Android-based development on the basis of knowledge, as well as a combination of classes and inheritance, polymorphism

class4
......\.classpath
......\.project
......\bin
......\...\Person.class
......\...\class5
......\...\......\Circle.class
......\...\......\Main.class
......\...\......\Rectangle.class
......\...\......\Shape.class
......\...\class5_test
......\...\...........\BMW.class
......\...\...........\Car.class
......\...\...........\CarShop.class
......\...\...........\Main.class
......\...\...........\QQ.class
......\...\lesson3
......\...\.......\Man.class
......\...\.......\Test3.class
......\...\lesson3_test
......\...\............\Student.class
......\...\............\test.class
......\...\lesson4
......\...\.......\Rectangle.class
......\...\lesson4extend
......\...\.............\Rectangle.class
......\...\.............\Square.class
......\...\lesson4test
......\...\...........\Square.class
......\...\test1
......\...\.....\Hand.class
......\...\.....\Leg.class
......\...\.....\Limb.class
......\...\.....\Person.class
......\...\test2
......\...\.....\MyString.class
......\src
......\...\Person.java
......\...\class5
......\...\......\Circle.java
......\...\......\Main.java
......\...\......\Rectangle.java
......\...\......\Shape.java
......\...\class5_test
......\...\...........\BMW.java
......\...\...........\Car.java
......\...\...........\CarShop.java
......\...\...........\Main.java
......\...\...........\QQ.java
......\...\lesson3
......\...\.......\Man.java
......\...\.......\Test3.java
......\...\lesson3_test
......\...\............\Student.java
......\...\............\test.java
......\...\lesson4
......\...\.......\Rectangle.java
......\...\lesson4extend
......\...\.............\Rectangle.java
......\...\.............\Square.java
......\...\lesson4test
......\...\...........\Square.java
......\...\test1
......\...\.....\Hand.java
......\...\.....\Leg.java
......\...\.....\Limb.java
......\...\.....\Person.java
......\...\test2
......\...\.....\MyString.java

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