Is it possible to run java code when activity is not launched?

I am working on an alarm java application. I want to run Alarm(); function when the systems clock arrives to the targetTime. But I want to do these even the application is not open. So somehow I want to run it in androids background.

My code :

void AlarmCheck (DateTimeAlarm currentTime, DateTimeAlarm targetTime)
{
    if(!targetTime.alarmed && currentTime.day == targetTime &&
        currentTime.hour == targetTime.hour && currentTime.minute >= targetTime.minute)
    {
        targetTime.alarmed = true;
        Alarm();
    }
}

And this is the class for the DateTimeAlarm :

public class DateTimeAlarm
{
    public int day;
    public int hour;
    public int minute;
    public bool alarmed = false;

    public DateTimeAlarm(int day, int hour, int minute)
    {
        this.day = day;
        this.hour = hour;
        this.minute= minute;
    }
}

I have no idea where to put this code PLEASE HELP ME.

I am new to java so please explain easily. thank you for any suggesions.

Answer

This is the time when you start learning about services. If you want long running operations in background, you must make a service to do that for you. I leave the link to the official site for you. https://developer.android.com/guide/components/services

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Answer