单项选择题
Given two files， GrizzlyBear.java and Salmon.java：
If both classes are in the correct directories for their packages，and the Mammal class correctly defines thefindSalmon（） method， which change allows this code to compile？（）
A.add import animals.mammals.*； at line 2 in Salmon.java
B.add import animals.fish.*； at line 2 in GrizzlyBear.java
C.add import animals.fish.Salmon.*； at line 2 in GrizzlyBear.java
D.add import animals.mammals.GrizzlyBear.*； at line 2 in Salmon.java B
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单项选择题
Given： When line 14 is reached， how many objects are eligible for the garbage collector？（）
A.0
B.1
C.2
D.3
E.4 -
单项选择题
Given： What is the result？（）
A.Compilation fails.
B.An exception is thrown at runtime.
C.doStuff x = 6 main x = 6
D.doStuff x = 5 main x = 5
E.doStuff x = 5 main x = 6 -
单项选择题
Given： and two separate command line invocations： java Yippee java Yippee 1 2 3 4 What is the result？（）
A.No output is produced.1 2 3
B.No output is produced.2 3 4
C.No output is produced.1 2 3 4
D.An exception is thrown at runtime.1 2 3
