Question

Exercise 2: Write array methods that carry out the following tasks for an array of integers by creating and completing the “ArrayMethods” class below. Add documentation comments for each method. Provide a test program called 'Lab5_yourID.java” that test methods of ArrayMethods class. In your test program, use random class to generate array values. public class ArrayMethods { private int[ ] values; //declare instant variables public ArrayMethods (int[] initialValues) {values = initialValues;} //constructor public void shiftRight() { } public Boolean adjacentDuplicate() {...} ... } . Method shiftRight: that shifts all elements by one to the right and move the last element into the first position. For example, 1 4 9 16 25 would be transformed into 25 1 4 19 16. Method adjacentDuplicate: returns true if the array has two adjacent duplicate elements.

Answer 1

public class ArrayMethods {
private int[] values;
  
public ArrayMethods(int[] initialValues)
{
values = initialValues;
}
  
public void shiftRight()
{
// first we need to store the last element of the array so that we can place it at 1st index of the array, later on
int lastElement = values[values.length - 1];
// and we are setting -1 to the last element of the array
values[values.length - 1] = -1;
// loop counter variable
int i;
// we will be running a for-loop over the array, from last to second element
for(i = values.length - 1; i > 0; i--)
{
// and we are replacing the current element with the previous element
values[i] = values[i - 1];
}
// lastly, we are placing the last element (previously stored) at index 0 of the array
values[0] = lastElement;
}
  
public Boolean adjacentDuplicate()
{
// a Boolean variable for the result
Boolean found = false;
// we are running a for-loop over the array from first to the second-last element
for(int i = 0; i < values.length - 1; i++)
{
// now, we are checking whether the current element and the element just after it are same or not
// if they are same, we are storing a true in the found variable and breaking out from the loop
if(values[i] == values[i + 1])
{
found = true;
break;
}
}
// lastly, we are returning the Boolean result
return found;
}
  
// (Optional): This method displays the contents of the array
public void display()
{
for(int i = 0; i < values.length; i++)
System.out.print(values[i] + " ");
System.out.println();
}
}

********************************************************* SCREENSHOT *******************************************************

run: D Displaying the initial contents of the array "values".. 33 56 40 95 32 32 69 59 39 87 87 Displaying the initial contents of the array "valuesAnother".. 48 56 92 33 11 63 Shifting the elements of the array "values" by 1 to the right.. 87 33 56 40 95 32 32 69 59 39 87 Verifying whether an array has adjacent duplicate elements or not.. Array "values" has adjacent duplicates? true Array "valuesAnother" has adjacent duplicates? false BUILD SUCCESSFUL (total time: 0 seconds)