Which three statements are true?（）

多项选择题Which three statements are true?（）

A.A final method in class X can be abstract if and only if X is abstract.
B.A protected method in class X can be overridden by any subclass of X.
C.A private static method can be called only within other static methods in class X.
D.A non-static public final method in class X can be overridden in any subclass of X.
E.A public static method in class X can be called by a subclass of X without explicitly referencing the class X.
F. A method with the same signature as a private final method in class X can be implemented in a subclass of X.
G. A protected method in class X can be overridden by a subclass of X only if the subclass is in the same package as X.

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1.多项选择题 Given:

Which three are valid?（）

A.p0 = p1;
B.p1 = p2;
C.p2 = p4;
D.p2 = (ClassC)p1;
E.p1 = (ClassB)p3;
F.p2 = (ClassC)p4;

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2.单项选择题 Given:

What is the result?（）

A.Canada
B.null Canada
C.Canada null
D.Canada Canada
E.Compilation fails due to an error on line 26.
F.Compilation fails due to an error on line 29.

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3.单项选择题 Given:

What is the result? （）

A.three
B.other
C.An exception is thrown at runtime.
D.Compilation fails because of an error on line 12.
E.Compilation fails because of an error on line 13.
F.Compilation fails because of an error on line 15.

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4.单项选择题 Given:

What is the result?（）

A.test end
B.Compilation fails.
C.test runtime end
D.test exception end
E.Throwable is thrown by main at runtime.

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5.多项选择题Which two code fragments are most likely to cause a StackOverflowError?（）

A.
B.
C.
D.
E.
F.

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6.单项选择题 Given:

What is the result?（）

A.The value "4" is printed at the command line.
B.Compilation fails because of an error in line 5.
C.Compilation fails because of an error in line 9.
D.A NullPointerException occurs at runtime.
E.A NumberFormatException occurs at runtime.
F.An IllegalStateException occurs at runtime.

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7.单项选择题 Given:

What is the result?（）

A.null
B.finally
C.null finally
D.Compilation fails.
E.finally exception

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8.单项选择题 Given:

Which command-line invocations will compile?（）

A.javac Mule.java
B.javac -source 1.3 Mule.java
C.javac -source 1.4 Mule.java
D.javac -source 1.5 Mule.java

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9.单项选择题 Given:

What is the result?（）

A.null
B.zero
C.some
D.Compilation fails.
E.An exception is thrown at runtime.

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10.单项选择题 Given:

What is the result?（）

A.B
B.B, followed by an Exception.
C.Compilation fails due to an error on line 9.
D.Compilation fails due to an error on line 14.
E.An Exception is thrown with no other output.

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