Using JAVA to write animal classes and zoo classes, you can use arrays to dynamically build different animals and randomly emit different sounds

动物园
动物园\.classpath
动物园\.project
动物园\.settings
动物园\.settings\org.eclipse.jdt.core.prefs
动物园\bin
动物园\bin\com
动物园\bin\com\momo
动物园\bin\com\momo\biz
动物园\bin\com\momo\biz\AnimalMgr.class
动物园\bin\com\momo\dao
动物园\bin\com\momo\dao\Animal.class
动物园\bin\com\momo\dao\Cat.class
动物园\bin\com\momo\dao\Dolphin.class
动物园\bin\com\momo\dao\Duck.class
动物园\bin\com\momo\dao\Terrestrial.class
动物园\src
动物园\src\com
动物园\src\com\momo
动物园\src\com\momo\biz
动物园\src\com\momo\biz\AnimalMgr.java
动物园\src\com\momo\dao
动物园\src\com\momo\dao\Animal.java
动物园\src\com\momo\dao\Cat.java
动物园\src\com\momo\dao\Dolphin.java
动物园\src\com\momo\dao\Duck.java
动物园\src\com\momo\dao\Terrestrial.java

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