java how to get unix timestamp

/**
 * @author lautturi.com 
 * Java example: get unix timestamp in java
 */

import java.util.*;
import java.io.File;

public class Lautturi {

	public static void main(String[] args) {
		
		long unixTime = System.currentTimeMillis() / 1000L; 
		System.out.println("unix timestamp: "+unixTime);
	}
}

output:

unix timestamp: 1669557842