多項選擇題

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；}

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單項選擇題

What is the result？（）

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

單項選擇題

What is the result？（）

A.Hello
B.Hello World
C.Compilation fails.
D.Hello World 5
E.The code runs with no output.
F.An exception is thrown at runtime.

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

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What is the result？（）

What is the result？（）

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

What is the result？（）

What is the result？（）