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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？（） 

单选题
2022-04-20 05:32
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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正确答案
D
试题解析
标签： CMS专题 Java认证考试 Java认证考试综合练习
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class java { 
public static void main（String [] java） {  
for （int Java = 1； Java 〈 java.length； Java++）  
System.out.print（"java "）；  
}  
}  
和命令行： 
java java java java java  
结果为：（）  
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