线程一些常见操作

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休眠

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Thread.sleep(87000000);

优雅又简单的方式(java.util.concurrent.TimeUnit)来了：

TimeUnit.DAYS.sleep(1);
TimeUnit.MINUTES.sleep(10);

或者

TimeUnit.HOURS.sleep(24);
TimeUnit.MINUTES.sleep(10);

另：TimeUnit还提供了丰富的时间转换的功能,以下随意一个枚举值

MINUTES {
 public long toNanos(long d) { return x(d, C4/C0, MAX/(C4/C0)); }
 public long toMicros(long d) { return x(d, C4/C1, MAX/(C4/C1)); }
 public long toMillis(long d) { return x(d, C4/C2, MAX/(C4/C2)); }
 public long toSeconds(long d) { return x(d, C4/C3, MAX/(C4/C3)); }
 public long toMinutes(long d) { return d; }
 public long toHours(long d) { return d/(C5/C4); }
 public long toDays(long d) { return d/(C6/C4); }
 public long convert(long d, TimeUnit u) { return u.toMinutes(d); }
 int excessNanos(long d, long m) { return 0; }
}