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多項(xiàng)選擇題

A JavaBeans component has the following field：
11. private boolean enabled；
Which two pairs of method declarations follow the JavaBeans standard for accessing this field？（）

A.A
B.B
C.C
D.D

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單項(xiàng)選擇題

Given：

What is the result？（）

A. An exception is thrown at runtime.
B. r， e， o，
C. Compilation fails.
D. r， t， t，

單項(xiàng)選擇題

Click the Exhibit button.
Given： ClassA a = new ClassA（）；
a.methodA（）；
What is the result？（）

A. The code runs with no output.
B. Compilation fails.
C. An exception is thrown at runtime.
D. ClassC is displayed.