Write a Java program, a simulation including teacher preparation, school students, classroom assignments and homework in the teaching process. Job to determine whether the string is 2-duplicate strings string manipulation and other content.

JavaTeaching2012
................\.classpath
................\.project
................\.settings
................\.........\org.eclipse.jdt.core.prefs
................\bin
................\...\cn
................\...\..\qtech
................\...\..\.....\teaching
................\...\..\.....\........\Student.class
................\...\..\.....\........\Teacher.class
................\...\..\.....\........\Teaching.class
................\...\..\.....\........\TeachingMessage.class
................\...\..\.....\........\TeachingState.class
................\...\..\.....\........\UniversityPeople.class
................\...\..\.....\util
................\...\..\.....\....\RepeatedStringEstimator.class
................\src
................\...\cn
................\...\..\qtech
................\...\..\.....\teaching
................\...\..\.....\........\Student.java
................\...\..\.....\........\Teacher.java
................\...\..\.....\........\Teaching.java
................\...\..\.....\........\TeachingMessage.java
................\...\..\.....\........\TeachingState.java
................\...\..\.....\........\UniversityPeople.java
................\...\..\.....\util
................\...\..\.....\....\RepeatedStringEstimator.java

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