Question

Please use java code.

Implement a test class named BatArray1Test that tests all the functionality of the following given 3 methods, including the invalid arguments:

1) commonEnd

Given two arrays of ints, a and b, return true if they have the same first element or they have the same last element. This method should return false if either array is empty or null.

2) midThree

Given an array of integers, return a new array of length 3 containing the elements from the middle of the array. This method should return null if the array length is even or less than 3.

3) maxTriple

Given an array of integers, look at the first, last, and middle values in the array, and return the largest value. This method should return 0 if the length of the array is even.

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Answer 1

Note: Could you plz go through this code and let me know if u need any changes in this.Thank You
_________________

// BatArray1Test.java

public class BatArray1Test {

   public static void main(String[] args) {
       int array1[]={4,6,7,8,9,10,21};
       int array2[]={4,7,8,9,2,10,21};
       if(commonEnd(array1,array2))
       {
           System.out.println("Both arrays having command End");
       }
       else
       {
           System.out.println("Both arrays not having command End");
       }
      
       int midArray[]=midThree(array1);
       if(midArray!=null)
       {
           for(int i=0;i<midArray.length;i++)
           {
               System.out.println(midArray[i]+" ");
           }          
       }

       int largest=maxTriple(array1);
       if(largest!=0)
       System.out.println("Largest Value :"+largest);

   }

   private static int maxTriple(int[] array1) {
       int max=0;
       if(array1.length%2==0)
       {
           return 0;
       }
       else
       {
           max=array1[0];
           if(max<array1[(array1.length/2)+1])
           {
               max=array1[(array1.length/2)+1];
           }
           if(max<array1[array1.length-1])
           {
               max=array1[array1.length-1];
           }
       }
       return max;
   }

   private static int[] midThree(int[] array1) {
       int arr[]=null;
       if(array1.length%2==0 || array1.length<3)
       {
           return arr;
       }
       else
       {
           arr=new int[3];
           arr[0]=array1[0];
           arr[1]=array1[(array1.length/2)+1];
           arr[2]=array1[array1.length-1];
       }
       return arr;
   }

   public static boolean commonEnd(int arr1[],int arr2[])
   {
       boolean b=false;
       if(arr1==null || arr2==null)
           b=false;
       else if(arr1.length==0 || arr2.length==0)
           b=false;
       if(arr1[0]==arr2[0] && arr1[arr1.length-1]==arr2[arr2.length-1])
           b=true;
      
       return b;
   }
}
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Output:

Both arrays having command End
4
9
21
Largest Value :21

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