please update generateRandoms, letterToGrades, sumBetween, countCharacters //A6Utilities.java import java.io.IOException; import java.nio.file.Files; import java.nio.file.Paths; import java.security.SecureRandom; import java.util.List; import java.util.TreeMap; import java.util.function.Function; import java.util.stream.Collectors; public class A6Utilities { /** * Returns the corresponding letter grade. Don't modify this method, simply use it when converting single * grades to their equivalent letter grade * * @param grade the integer grade to convert * @return the letter grade equivalent to the integer grade */ private static char letterGrade(final int grade) { if (grade < 0) return '?'; else if (grade < 60) return 'F'; else if (grade < 70) return 'D'; else if (grade < 80) return 'C'; else if (grade < 90) return 'B'; else if (grade <= 100) return 'A'; else return '?'; } /** * The method uses Java Streams only. Don't use any looping structures, conditional statements are OK (IF, TERNARY, SWITCH) * * Generates a list of secure random numbers using java.security.SecureRandom: * 1. Random numbers between min and max: * 2. The number of randoms is equal to poolSize * 3. The list is sorted * * @param min the minimum random number range * @param max the maximum random number range * @param poolSize the number of random numbers to generate * @return a sorted list of random numbers between min and max and size poolSize */ public static List generateRandoms(final int min, final int max, final int poolSize) { return null; } /** * The method uses Java Streams only. Don't use any looping structures, conditional statements are OK (IF, TERNARY, SWITCH) * * Receives a list of grades and returns a list of corresponding letter grades. Use the private letterGrade method * * @param listGrades the list of grades to convert * @return a list of corresponding letter grades */ public static List letterToGrades(final List listGrades) { return null; } /** * The method uses Java Streams only. Don't use any looping structures, conditional statements are OK (IF, TERNARY, SWITCH) * * Returns the sum of values within the listInt parameter between sumFrom and sumTo (inclusive). The method throws an IllegalArgumentException * with message "Incorrect parameters" if sumFrom is larger than sumTo, or if sumFrom and sumTo are outside the list's ranges * * @param listInt a list of integer values * @param sumFrom the starting sum position * @param sumTo the end sum position * @return the sum of values between the parameters sumFrom and sumTo */ public static int sumBetween(final List listInt, final int sumFrom, final int sumTo) throws IllegalArgumentException { return - 9999; } /** * The method uses Java Streams only. Don't use any looping structures, conditional statements are OK (IF, TERNARY, SWITCH) * * Returns a count of each character within the provided text file. This question is a simpler version of the example * in Section 17.13 (slide 177) * * @param fileName the file to count the characters for * @return each character and its count * @throws IOException thrown if the file read operation fails */ public static TreeMap countCharacters(final String fileName) throws IOException { return null; } }
please update generateRandoms, letterToGrades, sumBetween, countCharacters
//A6Utilities.java
import java.io.IOException;
import java.nio.file.Files;
import java.nio.file.Paths;
import java.security.SecureRandom;
import java.util.List;
import java.util.TreeMap;
import java.util.function.Function;
import java.util.stream.Collectors;
public class A6Utilities {
/**
* Returns the corresponding letter grade. Don't modify this method, simply use it when converting single
* grades to their equivalent letter grade
*
* @param grade the integer grade to convert
* @return the letter grade equivalent to the integer grade
*/
private static char letterGrade(final int grade) {
if (grade < 0) return '?';
else if (grade < 60) return 'F';
else if (grade < 70) return 'D';
else if (grade < 80) return 'C';
else if (grade < 90) return 'B';
else if (grade <= 100) return 'A';
else return '?';
}
/**
* The method uses Java Streams only. Don't use any looping structures, conditional statements are OK (IF, TERNARY, SWITCH)
* <p>
* Generates a list of secure random numbers using java.security.SecureRandom:
* 1. Random numbers between min and max:
* 2. The number of randoms is equal to poolSize
* 3. The list is sorted
*
* @param min the minimum random number range
* @param max the maximum random number range
* @param poolSize the number of random numbers to generate
* @return a sorted list of random numbers between min and max and size poolSize
*/
public static List<Integer> generateRandoms(final int min, final int max, final int poolSize) {
return null;
}
/**
* The method uses Java Streams only. Don't use any looping structures, conditional statements are OK (IF, TERNARY, SWITCH)
* <p>
* Receives a list of grades and returns a list of corresponding letter grades. Use the private letterGrade method
*
* @param listGrades the list of grades to convert
* @return a list of corresponding letter grades
*/
public static List<Character> letterToGrades(final List<Integer> listGrades) {
return null;
}
/**
* The method uses Java Streams only. Don't use any looping structures, conditional statements are OK (IF, TERNARY, SWITCH)
* <p>
* Returns the sum of values within the listInt parameter between sumFrom and sumTo (inclusive). The method throws an IllegalArgumentException
* with message "Incorrect parameters" if sumFrom is larger than sumTo, or if sumFrom and sumTo are outside the list's ranges
*
* @param listInt a list of integer values
* @param sumFrom the starting sum position
* @param sumTo the end sum position
* @return the sum of values between the parameters sumFrom and sumTo
*/
public static int sumBetween(final List<Integer> listInt, final int sumFrom, final int sumTo) throws IllegalArgumentException {
return - 9999;
}
/**
* The method uses Java Streams only. Don't use any looping structures, conditional statements are OK (IF, TERNARY, SWITCH)
* <p>
* Returns a count of each character within the provided text file. This question is a simpler version of the example
* in Section 17.13 (slide 177)
*
* @param fileName the file to count the characters for
* @return each character and its count
* @throws IOException thrown if the file read operation fails
*/
public static TreeMap<Character, Long> countCharacters(final String fileName) throws IOException {
return null;
}
}
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