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Tuesday, 30 August 2016

Chapter 9 Exercise 5, Introduction to Java Programming, Tenth Edition Y. Daniel LiangY.

9.5 (Use the GregorianCalendar class) Java API has the GregorianCalendar class
in the java.util package, which you can use to obtain the year, month, and day of a
date. The no-arg constructor constructs an instance for the current date, and the meth-
ods get(GregorianCalendar.YEAR) , get(GregorianCalendar.MONTH) ,
and get(GregorianCalendar.DAY_OF_MONTH) return the year, month, and day.
Write a program to perform two tasks:

  • Display the current year, month, and day.
  • The GregorianCalendar class has the setTimeInMillis(long) , which can be used to set a specified elapsed time since January 1, 1970. Set the value to 1234567898765L and display the year, month, and day.

package Chapter_09;

import java.util.Calendar;
import java.util.Date;
import java.util.GregorianCalendar;

public class Exercise_05 {

    public static void main(String[] args) {

        // current date
        System.out.println(new Date().toString());

        // display year month day using 1234567898765L from gregorian class
        GregorianCalendar calendar = new GregorianCalendar();
        calendar.setTimeInMillis(1234567898765L);

        // display the year, month, and day
        System.out.printf("Year: %d Month: %d Day: %d",
                calendar.get(Calendar.YEAR), calendar.get(Calendar.MONTH), calendar.get(Calendar.DATE));
    }
}

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