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在第2行加 synchronized 修饰符。B在第3行加 synchronized 修饰符。C在第3行、第4行和第6行加 synchronized 修饰符。D在第4行、第6行和第8行加 synchronized 修饰符。
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
在第2行加 synchronized 修饰符。
B
在第3行加 synchronized 修饰符。
C
在第3行、第4行和第6行加 synchronized 修饰符。
D
在第4行、第6行和第8行加 synchronized 修饰符。
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