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单项选择题

Given:

Which code fragment, inserted at line 24, outputs "123abc 123abc"?（）

A.sb1.append("abc"); s1.append("abc");
B.sb1.append("abc"); s1.concat("abc");
C.sb1.concat("abc"); s1.append("abc");
D.sb1.concat("abc"); s1.concat("abc");
E.sb1.append("abc"); s1 = s1.concat("abc");
F.sb1.concat("abc"); s1 = s1.concat("abc");
G.sb1.append("abc"); s1 = s1 + s1.concat("abc");
H.sb1.concat("abc"); s1 = s1 + s1.concat("abc");

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单项选择题Given: What is the result?（）

A.2
B.3
C.4
D.6
E.7
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单项选择题Given: Which code, inserted at line 15, allows the class Sprite to compile?（）

A.Foo { public int bar() { return 1; }
B.new Foo { public int bar() { return 1; }
C.new Foo() { public int bar() { return 1; }
D.new class Foo { public int bar() { return 1; }

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A.
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C.
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单项选择题Click the Exhibit button. Which statement is true about the classes and interfaces in the exhibit?（）

A.Compilation will succeed for all classes and interfaces.
B.Compilation of class C will fail because of an error in line 2.
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D.Compilation of class AImpl will fail because of an error in line 2.

单项选择题Given： What is the result?（）

A.Afoo Afoo
B.Afoo Bfoo
C.Bfoo Afoo
D.Bfoo Bfoo
E.Compilation fails.
F.An exception is thrown at runtime.