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类Account中方法声明正确的是哪一项?()
- A、class Account{ deposit(); }
- B、class Account{ void deposit(); }
- C、class Account{ void deposit{} }
- D、class Account{ void deposit(){} }
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单选题类Account中方法声明正确的是哪一项?()A
class Account{ deposit(); }B
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class Account{ void deposit{} }D
class Account{ void deposit(){} }
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单选题class Account { private int balance; public void setBalance(int b) { balance = b; } public int getBalance() { return balance; } public void clearBalance() { balance = 0; } } 哪一个改变可以使 Account 类线程安全?()A
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在第3行加 synchronized 修饰符。C
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