單項(xiàng)選擇題

Which one statements is true？（）

A.Compilation fails.
B.An exception is thrown at runtime.
C.The attribute id in the ItemTest object remains unchanged.
D.The attribute id in the ItemTest object is modified to the new value.
E.A new ItemTest object is created with the preferred value in the id attribute.

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多項(xiàng)選擇題

Which two methods， inserted individually， correctly complete the Three class？（）

A.public void foo（）{ }
B.public int foo（）{return 3；}
C.public Two foo（）{return this；}
D.public One foo（）{return this；}
E.public Object foo（）{return this；}

單項(xiàng)選擇題

What is the result？（）

A.3
B.23
C.32
D.123
E.321
F.Compilation fails.
G.An exception is thrown at runtime.

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Which one statements is true？（）

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Which two methods， inserted individually， correctly complete the Three class？（）

What is the result？（）

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Which two methods， inserted individually， correctly complete the Three class？（）