单选题Given: What is the result?（）A 1B 2C 12D Compilation fails.E No output is produced.F An exception is thrown at runtime.

第1题

String a = null；  a.concat（“abc”）；  a.concat（“def”）；  System.out.println（a）；   What is the result？（）  A、 abcB、 nullC、 abcdefD、 Compilation fails.E、 The code runs with no output.F、 An exception is thrown at runtime.

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第2题

单选题Given: What is the result?（）AcollieBharrierCCompilation fails.Dcollie harrierEAn exception is thrown at runtime.

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第3题

单选题Given： What is the result？（）Ar， t， t，Br， e， o，CCompilation fails.DAn exception is thrown at runtime.

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第4题

单选题Given: What is the result?（）A2B3C12D23E123FCompilation fails.GAn exception is thrown at runtime.

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第5题

单选题Given: What is the output?（）A42B420C462D42042ECompilation fails.FAn exception is thrown at runtime.

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第6题

单选题Given: What is the result?（）ABBB, followed by an Exception.CCompilation fails due to an error on line 9.DCompilation fails due to an error on line 14.EAn Exception is thrown with no other output.

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第7题

单选题String a = null；  a.concat（“abc”）；  a.concat（“def”）；  System.out.println（a）；   What is the result？（）AabcBnullCabcdefDCompilation fails.EThe code runs with no output.FAn exception is thrown at runtime.

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