这样,把c:\my change to c:\myanimal
remember, the directory name means the package name in some way.
then in c:\, run "javac myanimal/TestDerived.java" and "java myanimal.TestDerived"
remember, the directory name means the package name in some way.
then in c:\, run "javac myanimal/TestDerived.java" and "java myanimal.TestDerived"
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