Create a java method that reads from a text file and returns/makes a ragged array of doubles. The maximum rows is 10 and the maximum columns for each row is 10. Each row in the file is separated by a new line. Each element in the row is separated by a space.   The method signature is such: public static double[][] readFile(File f)

write a program that reads the students.txt file and stores the name of the student and the grade information as a student object in an arraylist sorts the students names based on their first grade in decreasing order using the selection sort algorithm writes the sorted list as the students last name , middle name (if theres one), first name , and grade information into a text file output example: Robison, Lee 95 80 Green, Alex R 85 60 Waston, Zoe G 100 80   use java

1. Write a program that calls a method that takes a character array as a parameter (you can initialize an array in the main method) and returns the number of vowels in the array. Partial program is given below. public class CountVowels{ public static void main(String[] args){ char[] arr= System.out.print("There are "+vowels(arr)+" vowels in the array");

In java   Browse Project Gutenberg (https://www.gutenberg.org/) for plain text versions of one or more works of literature of your choosing. Write a program that repeatedly searches a file for a target word or phrase.• Allow the user to supply the name of the file to search by means of a command-line argument; if the user does not supply a command line argument, ask for a file name interactively.• You may use either an array or an ArrayList to store each line in the file; but if you use an array, you’ll have to determine the array size (number of lines) before allocating the array. There are several ways to do this.• Report how many lines were read from the file.• Search for either individual words or phrases (Hint: use the .contains method, it’ll work for either a word or a phrase)• Show both the line number and the line itself for each line that contains the search target entered by the user (you may count the first line in the file as line 0).• If a search word is part of a larger…