[명품JAVA프로그래밍] 5장 실습문제 4번

import java.util.Scanner;

public abstract class Converter {
	abstract protected double convert(double src);
	abstract protected String getSrcString();
	abstract protected String getDestString();
	protected double ratio;
	
	public void run() {
		Scanner scanner = new Scanner(System.in);
		System.out.println(getSrcString()+"을 "+getDestString()+"로 바꿉니다.");
		System.out.print(getSrcString()+"을 입력하세요>> ");
		double val = scanner.nextDouble();
		double res = convert(val);
		System.out.println("변환 결과: "+res+getDestString()+"입니다");
		scanner.close();
	}
}


public class Km2Mile extends Converter {
	private double ratio;
	public Km2Mile(double ratio) {
		// TODO Auto-generated constructor stub
		this.ratio = ratio;
	}

	@Override
	protected double convert(double src) {
		// TODO Auto-generated method stub
		return src/ratio;
	}

	@Override
	protected String getSrcString() {
		// TODO Auto-generated method stub
		return "Km";
	}

	@Override
	protected String getDestString() {
		// TODO Auto-generated method stub
		return "mile";
	}

	public static void main(String[] args) {
		// TODO Auto-generated method stub
		Km2Mile toMile = new Km2Mile(1.6);
		toMile.run();
	}

}

 

결과

Km을 mile로 바꿉니다.
Km을 입력하세요>> 30
변환 결과: 18.75mile입니다