abctract classを使った糸魚川市のプログラムです。
package itoigawa;
import java.util.Scanner;



abstract class ItoigawaCity{
	void ItoigawaCity() {}
}

class ItoigawaRikyu extends ItoigawaCity {
	private String city = "糸魚川市";
	void ItoigawaCity() {
		System.out.println(city);
	}
	void ItoigawaRikyu() {
		String shop_name="糸魚川利休";
		System.out.println(shop_name);
	}
	void SetItoigawa(String s) {
		if (s.equals(city)== true) {
			this.city = s;
		} else {
			this.city = city;
		}

	}
	String GetItoigawa() {
		return this.city;
	}
}

public class Itoigawa2 {
	public static void main(String[] args) {
		ItoigawaRikyu ir = new ItoigawaRikyu();
		Scanner sc = new Scanner(System.in);
		System.out.println("糸魚川利休のある市はどこでしょう？");
		String shop_name2 = sc.nextLine();
		ir.ItoigawaCity();
		ir.ItoigawaRikyu();
		ir.SetItoigawa(shop_name2);
		String ans = ir.GetItoigawa();
		System.out.println(ans);
		sc.close();

	}
}