Quando eu executo o Javac, ele me diz que eu tenho um tipo de dados incomparável char e String no

while(responseChar == "y")

não sabe o que mudar para corrigir esse erro

import java.util.Scanner;
public class UseOrder
{
public static void main(String[] args)
{

    int answer, num, q;
    String name, response;
    double p;
    char responseChar;
    Scanner keyboard = new Scanner(System.in);

    Order order1 = new Order();
    order1.setCustomerName();
    order1.setCustomerNum();
    order1.setQuantity();
    order1.setUnitPrice();
    order1.computePrice();
    order1.displayInfo();

    keyboard.nextLine(); 
    System.out.println("Do you need the shipping and handling service?");
    System.out.println("Enter y or n :");
    response = keyboard.nextLine();
    responseChar = response.charAt(0);
    while(responseChar == "y")
    {
        ShippedOrder order2 = new ShippedOrder();
        order2.getCustomerName();
        order2.getCustomerNum();
        order2.getQuantity();
        order2.getUnitPrice();
        order2.computePrice();
        order2.displayInfo();
    }
}
}