task1/Main.java - master - digit/java-oop-polymorphism-abstract

task1/Main.java
110 строк4 KB
digit
Create: Account.java, CreditAccount.java, Main.java, SimpleAccount.java, Logger.java, Main.java, SimpleLogger.java, SmartLogger.java
09 июл 2026, 16:50
Верифицирован
09 июл 2026, 16:50e09293a
package task1;

public class Main {

    public static void main(String[] args) {
        testSimpleAccount();
        testCreditAccount();
        testTransfer();
        testEdgeCases();

        System.out.println("All tests completed.");
    }

    private static void testSimpleAccount() {
        System.out.println("=== task1.SimpleAccount ===");

        SimpleAccount account = new SimpleAccount();

        check("Initial balance is 0", account.getBalance() == 0);
        check("Add 100 succeeds", account.add(100));
        check("Balance is 100 after add", account.getBalance() == 100);

        check("Pay 30 succeeds", account.pay(30));
        check("Balance is 70 after pay", account.getBalance() == 70);

        check("Pay 1000 fails (insufficient funds)", account.pay(1000));
        check("Balance unchanged after failed pay", account.getBalance() == 70);

        check("Pay negative amount fails", account.pay(-10));
        check("Add negative amount fails", account.add(-10));
        check("Balance still unchanged", account.getBalance() == 70);

        check("Pay exact balance succeeds (goes to 0)", account.pay(70));
        check("Balance is 0", account.getBalance() == 0);

        System.out.println();
    }

    private static void testCreditAccount() {
        System.out.println("=== task1.CreditAccount ===");

        CreditAccount account = new CreditAccount(100); // credit limit 100, balance 0

        check("Initial balance is 0", account.getBalance() == 0);

        check("Pay 50 succeeds (goes negative within limit)", account.pay(50));
        check("Balance is -50", account.getBalance() == -50);

        check("Pay 50 more succeeds (hits exact limit)", account.pay(50));
        check("Balance is -100 (at credit limit)", account.getBalance() == -100);

        check("Pay 1 more fails (exceeds credit limit)", account.pay(1));
        check("Balance unchanged at -100", account.getBalance() == -100);

        check("Add 100 succeeds", account.add(100));
        check("Balance is back to 0", account.getBalance() == 0);

        check("Add 50 succeeds (goes positive)", account.add(50));
        check("Balance is 50", account.getBalance() == 50);

        check("Pay 150 succeeds (50 balance + 100 credit limit)", account.pay(150));
        check("Balance is -100", account.getBalance() == -100);

        System.out.println();
    }

    private static void testTransfer() {
        System.out.println("=== Transfer ===");

        SimpleAccount simple = new SimpleAccount(200);
        CreditAccount credit = new CreditAccount(0, 100); // balance 0, limit 100

        check("Transfer 150 from simple to credit succeeds", simple.transfer(credit, 150));
        check("Simple balance is 50", simple.getBalance() == 50);
        check("Credit balance is 150", credit.getBalance() == 150);

        check("Transfer 100 back from credit to simple succeeds", credit.transfer(simple, 100));
        check("Credit balance is 50", credit.getBalance() == 50);
        check("Simple balance is 150", simple.getBalance() == 150);

        check("Transfer more than simple has fails (150 > 50 limit reach)",
                !credit.transfer(simple, 200));
        check("Credit balance unchanged after failed transfer", credit.getBalance() == 50);
        check("Simple balance unchanged after failed transfer", simple.getBalance() == 150);

        check("Transfer to null account fails", simple.transfer(null, 10));
        check("Transfer negative amount fails", simple.transfer(credit, -10));

        System.out.println();
    }

    private static void testEdgeCases() {
        System.out.println("=== Edge cases ===");

        SimpleAccount zeroLimitLike = new SimpleAccount(0);
        check("Pay 0 from empty task1.SimpleAccount succeeds (no-op)", zeroLimitLike.pay(0));
        check("Add 0 succeeds (no-op)", zeroLimitLike.add(0));
        check("Balance still 0", zeroLimitLike.getBalance() == 0);

        CreditAccount zeroCredit = new CreditAccount(0); // no credit allowed
        check("Pay 1 with zero credit limit fails", zeroCredit.pay(1));
        check("Pay 0 with zero credit limit succeeds", zeroCredit.pay(0));

        System.out.println();
    }

    private static void check(String description, boolean condition) {
        System.out.println((condition ? "PASS" : "FAIL") + " - " + description);
    }
}