Create a class called "Session12Lab". Create a method public static String[] mergeArrays(String[] arr1, String[] arr2) where arr1 and arr2 are two String[]. The method should return one String[] array which is the concatenation of arr1 and arr2. Test this out in the class' main() method

Please read the instructions carefully and keep in mind of the bolded phrases. You are NOT ALLOWED to use HashSet Create a project in NetBeans and name the project Hw06. The class will contain the following static methods: reverseS – A method that displays a string reversely on the console using the following signature: publicstaticvoidreverseS(Strings) printSub1 – print all substrings of a string (duplicated substrings are allowed, but loops are not allowed). The method signature: public static void printSub1(String s)   printSub2 – print all substrings of a string (duplicated substrings are not allowed, but loops are allowed). The method signature:   public static void printSub2(String s)   Note: All methods should be RECURSIVE. Any predefined classes that are based on Set are not allowed. In the main method, read a string from the user and output the reversed string and substrings to the screen: Sample Run: Please input a string: abcdThe reversed string: dcbaThe substrings…

You will also have to write Student Tests that test the following in the provided file.i. Adding element(s).ii. Get elements at index – (1) with a valid index and (2) with an invalid indexiii. Test equality of two StringArrayLists (of size 0, 2)iv. Test if a StringArrayList contains a String (test both true and false cases)v.Test removing a String from a StringArrayList.

Modify the NumbersDemo application whose main() method holds two integer variables. Assign values to the variables. In turn, pass each value to methods named displayTwiceTheNumber(), displayNumberPlusFive(), and displayNumberSquared(). Create each method to perform the task its name implies.   public class NumbersDemo {     public static void main (String args[]) {         // Write your code here     }     public static void displayTwiceTheNumber(int n) {         // Write your code here     }     public static void displayNumberPlusFive(int n) {         // Write your code here     }     public static void displayNumberSquared(int n) {         // Write your code here     } }

Write a public static method named allLessThanMean that will take an ArrayList<Integer> as an argument. This method will return an ArrayList<Integer>. When called and passed anArrayList, this method will return an ArrayList containing all the elements in the argument ArrayList that are less than the average of all the values in the argument ArrayList. The values in the returned ArrayList must be in the same order as they are in the argument ArrayList. Here are some examples: Example 1 Given: ArrayList<Integer> myList = new ArrayList<Integer>(); with these values {1, 2, 3, 4, 5}; allLessThanMean(myList) should return an ArrayList<Integer> with these values {1, 2} Example 2 Given: ArrayList<Integer> myList = new ArrayList<Integer>(); with these values {3, 7, 6, 2, 9, 0, 4, 8}; allLessThanMean(myList) should return an ArrayList<Integer> with these values {3, 2, 0, 4} Example 3 Given: ArrayList<Integer> myList = new…

You have to use comment function to describe what each line does    import java.io.BufferedReader; import java.io.FileNotFoundException; import java.io.FileReader; import java.io.IOException; import java.util.ArrayList; import java.util.Arrays; import java.util.List;   public class PreferenceData {   private final List<Student> students; private final List<Project> projects; private int[][] preferences;   private static enum ReadState { STUDENT_MODE, PROJECT_MODE, PREFERENCE_MODE, UNKNOWN; };   public PreferenceData() { super(); this.students = new ArrayList<Student>(); this.projects = new ArrayList<Project>(); }   public void addStudent(Student s) { this.students.add(s); }   public void addStudent(String s) { this.addStudent(Student.createStudent(s)); }   public void addProject(Project p) { this.projects.add(p); }   public void addProject(String p) { this.addProject(Project.createProject(p)); }   public void createPreferenceMatrix() { this.preferences = new…

New JAVA code can only be added between lines 9 and 10, as seen in image.

1. Complete the class code below and include a method named "search" that takes two String parameters, a string to search and the other a target string to search for in the first string. The search method will return an integer representing the number of times the search string was found. The string being searched is a super-string formed by joining all lines of a text file, so we might expect to get multiple hits with our method. HINT: walk the String in a loop and use .substring(start, end) to examine a target-sized segment of the input string for equality to your target word. public class WordSearch { public static void main(String[] args) { String fileName String target = "help"; Scanner fileln = new Scanner(new File(fileName)); "story.txt"; %D String story = while(fileln.hasNextLine()) { story += fileln.nextLine(); // Build a super-String } System.out.printIn("(" + target + ") found "+ search(story, target) + " times"); } /l method code here } // end of WordSearch class

This is the code: String name = Doe, John"; int index =name.indexOf(" , "); String firstName= name.substring(index + 2, name.length()); System.out.println(firstName);

In JAVA, use a HashMap to count and store the frequency counts for all the words from a large text document. Then, display the contents of this HashMap with given words and their frequency in the document. Next, please create a set view of the Map and store the contents in an array. Sort this array based on key value and display it. Finally, sort the array in decreasing order by frequency and display it.