Java jobs answer, review necessary

Java程序设计基础（第四版）答案\App_4.1\.classpath
..............................\.......\.project
..............................\.......\.settings\org.eclipse.jdt.core.prefs
..............................\.......\bin\App_1.class
..............................\.......\src\App_1.java
..............................\.......0\.classpath
..............................\........\.project
..............................\........\.settings\org.eclipse.jdt.core.prefs
..............................\........\bin\App_10.class
..............................\........\src\App_10.java
..............................\.......1\.classpath
..............................\........\.project
..............................\........\.settings\org.eclipse.jdt.core.prefs
..............................\........\bin\App_11.class
..............................\........\src\App_11.java
..............................\......2\.classpath
..............................\.......\.project
..............................\.......\.settings\org.eclipse.jdt.core.prefs
..............................\.......\bin\App_2.class
..............................\.......\src\App2.java
..............................\......3\.classpath
..............................\.......\.project
..............................\.......\.settings\org.eclipse.jdt.core.prefs
..............................\.......\bin\App3.class
..............................\.......\src\App3.java
..............................\......4\.classpath
..............................\.......\.project
..............................\.......\.settings\org.eclipse.jdt.core.prefs
..............................\.......\bin\App4.class
..............................\.......\src\App4.java
..............................\......5\.classpath
..............................\.......\.project
..............................\.......\.settings\org.eclipse.jdt.core.prefs
..............................\.......\bin\App5.class
..............................\.......\src\App5.java
..............................\......6\.classpath
..............................\.......\.project
..............................\.......\.settings\org.eclipse.jdt.core.prefs
..............................\.......\bin\App_6.class
..............................\.......\src\App_6.java
..............................\......7\.classpath
..............................\.......\.project
..............................\.......\.settings\org.eclipse.jdt.core.prefs
..............................\.......\bin\App_7.class
..............................\.......\src\App_7.java
..............................\......8\.classpath
..............................\.......\.project
..............................\.......\.settings\org.eclipse.jdt.core.prefs
..............................\.......\bin\App_8.class
..............................\.......\src\App_8.java
..............................\......9\.classpath
..............................\.......\.project
..............................\.......\.settings\org.eclipse.jdt.core.prefs
..............................\.......\bin\App_9.class
..............................\.......\src\App_9.java
..............................\....5.1\.classpath
..............................\.......\.project
..............................\.......\.settings\org.eclipse.jdt.core.prefs
..............................\.......\bin\App_5.class
..............................\.......\src\App_5.java
..............................\.......0\.classpath
..............................\........\.project
..............................\........\.settings\org.eclipse.jdt.core.prefs
..............................\........\bin\App_10.class
..............................\........\src\App_10.java
..............................\.......1\.classpath
..............................\........\.project
..............................\........\.settings\org.eclipse.jdt.core.prefs
..............................\........\bin\App_11.class
..............................\........\src\App_11.java
..............................\......2\.classpath
..............................\.......\.project
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