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单选题
A class design requires that a member variable cannot be accessible directly outside the class. Which modifier should be used to obtain the access control？（）
A
public
B
no modifier
C
protected
D
private
参考答案
参考解析
解析：
这个在前面也有叙述，java有四种访问类型，分别为：public,protected,default,private，其中public变量可以被所有的外部类访问，而pretected的可以被同一个包及该类的子类访问，default即没有任何修饰符的变量可以被同一个包中的类访问，而private变量只能在被该类内部被访问。题目中的外部类应该理解为除该类自身的所有其它类，因此只有使用private可以达到要求
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