/* package whatever; // don't place package name! */
 
import java.util.*;
import java.lang.*;
import java.io.*;
 
// クラスの定義（Main.javaにまとめるため、publicを外しています）
class Train {
    public int speed;
 
    public void run() {
        speed = 100;
    }
 
    public void stop() {
        speed = 0;
    }
}
 
// 実行用のMainクラス
public class Main {
    public static void main(String[] args) {
        // Trainクラスが正しく動くか確認するテストコード
        Train myTrain = new Train();
 
        System.out.println("初期状態のspeed: " + myTrain.speed); // 0
 
        myTrain.run();
        System.out.println("run実行後のspeed: " + myTrain.speed); // 100
 
        myTrain.stop();
        System.out.println("stop実行後のspeed: " + myTrain.speed); // 0
    }
}

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