Select all true statements   import java.io.File; import java.util.Scanner;   public class DirectorySize {   public static void main(String[] args) {     // Prompt the user to enter a directory or a file     System.out.print("Enter a directory or a file: ");        Scanner input = new Scanner(System.in);     String directory = input.nextLine();         // Display the size     System.out.println(getSize(new File(directory)) + " bytes");   }     public static long getSize(File file) {     long size = 0; // Store the total size of all files       if (file.isDirectory()) {       File[] files = file.listFiles();        for (int i = 0; files != null && i < files.length; i++) {         size += getSize(files[i]); // Recursive call       }     }     else { // Base case       size += file.length();     }       return size;   } }   a. The length() method returns the size of a file.   b. The listFiles() method returns an array of File objects and excludes each directory.   c. The length() method returns a value of -1 if the file is a directory.   d. The listFiles() method returns an array of File objects under a directory.

you must create the data files with a text tool, such as Notepad exampleThree   In the while loop, this program reads fileLoop.txt until all items are read   package hasnext;   import java.util.Scanner; import java.io.*; // public class Hasnext {   public static void main(String[] args) throws IOException     {         File loopfile = new File("fileLoop.txt");              Scanner getAll = new Scanner( loopfile );            // connect a Scanner to the file     int num = 0, square = 0;         while(getAll.hasNextInt())     {       num = getAll.nextInt();       square = num * num ;             System.out.println("The square of " + num + " is " + square);     }     getAll.close();     }     }

Write a program that reads a file one character at a time and prints out how many characters are uppercase letters, lowercase letters, digits, white space, and something else. Characters.java 1 import java.io.File; 2 import java.io.FileNotFoundException; 3 import java.io.PrintWriter; 4 import java.util.Scanner; 5 6 public class Characters 7 { 8 public static void main(String[] args) throws FileNotFoundException { Scanner console = new Scanner(System.in); System.out.print("Input file: "); String inputFileName int uppercase int lowercase 9 10 11 12 console.next( ); 0; 0; 0; = 0; 0; 13 %3D 14 %3D int digits int whitespace int other 15 16 17 %D 18 while (. { 19 .) 20 21 if (. else if (. else if (. else if (. else other++; 22 .) { uppercase++; } .) { lowercase++; } .) { digits++; } .) { whitespace++; } 23 24 25 26 27 } 28 System.out.println("Uppercase: System.out.println("Lowercase: System.out.println("Digits: System.out.println("Whitespace: System.out.println("0ther: } + uppercase); +…

createDatabaseOfProfiles(String filename) This method creates and populates the database array with the profiles from the input file (profile.txt) filename parameter. Each profile includes a persons' name and two DNA sequences. 1. Reads the number of profiles from the input file AND create the database array to hold that number profiles. 2. Reads the profiles from the input file. 3. For each person in the file 1. creates a Profile object with the information from file (see input file format below). 2. insert the newly created profile into the next position in the database array (instance variable).