Crédito

package ShoppingApplication.methods;

public class Credit {
    public double limit;

    public Credit(double limit) {
        this.limit = limit;
    }

    public double getLimit() {
        return limit;
    }

    public void setLimit(double limit) {
        this.limit = limit;
    }
}

Compras

package ShoppingApplication.methods;

public class Purchases implements Comparable <Purchases> {
    private String product;
    private double price;

    public Purchases(String product, double price) {
        this.product = product;
        this.price = price;
    }

    public String getProduct() {
        return product;
    }

    public void setProduct(String product) {
        this.product = product;
    }

    public double getPrice() {
        return price;
    }

    public void setPrice(double price) {
        this.price = price;
    }

    public int compareTo(Purchases other){
        return Double.compare(this.price, other.price);
    }

   @Override
    public String toString() {
        return "Produto:" + this.getProduct() + "\nPreço:" + this.getPrice();
    }
}

Main

import ShoppingApplication.methods.Credit;
import ShoppingApplication.methods.Purchases;
import java.util.ArrayList;
import java.util.Collections;
import java.util.List;
import java.util.Scanner;

public class Main {
    public static void main(String[] args) {

        Scanner scanner = getScanner();
        double totalSpent = 0;

        List <Purchases> shoppingList = new ArrayList<>();

        System.out.println("Digite o limite do cartão:");
        var cardLimit = new Credit(scanner.nextDouble());
        scanner.nextLine();

        while (true){
            System.out.println("Digite o produto da compra:");
            String product = scanner.nextLine();
            System.out.println(product);

            System.out.println("Qual o valor do produto?");
            double price = scanner.nextDouble();
            if (price > cardLimit.getLimit()){
                System.out.println("O valor da compra ultrapassa o limite do cartão");
                break;
            }else {
                double newLimit = cardLimit.getLimit() - price;
                cardLimit.setLimit(newLimit);
                totalSpent += price;
                System.out.println("Compra realizada! Limite restante: R$" + cardLimit.getLimit());
            }

            var shopping = new Purchases(product, price);
            shoppingList.add(shopping);

            System.out.println("Digite 1 para continuar e 0 para encerrar.");
            int purchase = scanner.nextInt();
            scanner.nextLine();
            System.out.println(purchase);
            if (purchase == 0){
                System.out.println("Compra encerrada");
                break;
            } else if (purchase == 1) {
                System.out.println("Continuar compras");

            } else {
                System.out.println("Informação digitada inválida!");
            }
        }

        Collections.sort(shoppingList);

        System.out.println("\n===== RESUMO DAS COMPRAS =====");
        for (Purchases item: shoppingList){
            System.out.println(item);
        }
        System.out.println("\n======================");

        System.out.println("\nTotal gasto: R$" + totalSpent);
        System.out.println("Limite restante: R$" + cardLimit.getLimit());
    }
    private static Scanner getScanner() {
        return new Scanner(System.in);
    }
}