gamer3425

The prompt is as follows:

Write a program that prompts the user to enter the number of students in a class, the student names and their scores on a test. The program should print the student names (along with their scores) in decreasing order of their scores (use the selection sort as covered in class). Your sort should be implemented as a method (please see the following method header):

Here is my code:

public class Assignment5 {

/**

* @param args

*/

public static void main(String[] args) {

Scanner input = new Scanner(System.in);

System.out.println("Enter the size of the class: ");

int size = input.nextInt();

String[] names = new String[size];

double[] scores = new double[size];

for (int i = 0; i < size; i++) {

System.out.print("Please enter a student name: ");

input.useDelimiter(System.getProperty("line.separator"));

names[i] = input.next();

System.out.print("Please enter " + names[i] + "'s score: ");

scores[i] = input.nextDouble();

}

System.out.println("The class size is " + size);

SelectionSort(scores, names);

}

public static void SelectionSort (double[] score, String[] name) {

Scanner myInput = new Scanner(System.in);

for (int i = 0; i < score.length; i++) {

// This finds the minimum in the list.

double currentMin = score[i]; // Minimum = position in the list.

int currentMinIndex = i; // Index of the current minimum.

for (int j = i + 1; j < score.length; j++) {

if (currentMin < score[j]) {

currentMin = score[j];

currentMinIndex = j;

}

}

if (currentMinIndex != i) {

score[currentMinIndex] = score [i];

score[i] = currentMin;

}

}

System.out.println("Name Score");

for (int i = 0; i < score.length; i++) {

System.out.print(name[i] + score[i]);

System.out.println();

}

}

}

Now the problem is that when it does the sort, it doesn't put the grade with its associated score. What do I do to correct this problem?

The assignment is to create a class called MyInteger that contains the following:

• An int data field named value that stores the int value of an integer.

• A constructor that creates a MyInteger object for the specified int value.

• A get method that returns the int value.

• A method, isPrime() that returns true if the value is a prime number. See section 4.10 of the text for Java code that detects prime numbers (this may vary depending on the edition you have).

• A static, isPrime(MyInteger) that returns true if the value is a prime number. Note that this method takes an object reference variable (rather than the value) as a parameter.

The output should look like this:

Testing Instance method, is Prime

isPrime: 997 is prime

-----------------------------------

Testing Class method (that takes a reference variable)is Prime

isPrime: 997 is prime

Testing Instance method, is Prime

isPrime: 998 is not prime

-----------------------------------

Testing Class method (that takes a reference variable)is Prime

isPrime: 998 is not prime

My code is as follows:

public class Assignment4 {

/**

* @param args

*/

static boolean isPrime(int value) {

boolean prime = true;

//check to see if the number is prime

for(int j=2; j <= value / 2; j++)

if (value % j == 0) {

prime = false;

}

return prime;

}

public static void main(String[] args) {

MyInteger number = new MyInteger(997);

if (isPrime(997)) {

System.out.println(number + " is prime.");

}

}

class MyInteger {

int value = 1;

MyInteger() {

this(1);

}

MyInteger(int number) {

value = number;

}

public boolean isPrime() {

boolean prime = true;

//check to see if the number is prime

for(int j=2; j <= value / 2; j++)

if (value % j == 0) {

prime = false;

}

return prime;

}

// Accessor that returns value.

public int getValue() {

return value;

}

}

}

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