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Java Exercises: Display the current date time in specific format

Java Basic: Exercise-47 with Solution

Write a Java program to display the current date time in specific format.

Pictorial Presentation:

Java: Display the current date time in specific format

Sample Solution:

Java Code:

 import java.text.SimpleDateFormat;
import java.util.Calendar;
import java.util.TimeZone;

public class Exercise47 {

	public static void main(String args[]) {
		SimpleDateFormat cdt = new SimpleDateFormat("yyyy/MM/dd HH:mm:ss.SSS");
		cdt.setCalendar(Calendar.getInstance(TimeZone.getTimeZone("GMT")));
		
		System.out.println("\nNow: "+cdt.format(System.currentTimeMillis()));
	}
}

Sample Output:

Now: 2017/06/16 08:52:03.066  

Flowchart :

Flowchart: Java exercises: Display the current date time in specific format

Java Code Editor:

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Java: Tips of the Day

Try and catch:

Java is excellent at catching errors, but it can only recover gracefully if you tell it what to do. The cascading hierarchy of attempting to perform an action in Java starts with try, falls back to catch, and ends with finally. Should the try clause fail, then catch is invoked, and in the end, there's always finally to perform some sensible action regardless of the results. Here's an example:

try {
        cmd = parser.parse(opt, args); 
       
        if(cmd.hasOption("help")) {
                HelpFormatter helper = new HelpFormatter();
                helper.printHelp("Hello ", opt);
                System.exit(0);
                }
        else {
                if(cmd.hasOption("shell") || cmd.hasOption("s")) {
                String target = cmd.getOptionValue("tgt");
                } // else
        } // fi
} catch (ParseException err) {
        System.out.println(err);
        System.exit(1);
        } //catch
        finally {
                new Hello().helloWorld(opt);
        } //finally
} //try

It's a robust system that attempts to avoid irrecoverable errors or, at least, to provide you with the option to give useful feedback to the user. Use it often, and your users will thank you!

Ref: https://red.ht/3EZc9OC