Get Month Name

Map the given integer to a month.

Explanation

For month = 1, the output should be

getMonthName(month) = "Jan"

For month = 0, the output should be

getMonthName(month) = "invalid month"

Solution

import java.util.Locale;
import java.text.DateFormatSymbols;

public class MonthNamer {

  private final static INVALID_MONTH_LABEL = "invalid month";

  private String getMonthName(Integer month){		
	if(month < 1 || month > 12){
	  return INVALID_MONTH_LABEL;
	}
	return new DateFormatSymbols(Locale.ENGLISH).getShortMonths()[month-1];
  }

  public static void main(String[] args){
	Integer month = 1;
	String result = new MonthNamer().getMonthName(month);
	assert result == 'Jan'
  }
	
}

To download the code:

git clone https://github.com/josdem/algorithms-workshop.git
cd get-month-name

To run the code:

javac MonthNamer.java
java -ea MonthNamer

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