10. 设有下面的两个类定义:class A{void show(){System.out.print("AA");}} class B extends A{void show(){System.out.print("BB");}} 则顺序执行如下语句后输出的结果为 。A a=new A();B b=new B(); a.show();b.show();
A. AAAA
B. AABB
C. BBBB
D. BBAA
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