Java: Convert String Date to Month Name Year (MMM yyyy)

I am new to Java. I am trying to convert date from string to MMM yyyy format (Mar 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 is working fine. But when I use

String actualDate = "2016-03-20";

It is not working. Help me, how to solve this.

Answer

Your format must match your input

for 2016-03-20

the format should be (just use a second SimpleDateFormat object)

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

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Full 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

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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