Write a java class method named findFourLetterWord that searches an array of words (String objects) for a word that’s four characters long. The array will be the method’s only parameters. findFourLetterWord will return the first four-letter word that it finds. If none of the words have the proper length, the method will return null.

IN JAVA PLEASE

JAVA

Write a Java program tat prompts user for a list of integers with 0 as the last value.Save the values in an array. Assume there can be maximum 100 values. Theprogram should have the following methods:- A method that takes the array as parameter and updates each value in thearray to the square of the value.- Another method that takes the original and modified arrays as parametersand displays the original and the squared values.

Write a program named GradeStats.java then implement the following method: public static int[] gradeStats(int[] arr) It accepts int array representing test grades for CISY432 then calculates and returns the following grade statictics: highest, lowest, average, number of grades that are greater than or equal to 70, the number of grades that are less than 70 It returns these five numbers as an int array, and the 1st element is for highest, 2nd for lowest, 3rd for average 4th element for number of grades that are greater than or equal to 70 5th for the number of grades that are less than 70 For example. O Type here to search DELL

modify it to create a classthat contains a static method; the method takes a string as a parameter andreturns a boolean value indicating whether the parameter string has repeatedcharacters in it or not. That is, return true if there is at least one characterwhich appear more than once in the string. The string should be input by the user   public class Qns3 {public static void main(String args[]) { //input.Scanner Input = new Scanner(System.in);System.out.println ( "Enter the String to check for duplicate characters:");String k = Input.next();// repeated = true.boolean Repeat = false;for (int i = 0; i < k.length(); i++)for (int j = i + 1; j < k.length(); j++)if (k.charAt(i) == k.charAt(j))Repeat=true;if (Repeat){System.out.println("String have repeated characters" +k);}elseSystem.out.println( "String have no repeated characters" +k);} }

Task 2: Write a static method which takes an ArrayList of Strings and an integer and changes the ArrayList destructively to remove all Strings whose length is less than the integer argument. So if the integer argument is 4 and the ArrayList is: tomato cheese chips fruit butter tea buns pie The output tomato cheese chips fruit butter is:

An incomplete program named w_pl java, which must include three methods, is provided. You must implement two methods within the program as described below. The third method, which is a main method, is already written in the program and you can use it to test your program. The two methods you mast inplement are: • find method • Signature: public statie vold find(int[] a, int x) • Behavior: • Reccives an array of integers a and an integer x • Performs a linear search on a for x. • If x is in a, print the indexes of the aray slots where x is stored (there may be multiple x's in a) on the screen. • Ifx is not in a, print the message "x does not exist" on the screen. Note that you should not use Java's built-in method. Your program must scan and search the array. • isPrifie method • Signature: public statie boolean isPrefix(String s1, String s2) • Behavior: • Receives two strings sl and s2. Assume that length of sl length of s2. Returns true if sl is a prefix of s2 and returns false…

Write a class method named countOccurences that returns the number of times a particular integer occurs in an array of integers. The integer and the array will both be parameters.

Create a class called StudentBirthYear. It should only have two members, both of them arrays. One of type string called Names. The second of type int called BirthYears. Now in your main class create a StudentBirthYear object. Make sure both arrays are of the size 13. Add thirteen different names and thirteen different birth years. Then display each name with its birth year using only 1 for loop. Only use a for loop, no other kind of loop.