Implement a GENERIC Class named MagicBox Write a generic method to exchange the

Question

Implement a GENERIC Class named MagicBox

Write a generic method to exchange the positions of two different elements in a list

Write a generic method that will count the occurrences of an item in the list

YOU MUST USE GENERICS!

Test your program with the following code

public class CountTest {

    public static void main(String[] args) {

    MagicBox occurances = new MagicBox();

        String[] helloWorld = {"h", "e", "l", "l", "o", "w", "o", "r", "l", "d"};

        int char_count = occurences.count(helloWorld, "l");

        System.out.println("#occurrences of l: " + char_count);

      Integer[] myints = {1, 9, 8, 8, 0, 0, 2, 0, 1, 7, 1, 0, 1, 0, 1, 0, 0};

        int int_count = occurences.count(myints, 0);

        System.out.println("#occurrences of zeros: " + int_count);

        //before swap

        System.out.println(helloWorld);

        occurances.swap(helloWorld, 4,5);

        //after swap

        System.out.println(helloWorld);

        //before int swap

        System.out.println(myints);       

        occurances.swap(myints,7,8);

        //after int swap

        System.out.println(myints);

    }

}

Explanation / Answer

CountTest.java

import java.util.Arrays;

public class CountTest {

public static void main(String[] args) {
MagicBox occurences = new MagicBox();
String[] helloWorld = {"h", "e", "l", "l", "o", "w", "o", "r", "l", "d"};
int char_count = occurences.count(helloWorld, "l");
System.out.println("#occurrences of l: " + char_count);

Integer[] myints = {1, 9, 8, 8, 0, 0, 2, 0, 1, 7, 1, 0, 1, 0, 1, 0, 0};
int int_count = occurences.count(myints, 0);
System.out.println("#occurrences of zeros: " + int_count);

//before swap
System.out.println(Arrays.toString(helloWorld));

occurences.swap(helloWorld, 4,5);
//after swap
System.out.println(Arrays.toString(helloWorld));
//before int swap
System.out.println(Arrays.toString(myints));
occurences.swap(myints,7,8);
//after int swap
System.out.println(Arrays.toString(myints));   
}
}

MagicBox.java

public class MagicBox<T> {
   public MagicBox() {
      
   }
   public int count(T t[], T c){
       int count = 0;
       for(int i=0; i<t.length; i++){
           if(t[i] == c){
               count++;
           }
       }
       return count;
   }
   public void swap(T t[], int a, int b){
       T temp = t[a];
       t[a] = t[b];
       t[b] = temp;
      
   }
}

Output:

#occurrences of l: 3
#occurrences of zeros: 7
[h, e, l, l, o, w, o, r, l, d]
[h, e, l, l, w, o, o, r, l, d]
[1, 9, 8, 8, 0, 0, 2, 0, 1, 7, 1, 0, 1, 0, 1, 0, 0]
[1, 9, 8, 8, 0, 0, 2, 1, 0, 7, 1, 0, 1, 0, 1, 0, 0]

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