The withHour() method of a LocalTime class is used to get a copy of this LocalTime with the hours changed to the hours passed as the parameter to this method. The remaining values of this LocalTime will remain the same. This instance is immutable and unaffected by this method call.
Syntax:
public LocalTime withHour(int hour)
Parameters: This method accepts a single parameter hour which represents the hour-of-day to set in the result, from 0 to 23.
Return value: This method returns a LocalTime instance based on this time with the requested hour.
Exception: This method throws a exception DateTimeException if the hour value is invalid
Below programs illustrate the withHour() method:
Program 1:
// Java program to demonstrate// LocalTime.withHour() method  import java.time.*;  public class GFG {    public static void main(String[] args)    {          // create a LocalTime object        LocalTime time            = LocalTime.parse("19:34:50.63");          // print time        System.out.println("Old LocalTime: "                           + time);          // Get a new LocalDateTime with hours 4        LocalTime newtime = time.withHour(4);          // print result        System.out.println("New LocalDateTime: "                           + newtime);    }} |
Old LocalTime: 19:34:50.630 New LocalDateTime: 04:34:50.630
Program 2:
// Java program to demonstrate// LocalTime.withHour() method  import java.time.*;  public class GFG {    public static void main(String[] args)    {          // create a LocalTime object        LocalTime time            = LocalTime.parse("01:21:30.13");          // print time        System.out.println("Old LocalTime: "                           + time);          // Get a new LocalDateTime with hours 23        LocalTime newtime = time.withHour(23);          // print result        System.out.println("New LocalDateTime: "                           + newtime);    }} |
Old LocalTime: 01:21:30.130 New LocalDateTime: 23:21:30.130
References: https://docs.oracle.com/javase/10/docs/api/java/time/LocalTime.html#withHour(int)
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