Write a recursive method tripleChar(String s. char c) that takes a string s and a character c. The method returns the string s with all the occurrences of c repeated 3 times.
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- JAVA Write a static recursive method evenFactors that takes as input two positive integers and prints the even factors of the first integer that are greater than or equal to the second integer. For example, evenFactors(18,1) prints 2, 6, and 18, since the even factors of 18 that are greater than or equal to 1 are 2,6, and 18.Write a recursive method to print all the permutations of astring. For example, for the string abc, the permutation isabcacbbacbcacabcba public static void displayPermutation(String s)public static void displayPermutation(String s1, String s2)The first method simply invokes displayPermutation(" ", s). The secondmethod uses a loop to move a character from s2 to s1 and recursively invokesit with new s1 and s2. The base case is that s2 is empty and prints s1 to theconsole.Write a test program that prompts the user to enter a string and displays all itspermutations.Write a recursive method that will remove all the special characters from agiven string and return what is left as a new string. (Hint: Use the + operatorto perform string concatenation to construct the string that is returned.)
- Write a recursive method thatfinds the number of occurrences of a specified letter in a string using the followingmethod header: public static int count(String str, char a) For example, count("Welcome", 'e') returns 2. Write a test program thatprompts the user to enter a string and a character, and displays the number ofoccurrences for the character in the string.Write a static recursive method that returns the number of digits in theinteger passed to it as an argument of type int. Allow for both positiveand negative arguments. For example, –120 has three digits. Do not countleading zeros. Embed the method in a program, and test it.Write recursive methods for the following operations: • removeDup(String s): takes string s and returns another string r constructed from s after removing all duplicates. For example, when s = "pineapples", r will be "pineals". • intersection(String s1, String s2): takes two duplicate-free strings and returns the string consisting of all letters that appear in both s1 and s2. • union(String s1, String s2): takes two duplicate-free strings and returns the string consisting of all letters that appear in either s1 or s2. • difference(String s1, String s2): takes two duplicate-free strings and returns the string consisting of all letters that appear only in s1. For example, when s1 = "aples" and s2 = "pears", intersection(s1, s2) will return "apes", union(s1, s2) will "aplesr", and difference(s1, s2) "l". Calling method removeDup() is not allowed in intersection(s1, s2) , union(s1, s2) or difference(s1, s2) method. Your program should check strings are duplicate free before they are…
- Write a program that will contain the following methods: printSub1, printSub2, printSub3, printSub4 – print all substrings of S using recursion. For example, if S = "abcd": printSub1 will print "a", "ab", "abc", "abcd", "b", "bc", "bcd", "c", "cd", "d" printSub2 will print "d", "cd", "bcd", "abcd", "c", "bc", "abc", "b", "ab", "a" printSub3 will print "a", "b", "c", "d", "ab", "bc", "cd", "abc", "bcd", "abcd" printSub4 will print "abcd", "bcd", "abc", "cd", "bc", "ab", "d", "c", "b", "a" Note that the actual output will not have quotation marks around the substrings. The substrings must print in the order shown for each method. You may only use these String methods in your work: length(), substring() Your main method in this program should provide an appropriate menu which allows the user the enter the string of their choice and pick any of the print substring options they want. IN JAVAWrite a program that will contain the following methods: printSub1, printSub2, printSub3, printSub4 – print all substrings of S using recursion. For example, if S = "abcd": printSub1 will print "a", "ab", "abc", "abcd", "b", "bc", "bcd", "c", "cd", "d" printSub2 will print "d", "cd", "bcd", "abcd", "c", "bc", "abc", "b", "ab", "a" printSub3 will print "a", "b", "c", "d", "ab", "bc", "cd", "abc", "bcd", "abcd" printSub4 will print "abcd", "bcd", "abc", "cd", "bc", "ab", "d", "c", "b", "a" Note that the actual output will not have quotation marks around the substrings. The substrings must print in the order shown for each method. You may only use these String methods in your work: length(), substring() Your main method in this program should provide an appropriate menu which allows the user the enter the string of their choice and pick any of the print substring options they want. write the methods recursively and in javaDo not use static variables to implement recursive methods. USING JAVA: // P6 public static int countSubstrings(String s1, String s2) { } Write a recursive method countSubstrings that counts the number of non-overlapping occurrences of a string s2 in a string s1. Use the method indexOf() from String class. As an example, with s1=”abab” and s2=”ab”, countSubstrings returns 2. With s1=”aaabbaa” and s2=”aa”, countSubstrings returns 2. With s1=”aabbaa” and s2=”AA”, countSubStrings returns 0. Show the output on the following strings: s1 = “Java is a programming language originally developed by James Gosling at Sun Microsystems and released in 1995 as a core component of Sun Microsystems Java platform. The language derives much of its syntax from C and C++ but has a simpler object model and fewer low-level facilities. Java applications are typically compiled to bytecode (class file) that can run on any Java Virtual Machine (JVM) regardless of computer architecture.…
- Write a recursive method called doubleDigits that accepts an integer n as a parameter and returns the integer obtained by replacing every digit of n with two of that digit. For example, doubleDigits(348) should return 334488. The call doubleDigits(0) should return 0. Calling doubleDigits on a negative number should return the negation of calling doubleDigits on the corresponding positive number; for example, doubleDigits(–789) should return –778899.Write a static recursive method in Java called mrecursiv that displays all of the permutations of the charactersin a string passed to the method as its argument. For example, the character sequence abc has thefollowing permutations: acb, bac, bca, cab, cba. Then Write a static method called getInput that get aninput string from the user and passed it to the mrecursiv method written above in a method call.Write a static recursive method in Java called mRecursion that displays all of the permutations of the charactersin a string passed to the method as its argument. For example, the character sequence abc has thefollowing permutations: acb, bac, bca, cab, cba. Then Write a static method called getInput that get aninput string from the user and passed it to the mRecursion method written above in a method call.Please does so using what I already had //Get input from in to call recursive method //to display those char permutations public static String getInput ( ) { Scanner in = new Scanner(System.in); String combination = in.nextLine(); System.out.println("Enter string:); return stringComb; //Method to show permutations of a desired string// This only return 3 string combination for some reason static void myRecursion(String aString) { //isEmpty check if ( aString.length() == 0){…