src/main/java/com/bytelegend/Cat.java
src/main/java/com/bytelegend/Dog.java
src/main/java/com/bytelegend/Boy.java
src/main/java/com/bytelegend/Girl.java
src/main/java/com/bytelegend/Animal.java
src/main/java/com/bytelegend/Person.java
src/main/java/com/bytelegend/Life.java
