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1£©Java Language Specification, Third Edition (by James Gosling)
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2£© Effective Java , Second Edition (by Joshua Bloch)
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3) Java Concurrency in Practice (by Brian Goetz)
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import java.io.File;
import java.util.HashMap;
import java.util.List;
import java.util.Map;
import java.util.Set;
import java.util.Iterator;
import org.dom4j.Document;
import org.dom4j.DocumentException;
import org.dom4j.Element;
import org.dom4j.io.SAXReader;
public class ReadSetting {
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