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31 lines
625 B
31 lines
625 B
6 years ago
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/*
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* Copyright (c) 2019-present, Facebook, Inc.
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*
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* This source code is licensed under the MIT license found in the
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* LICENSE file in the root directory of this source tree.
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*/
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class AccountImplementation implements Account {
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int mBalance = 0;
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private void addToBalance(int amount) {
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mBalance += amount;
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}
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public synchronized void deposit(int amount) {
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if (amount > 0) {
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addToBalance(amount);
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}
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}
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public synchronized int withdraw(int amount){
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if (amount >= 0 && mBalance - amount >= 0) {
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addToBalance(-amount);
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return mBalance;
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} else {
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return 0;
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}
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}
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}
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