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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