Run background scheduled tasks in Spring

public @interface Scheduled {
 
    String cron() default "";
 
    String zone() default "";
 
    long fixedDelay() default -1;
 
    String fixedDelayString() default "";
 
    long fixedRate() default -1;
 
    String fixedRateString() default "";
 
    long initialDelay() default -1;
 
    String initialDelayString() default "";

}

package org.o7planning.sbschedule.config;

import org.springframework.context.annotation.Configuration;
import org.springframework.scheduling.annotation.EnableScheduling;

@Configuration
@EnableScheduling
public class SchedulerConfig {

	// Declaring the beans are related to the schedule here if necessary.
}

package org.o7planning.sbschedule.schedule;

import java.text.DateFormat;
import java.text.SimpleDateFormat;
import java.util.Date;

import org.springframework.scheduling.annotation.Scheduled;
import org.springframework.stereotype.Component;

@Component
public class WriteCurrentTimeSchedule {

    private static final DateFormat df = new SimpleDateFormat("yyyy-MM-dd HH:mm:ss sss");
    
    
    // initialDelay = 3 second.
    // fixedDelay = 2 second.
    @Scheduled( initialDelay = 3 * 1000, fixedDelay = 2 * 1000)
    public void writeCurrentTime() {
        
        Date now = new Date();
        
        String nowString = df.format(now);
        
        System.out.println("Now is: "+ nowString);
        
    }

}

// miliseconds.
@Scheduled(fixedDelay = 2 * 1000, initialDelay = 30 * 1000)
public void writeCurrentTime() {
   // Do something ..
}

second, minute, hour, day of month, month, day(s) of week

"0 0 * * * *" // the top of every hour of every day.

"*/10 * * * * *" // every ten seconds.

"0 0 8-10 * * *" // 8, 9 and 10 o'clock of every day.

"0 0/30 8-10 * * *" // 8:00, 8:30, 9:00, 9:30 and 10 o'clock every day.

"0 0 9-17 * * MON-FRI" // on the hour nine-to-seventeen, and monday to friday

"0 0 0 25 12 ?" // every Christmas Day at midnight

@Scheduled(cron="0 1 1 * * *", zone="Europe/Istanbul")

public void doScheduledWork() {
    // Do something here
}

"0 20 1 * * MON-THU"

package org.o7planning.sbschedule.schedule;

import org.springframework.scheduling.annotation.Scheduled;
import org.springframework.stereotype.Component;

@Component
public class CronSchedule {

    @Scheduled(cron = "0 20 1 * * MON-THU")
    public void doSomething() {

        System.out.println("Do some thing");

    }

}