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  1. /* package whatever; // don't place package name! */
  2.  
  3. import java.util.*;
  4. import java.lang.*;
  5. import java.io.*;
  6.  
  7. class Train {
  8.     public int speed;
  9.  
  10.     public void run() {
  11.         speed = 100;
  12.     }
  13.  
  14.     public void stop() {
  15.         speed = 0;
  16.     }
  17. }
  18.  
  19. public class Main {
  20.     public static void main(String[] args) {
  21.         Train myTrain = new Train();
  22.  
  23.         System.out.println("初期状態のspeed: " + myTrain.speed); // 0
  24.  
  25.         myTrain.run();
  26.         System.out.println("run実行後のspeed: " + myTrain.speed); // 100
  27.  
  28.         myTrain.stop();
  29.         System.out.println("stop実行後のspeed: " + myTrain.speed); // 0
  30.     }
  31. }
Success #stdin #stdout 0.11s 55632KB
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stdin
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Standard input is empty
stdout
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初期状態のspeed: 0
run実行後のspeed: 100
stop実行後のspeed: 0
https://ideone.com/WqQN9b
language:
Java (12.0.1)
created:
6 days ago
visibility:
public

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