Need to turn char into lower case and replace it in Java

So I need to make a basic cash register that accepts 5 items in an array with a price on them. Nevertheless, some items will have HST(tax) included with them. To know which items have tax and which don't. The user will press h or H before or after entering the dollar amount. I have got most of the program working, but I cannot get my code to recognize the upper case H to put the tax in it.
Here is my code, Thx in advance for any information:

// Import scanner class
import java.util.Scanner;
// Create class and method
class Main {
public static void main(String[] args) {
// Create scanner object and set scanner variables
Scanner inp = new Scanner(System.in);
System.out.println("Press any key to start");
String key = inp.nextLine();
System.out.println("\nEnter the amount of each item");
System.out.println("Upto 5 inputs are allowed!\n");
// Initialize counter and index variables to use it in the while loop
int counter = 0;
int index = 0;
// Create a double array variable, and set the limit to 5
double[] numbers = new double[5];
// Create a boolean variable to use it in the while loop
boolean go = true;
while(go) {           
String value = inp.nextLine();      
value.toLowerCase();
// Set the index value to "h" or "H"
int indexOfh = value.indexOf('h');
boolean containsh = indexOfh == 0 || indexOfh == (value.length()-1);
if(containsh){ //Validate h at beginning or end
numbers[index] = Double.parseDouble(value.replace("h", ""));
index++;
System.out.println("HST will be taken account for this value");
}
counter++;
if (counter == 5){
go = false;
}
}
System.out.println("HST Values:");
for(int i=0; i< numbers.length; i++) {
System.out.println(numbers[i]);
}
}
}

I would remove indexOfh entirely: you can OR a bunch of statements together. This is safe because >= is evaluated before ||.

// Set the index value to "h" or "H"
boolean containsh = value.indexOf('h') >= 0
|| value.indexOf('H') >= 0;

Also, you can make your requirement a little tighter by using startsWith and endsWith to ignore an 'H' or 'h' in the middle.

// Set the index value to "h" or "H"
boolean containsh = value.startsWith("h")
|| value.startsWith("H") || value.endsWith("h")
|| value.endsWith("H");

Additionally, you have a resource leak because you never close your Scanner: you can use try-with-resources to have Java manage this for you. That, along with a few other simplifications, yields a new version like this.

// Import scanner class
import java.util.Scanner;
// Create class and method
public class so64283526 {
public static void main(String[] args) {
// Create scanner object and set scanner variables
try (Scanner inp = new Scanner(System.in)) {
System.out.println("Press any key to start");
System.out.println("\nEnter the amount of each item");
System.out.println("Upto 5 inputs are allowed!\n");
// Initialize counter and index variables to use it in the while
// loop
int counter = 0;
int index = 0;
// Create a double array variable, and set the limit to 5
double[] numbers = new double[5];
while (counter++ < 5) {
String value = inp.nextLine();
value.toLowerCase();
// Set the index value to "h" or "H"
boolean containsh = value.startsWith("h")
|| value.startsWith("H") || value.endsWith("h")
|| value.endsWith("H");
if (containsh) { // Validate h at beginning or end
numbers[index] = Double
.parseDouble(value.toLowerCase().replace("h", ""));
index++;
System.out.println(
"HST will be taken account for this value");
}
}
System.out.println("HST Values:");
for (int i = 0; i < numbers.length; i++) {
System.out.println(numbers[i]);
}
}
}
}

Results:

Press any key to start
Enter the amount of each item
Upto 5 inputs are allowed!
1
2H
HST will be taken account for this value
H3
HST will be taken account for this value
h4.7
HST will be taken account for this value
5.h6
HST Values:
2.0
3.0
4.7
0.0
0.0