Java 比较字符串实例详解

System.out.println("当前时间为："+getTimeByHour());
  System.out.println(getTimeByHour());
  System.out.println("下一小时为："+getTimeByHour(1));
  System.out.println("对比结果为："+getTimeByHour().compareTo(getTimeByHour(1)));
  System.out.println("对比结果为："+getTimeByHour(1).compareTo(getTimeByHour(0)));
  System.out.println("对比结果为："+getTimeByHour(1).compareTo(getTimeByHour(1)));

/**
  * 获取当前时间
  * @return
  */
 public static String getTimeByHour() {
  Calendar calendar = Calendar.getInstance();
  calendar.set(Calendar.HOUR_OF_DAY, calendar.get(Calendar.HOUR_OF_DAY) + 0);
  return new SimpleDateFormat("yyyy-MM-dd HH:mm:ss").format(calendar.getTime());
 }

 /**
  * 获取当前时间后一小时
  * @param hour
  * @return
  */
 public static String getTimeByHour(int hour) {
  Calendar calendar = Calendar.getInstance();
  calendar.set(Calendar.HOUR_OF_DAY, calendar.get(Calendar.HOUR_OF_DAY) + hour);
  return new SimpleDateFormat("yyyy-MM-dd HH:mm:ss").format(calendar.getTime());
 }

当前时间为：2017-03-28 23:42:06 
下一小时为：2017-03-29 00:42:06 
对比结果为：-1 
对比结果为：1 
对比结果为：0