Question

1. Create a new class called ReversibleArray.

2. In the class header, add the code <T> immediately to the right of the class name.

3. Give this class two private instance variables: T[] array and int count

4. Create a constructor which takes in one parameter of type T[] and assign that parameter's value into this.array. Set count as the length of the array.

5. Add a toString() method that outputs the array values in the format: elem0, elem1, elem2, etc. (hint: add the comma and space only if you are not on the final iteration of the loop).

6. Create the most important function in this class: public void reverse () { } a. This method must swap elements within the array, without making a new array or other collection. b. The swaps should be made symmetrically about the middle of the array. This means array[0] swaps with array[n-1], array[1] swaps with array[n-2], etc. c. Use a temp variable to help with these swaps. What variable type should this temp variable be? d. How many swaps must be made to correctly reverse the array?

7. Open TestReverse.java and read over the code in its main() function.

8. Run TestReverse to see the output. If your output is incorrect, then debug the program until it works properly. It should print out the following text: atom, breeze, clock, daydream, energy energy, daydream, clock, breeze, atom 11, 22, 33, 44, 55, 66, 77 77, 66, 55, 44, 33, 22, 11 Jerry Seinfeld, Salma Hayek, Reese Witherspoon, Vince Vaughn Vince Vaughn, Reese Witherspoon, Salma Hayek, Jerry Seinfeld

Answer 1

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//NOTE: YOU CAN COMMENT THIS LINE OR REMOVE THIS FROM THE CODE IF YOU DONT WANT TO SEE THE NUMEBR OF SWAPS

       System.out.println("Total swaps: " + j);

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CODE TO COPY

public class ReversibleArray<T> {
   T[] array;
   int count;

   public ReversibleArray(T[] array) {
       this.array = array;
       count = array.length;
   }

   @Override
   public String toString() {
       String s = "";
       for (int i = 0; i < array.length; i++) {
           if (i != array.length - 1) {
               s += array[i] + ", ";
           } else {
               s += array[i];
           }
       }
       return s;
   }

   public void reverse() {
       int j = 0;
       int x = array.length;
       for (int i = 0; i < x; i++) {
           T temp = array[i];
           array[i] = array[x - 1];
           array[x - 1] = temp;
           x--;
           j++;
       }
       System.out.println("Total swaps: " + j);
   }
}

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public class TestReverse {

   public static void main(String[] args) {

       String[] arr = new String[] { "atom", "breeze", "clock", "daydream", "energy" };
       ReversibleArray<String> a = new ReversibleArray<String>(arr);
       System.out.println(a.toString());
       a.reverse();
       System.out.println(a.toString());

       System.out.println("============================");

       Integer[] arr1 = new Integer[] { 11, 22, 33, 44, 55, 66, 77 };
       ReversibleArray<Integer> a1 = new ReversibleArray<Integer>(arr1);
       System.out.println(a1.toString());
       a1.reverse();
       System.out.println(a1.toString());

       System.out.println("============================");

       String[] arr2 = new String[] { "Jerry Seinfeld", "Saalma Hayek", "Reese", "Witherspoon", "Vince" };
       ReversibleArray<String> a2 = new ReversibleArray<String>(arr2);
       System.out.println(a2.toString());
       a2.reverse();
       System.out.println(a2.toString());
   }

}

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EPXLANATION

public class ReversibleArray<T> { // Creating a new class called ReversibleArray.

//creating two private instance variables: T[] array and int count
   T[] array;
   int count;

   public ReversibleArray(T[] array) { // constructor which takes in one parameter of type T[]
       this.array = array; // assigning the parameter's value into this.array
       count = array.length; //Set count as the length of the array
   }

//Add a toString() method
   @Override
   public String toString() {
       String s = ""; //to store the string

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

           if (i != array.length - 1) { // if you are not on the final iteration of the loop
               s += array[i] + ", "; //add the comma and space
           } else {
               s += array[i]; // dont add space or comma at the end
           }
       }
       return s; //return the ouput
   }

   public void reverse() {
       int j = 0; // to keep count of number of swaps
       int x = array.length; // to store last element number
       for (int i = 0; i < x; i++) { //iterate through all elements
           T temp = array[i]; // store array[i] in temp
           array[i] = array[x - 1]; // swap with last element
           array[x - 1] = temp;// swap with element stored in temp
           x--; // shift from last element to last second and so on...
           j++; // increment number of swaps
       }
       //NOTE: YOU CAN COMMENT THIS LINE OR REMOVE THIS IF YOU DONT WANT TO SEE THE NUMEBR OF SWAPS
       System.out.println("Total swaps: " + j); //print the swaps count
   }
}

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public class TestReverse { // CREATING A CLASS TestReverse

   public static void main(String[] args) { //CREATING A main METHOD

//CREATING A ARRAY arr to store words
       String[] arr = new String[] { "atom", "breeze", "clock", "daydream", "energy" };
//creating a object a with and passing arr
       ReversibleArray<String> a = new ReversibleArray<String>(arr);
//printing all the elements in a
       System.out.println(a.toString());
//reversing array
       a.reverse();
//printing the reversed array
       System.out.println(a.toString());

//printing line
       System.out.println("============================");

//CREATING A ARRAY arr1 to store words
       Integer[] arr1 = new Integer[] { 11, 22, 33, 44, 55, 66, 77 };
//creating a object a1 with and passing arr
       ReversibleArray<Integer> a1 = new ReversibleArray<Integer>(arr1);
//printing array a1
       System.out.println(a1.toString());
//reversing array
       a1.reverse();
//printing array a1 after reversing
       System.out.println(a1.toString());

//printing line
       System.out.println("============================");

//CREATING A ARRAY arr2 to store words
       String[] arr2 = new String[] { "Jerry Seinfeld", "Saalma Hayek", "Reese", "Witherspoon", "Vince" };
//creating a object a2 with and passing arr
       ReversibleArray<String> a2 = new ReversibleArray<String>(arr2);
//printing array a2 elements
       System.out.println(a2.toString());
//reversing array
       a2.reverse();
//printing array a2 after reversing
       System.out.println(a2.toString());
   }

}

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3 46 un 6 7 8 9 ReversibleArray.java TestReverse.java X 1 2 public class TestReverse el public static void main(String[] args) { String[] arr = new String[] { "atom", "breeze", "clock", "daydream", "energy" }; ReversibleArray<string> a = new ReversibleArray<string> (arr); System.out.println(a.tostring(); a.reverse(); System.out.println(a.tostring(); System.out.println("====== ==="); Integer[] arri = new Integer[] { 11, 22, 33, 44, 55, 66, 77 }; ReversibleArrayInteger al = new ReversibleArrayInteger>(arri); System.out.println(a1.toString(); al.reverse(); 18 System.out.println(ai.tostring(); System.out.println("----- ==========='); String[] arr2 = new String[] { "Jerry Seinfeld", "Saalma Hayek", "Reese", "Witherspoon", "vince" }; ReversibleArray<string> a2 = new ReversibleArray<string> (arr2); 24 System.out.println(a2.toString(); 25 a2.reverse(); 26 System.out.println(a2.tostring(); 27 28 296 30 10 11 12 13 14 15 16 17 19 20 21 22 23

ReversibleArray.java X TestReverse.java 1 2 public class ReversibleArray<t> ] T[] array; int count; public ReversibleArray ( [] array) { this.array = array, count = array.length; 9 3 4 un 60 7 8 فيه @Override public String tostring() { strings = ""; for (int i = 0; i < array.length; i++) { if (i != array.length - 1) { += array[i] } else { 5 += array[i]; } } return s; سهه 10 110 A12 13 14 15 16 17 18 19 20 21 22 23 240 25 26 27 28 29 30 31 32 33 34 35 36 | public void reverse() { int j = 0; int x = array.length; for (int i = 0; i < x; i++) { T temp = array[i]; array[i] = array[x - 1); array[x - 1] = temp; j++; } System.out.println("Total swaps: + 1); فيه

Console X <terminated> TestReverse [Java Application] C:\Program Files\Java\jdk-12.0.1\bin\javaw.exe btom, breeze, clock, daydream, energy Total swaps: 3 energy, daydream, clock, breeze, atom ============================ 11, 22, 33, 44, 55, 66, 77 Total swaps: 4 77, 66, 55, 44, 33, 22, 11 Jerry Seinfeld, Saalma Hayek, Reese, witherspoon, vince Total swaps: 3 vince, Witherspoon, Reese, Saalma Hayek, Jerry Seinfeld

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