Write a recursive method named contains with the following header: public static boolean contains(String haystack, String needle) The method should return true if needle is contained within haystack and false if needle is not in haystack.
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In Java
Write a recursive method named contains with the following header:
public static boolean contains(String haystack, String needle)
The method should return true if needle is contained within haystack and false if needle is not in haystack.
For example,
contains("JavaYou are not allowed to use the substring method to find a match.
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- The intName method in the "Problem Solving: Stepwise Refinement" section accepted arguments < 1,000. Using a recursive call, extend its range to 999,999. For example an input of 12,345 should return " twelve thousand three hundred forty five". Note that some number names may have extra spaces at the beginning or end. import java.util.Scanner; public class IntegerName { /** Turns a number into its English name. @param number a positive integer < 999,999 @return the name of the number (e.g. "two hundred seventy four") */ public static String intName(int number) { int part = number; // The part that still needs to be converted String name = ""; // The name of the number if (part >= 1000) { // Recursively call intName } if (part >= 100) { name = digitName(part / 100) + " hundred"; part = part % 100; } if (part >= 20) { name = name + " " + tensName(part); part = part % 10; } else if (part >= 10) { name = name + " " + teenName(part); part = 0; } if (part > 0) { name =…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 a recursive method that displaysa string reversely on the console using the following header: public static void reverseDisplay(String value) For example, reverseDisplay("abcd") displays dcba. Write a test programthat prompts the user to enter a string and displays its reversal.
- Question 12 kana .Write a single method that recursively prints the following (Yes, there is a 13 between the 2 14s): in Java 1 2 3 4 5 6 7 8 9 10 11 12 14 13 14 12 11 10 9 8 7 6 5 4 3 2 1 Full explain this question and text typing work only We should answer our question within 2 hours takes more time then we will reduce Rating Dont ignore this line• Write a recursive method to complete the class BaseRaiseToN. • The method: public static int raiseBToN(int base, int exp) computes and returns the value of Bn using recursion.• What value/values of n will stop the recursion (base case)?• A precondition of this method is that B be a positive number greater than zero Sample Output Enter the base4Enter the exponent 3 4 to 3 is 64Write a recursive method called digitCount() that takes a positive integer as a parameter and returns the number of digits in the integer. Hint: The number of digits increases by 1 whenever the input number is divided by 10. Use Java. Ex: If the input is: 345 the method digitCount() returns and the program outputs: 3 Ex: If the input is: 0 the method digitCount() returns and the program outputs: 1 import java.util.Scanner; public class LabProgram {/* TODO: Write recursive digitCount() method here. */public static void main(String[] args) {Scanner scnr = new Scanner(System.in);int num, digits;num = scnr.nextInt();digits = digitCount(num);System.out.println(digits);}}
- Write a recursive Java method that takes a String as a parameter and returns true if the String is a palindrome. You may assume that the string only contains lower case characters (i.e. no numbers, spaces, punctuation, etc).The nth harmonic number is defined non-recursively as H(n) = 1+1/2+1/3+1/4+⋯+1/n Come up with a recursive definition and use it to guide you to write a method definition for a double-valued method named “harmonic” that accepts an int parameter n and recursively calculates and returns the nth harmonic number. Write a test program that displays the harmonic numbers, H(n), for n = 1,2,3,⋯,10.Write a recursive method that parses a binary number as astring into a decimal integer. The method header is public static int bin2Dec(String binaryString) Write a test program that prompts the user to enter a binary string and displaysits decimal equivalent.
- You have a card on which the letter J is written on one side and K on the other. You want to seeall of the possible ways the card will land if you drop it n times. Write a recursive method thatprints each session of dropping the cards with J's and K's. For example if you drop it 4 times in agiven session, all possible ways to drop it are as follows (in exactly the specified order): (java code)The “odd/even factorial” of a positive integer n is represented as n!! and is defined recursively as: a. (n)*(n-2)*(n-4)………*(2) if n is even. For example, 6!! = 6*4*2 = 48 b. (n)*(n-2)*(n-4)*…….*(5)*(3)*(1) if n is odd. For example, 7!! = 7*5*3*1 = 105. Come up with a recursive definition for n!! and use it to guide you to write a method definition for a method called “oddevenfact” that recursively calculates the odd/even factorial value of its single int parameter. The value returned by “oddevenfact” is a long.1. Let product(n,m) be a recursive method that computes the product of two positive integers, using only addition and subtraction. To make this method a recursive one, you are to make a) a base case when m = 1, b) a general case when m ≠ 1. For a general case, the return value should be n plus the result of a recursive call to the method product() with parameters n and m - 1. Write a short Java code for this method, along with a test program.