Java: convert string date to month name year (MMM yyyy)

I'm new to Java I am trying to convert the date from string to MMM yyyy format (March 2016) I tried this

Calendar cal=Calendar.getInstance();
SimpleDateFormat month_date = new SimpleDateFormat("MMM yyyy");
String month_name = month_date.format(cal.getTime());
System.out.println("Month :: " + month_name);  //Mar 2016

It works normally But when I use it

String actualDate = "2016-03-20";

It doesn't work Help me how to solve this problem

Solution

Your format must match your input

2016-03-20

The format should be (use only the second simpledateformat object)

SimpleDateFormat sdf = new SimpleDateFormat("yyyy-MM-dd");

Complete answer

SimpleDateFormat month_date = new SimpleDateFormat("MMM yyyy",Locale.ENGLISH);
SimpleDateFormat sdf = new SimpleDateFormat("yyyy-MM-dd");

String actualDate = "2016-03-20";

Date date = sdf.parse(actualDate);

String month_name = month_date.format(date);
System.out.println("Month :" + month_name);  //Mar 2016

Using Java time java-8

String actualDate = "2016-03-20";
DateTimeFormatter dtf = DateTimeFormatter.ofPattern("yyyy-MM-dd",Locale.ENGLISH);
DateTimeFormatter dtf2 = DateTimeFormatter.ofPattern("MMM yyyy",Locale.ENGLISH);
LocalDate ld = LocalDate.parse(actualDate,dtf);
String month_name = dtf2.format(ld);
System.out.println(month_name); // Mar 2016