「同步」是什麼意思？ - What does 'synchronized' mean?

問題：

I have some questions regarding the usage and significance of the synchronized keyword. 我對synchronized關鍵字的用法和重要性有一些疑問。

• What is the significance of the synchronized keyword? synchronized關鍵字的意義是什麼？
• When should methods be synchronized ? 方法應什麼時候synchronized ？
• What does it mean programmatically and logically? 從程序上和邏輯上是什麼意思？

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解決方案：

參考一： https://stackoom.com/question/4YRR/同步-是什麼意思
參考二： https://oldbug.net/q/4YRR/What-does-synchronized-mean