dave on Nostr: ...
不安全，因为判断singleton2是否为null是在synchronized块之前完成的，所以只有当singleton2为null时，线程才会进入synchronized块，因此只会创建一个实例，从而保证singleton2是线程安全的。
dave /
npub1tsg…htk4
2023-02-08 10:28:34
in reply to nevent1q…98d8
Author Public Key
npub1tsgw6pncspg4d5u778hk63s3pls70evs4czfsmx0fzap9xwt203qtkhtk4Published at
2023-02-08 10:28:34Event JSON
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"content": "不安全，因为判断singleton2是否为null是在synchronized块之前完成的，所以只有当singleton2为null时，线程才会进入synchronized块，因此只会创建一个实例，从而保证singleton2是线程安全的。",
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