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  1.  
  2.  
  3. import java.util.Timer;
  4. import java.util.TimerTask;
  5. import java.util.function.IntConsumer;
  6.  
  7.  
  8. public class Main {
  9.  
  10.  
  11. 	private static class CountDownTimer extends Timer {
  12.  
  13. 		private IntConsumer onCountDown;
  14. 		private Runnable onCountZero;
  15.  
  16. 		public CountDownTimer(IntConsumer onCountDown, Runnable onCountZero) {
  17.  
  18. 			this.onCountDown = onCountDown;
  19. 			this.onCountZero = onCountZero;
  20. 		}
  21.  
  22. 		public TimerTask countDown(int count, long period) {
  23.  
  24. 			Task task = new Task(count);
  25. 			scheduleAtFixedRate(task, 0L, period);
  26.  
  27. 			return task;
  28. 		}
  29.  
  30. 		private class Task extends TimerTask {
  31.  
  32. 			private int count;
  33.  
  34. 			public Task(int count) {
  35. 				this.count = count;
  36. 			}
  37.  
  38. 			@Override
  39. 			public void run() {
  40.  
  41. 				onCountDown.accept(count);
  42.  
  43. 				if (--count < 0) {
  44. 					Task.this.cancel();
  45. 					onCountZero.run();
  46. 				}
  47. 			}
  48. 		}
  49. 	}
  50.  
  51.  
  52. 	public static void main(String[] args) throws Exception {
  53.  
  54. 		// カウントダウン時の処理 (count: int)
  55. 		IntConsumer onCountDown = count -> {
  56. 			System.out.println(count);
  57. 		};
  58.  
  59. 		// カウントゼロ時の処理
  60. 		Runnable onCountZero = () -> {
  61. 			System.out.println("Game Over");
  62. 		};
  63.  
  64. 		// Timer を開始する
  65. 		CountDownTimer timer = new CountDownTimer(onCountDown, onCountZero);
  66.  
  67. 		// カウントの初期値とカウントダウン間隔 (ミリ秒)
  68. 		int  count  = 10;
  69. 		long period = 1000L;
  70.  
  71. 		// カウントダウン開始 (所要時間 10 秒)
  72. 		TimerTask task = timer.countDown(count, period);
  73.  
  74. 		// 開始後 5 秒間待機
  75. 		Thread.sleep(5000L);
  76.  
  77. 		// カウントダウンを途中で止めてみる
  78. 		task.cancel();
  79.  
  80. 		// その後 5 秒間待機
  81. 		Thread.sleep(5000L);
  82.  
  83. 		// カウントダウン開始 (所要時間 10 秒)
  84. 		timer.countDown(count, period);
  85.  
  86. 		// 開始後 12 秒間待機
  87. 		Thread.sleep(12000L);
  88.  
  89. 		// プログラム終了時に必要な処理
  90. 		timer.cancel();
  91. 	}
  92. }
  93.  
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https://ideone.com/gyVkVT
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Text (text 6.10)
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2 years ago
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