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public class Main {
public class Introduction {
private final static String name = "Xiang GAO";
private final static String role = "Undergraduate";
private final static String region = "Haidian, Beijing";
private final static String school = "China University of Geoscience, Beijing";
private final static String interest = "Coding, Algorithm, Web";
private final static String mail = "gyshgx868 AT gmail DOT com";

@Override
public String toString() {
return "NickName: " + name + ", "
+ "Role: " + role + ", "
+ "Region: " + region + ", "
+ "School: " + school + ", "
+ "Interest: " + interest + ", "
+ "Mail: " + mail + ".";
}
}

public static void main(String[] args) {
Introduction intro = new Main().new Introduction();
System.out.println(intro);
}
}