Java textbook classic case study, we can look one up.

BookExamples
............\ch01
............\....\AppletExample.html
............\....\J_HelloApplet.class
............\....\J_HelloApplet.java
............\....\J_HelloJava.java
............\ch02
............\....\J_Boolean.java
............\....\J_Break.java
............\....\J_CastExample.java
............\....\J_Continue.java
............\....\J_Factorial.java
............\....\J_Identifier.java
............\ch03
............\....\e03_01
............\....\......\J_Circle.class
............\....\......\J_Circle.java
............\....\......\J_MainCircle.class
............\....\......\J_MainCircle.java
............\....\......\MainCircle.html
............\....\......\MainCircle.rar
............\....\......\MANIFEST.MF
............\....\......\my.jar
............\....\e03_02
............\....\......\AppletExample.html
............\....\......\J_Circle.class
............\....\......\J_Shape.class
............\....\......\J_ShapeTest.class
............\....\......\J_ShapeTest.java
............\....\......\J_Square.class
............\....\e03_03
............\....\......\J_Class.java
............\....\......\J_Main.java
............\....\e03_04
............\....\......\J_Example.java
............\....\e03_05
............\....\......\AppletExample.html
............\....\......\J_Circle.class
............\....\......\J_Shape.class
............\....\......\J_ShapeTest.class
............\....\......\J_ShapeTest.java
............\....\......\J_Square.class
............\....\e03_06
............\....\......\J_Test.java
............\....\e03_07
............\....\......\J_Test.java
............\....\e03_08
............\....\......\J_Test.java
............\....\e03_09
............\....\......\J_Test.java
............\....\e03_10
............\....\......\J_Test.java
............\....\J_Extends.java
............\....\J_Fibonacci.java
............\....\J_Finalize.java
............\....\J_Overload.java
............\ch04
............\....\e04_01
............\....\......\J_Exception.java
............\....\e04_02
............\....\......\J_Exception.java
............\....\e04_03
............\....\......\J_Exception.java
............\....\e04_04
............\....\......\J_Exception.java
............\....\J_Capacity.java
............\....\J_Grid15.java
............\....\J_Intern.java
............\ch05
............\....\data.dat
............\....\e05_01
............\....\......\J_Echo.java
............\....\e05_02
............\....\......\J_Echo.java
............\....\e05_03
............\....\......\J_Example.java
............\....\......\test.txt
............\....\e05_04
............\....\......\J_Echo.java
............\....\......\J_Example.java
............\....\......\test.txt
............\....\e05_05
............\....\......\J_Example.java
............\....\e05_06
............\....\......\J_Example.java
............\....\e05_07
............\....\......\J_Example.java
............\....\e05_08
............\....\......\J_Echo.java
............\....\......\J_Example.java
............\....\......\test.txt
............\....\e05_09
............\....\......\J_DataInputStream.java
............\....\......\J_Example.java
............\....\......\out.txt
............\....\e05_10
............\....\......\J_Example.java
............\....\e05_11
............\....\......\J_Example.java
............\....\e05_12

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