output: The given strings is: educated The new string is: ucated 65. Write a Java program to read a string and if the first or last characters are 't', return the string without those 't' otherwise return the string unchanged. Sample Output: The given strings is: testcricket The new string is: estcricke 66. Write a Java program to read a string and return the string without the first two characters.Except keep the first char if it is 'g' and keep the second char if it is 'h'. Sample Output: The given strings is: goat The new string is: gat he given strings is: photo The new string is: hoto The given strings is: ghost The new string is: ghost 67. Write a Java program to read a string and if one or both of the first tow characters is 'x', return without those 'x',otherwise return the string unchanged. Sample Output: The given strings is: oocyte The new string is: cyte The given strings is: boat The new string is: bat The given strings is: own The new string is: wn 68. Write a Java program to read a string and returns after remove the # and its immediate left and right characters. Sample Output: The given strings is: test#string The new string is: testring The given strings is: test##string The new string is: testring The given strings is: test#the#string The new string is: teshtring 69. Write a Java program to return the substring that is between the first and last appearance of the substring 'toast' in the given string,or return the empty string if substirng 'toast' does not exists. Sample Output: The given strings is: sweettoastbuttertoast The new string is: butter from a page by www.w3resource.com
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