import
java.text.DateFormat;
import
java.text.ParseException;
import
java.text.SimpleDateFormat;
import
java.util.Calendar;
import
java.util.Date;
public class
HashtableDemo {
public static void main(String args[]) throws AssertionError,
ParseException {
DateFormat df = new SimpleDateFormat("dd-MM-yyyy");
//comparing date using compareTo method in Java
System.out.println("Comparing two Date in Java using CompareTo method");
compareDatesByCompareTo(df, df.parse("01-01-2012"),
df.parse("01-01-2012"));
compareDatesByCompareTo(df, df.parse("02-03-2012"),
df.parse("04-05-2012"));
compareDatesByCompareTo(df, df.parse("02-03-2012"),
df.parse("01-02-2012"));
//comparing dates in java using Date.before, Date.after and
Date.equals
System.out.println("Comparing two Date in Java using Date's before, after and
equals method");
compareDatesByDateMethods(df, df.parse("01-01-2012"),
df.parse("01-01-2012"));
compareDatesByDateMethods(df, df.parse("02-03-2012"),
df.parse("04-05-2012"));
compareDatesByDateMethods(df, df.parse("02-03-2012"),
df.parse("01-02-2012"));
//comparing dates in java using Calendar.before(),
Calendar.after and Calendar.equals()
System.out.println("Comparing two Date in Java using Calendar's before, after
and equals method");
compareDatesByCalendarMethods(df, df.parse("01-01-2012"),
df.parse("01-01-2012"));
compareDatesByCalendarMethods(df, df.parse("02-03-2012"),
df.parse("04-05-2012"));
compareDatesByCalendarMethods(df, df.parse("02-03-2012"),
df.parse("01-02-2012"));
}
public static void compareDatesByCompareTo(DateFormat df, Date oldDate, Date
newDate) {
//how to check if date1 is equal to date2
if (oldDate.compareTo(newDate) == 0) {
System.out.println(df.format(oldDate) + " and " +
df.format(newDate) + " are equal to each other");
}
//checking if date1 is less than date 2
if (oldDate.compareTo(newDate) < 0) {
System.out.println(df.format(oldDate) + " is less than " +
df.format(newDate));
}
//how to check if date1 is greater than date2 in java
if (oldDate.compareTo(newDate) > 0) {
System.out.println(df.format(oldDate) + " is greater than
" + df.format(newDate));
}
}
public static void compareDatesByDateMethods(DateFormat df, Date oldDate, Date
newDate) {
//how to check if two dates are equals in java
if (oldDate.equals(newDate)) {
System.out.println(df.format(oldDate) + " and " +
df.format(newDate) + " are equal to each other");
}
//checking if date1 comes before date2
if (oldDate.before(newDate)) {
System.out.println(df.format(oldDate) + " comes before " +
df.format(newDate));
}
//checking if date1 comes after date2
if (oldDate.after(newDate)) {
System.out.println(df.format(oldDate) + " comes after " +
df.format(newDate));
}
}
public static void compareDatesByCalendarMethods(DateFormat df, Date oldDate, Date
newDate) {
//creating calendar instances for date comparision
Calendar oldCal = Calendar.getInstance();
Calendar newCal = Calendar.getInstance();
oldCal.setTime(oldDate);
newCal.setTime(newDate);
//how to check if two dates are equals in java using Calendar
if (oldCal.equals(newCal)) {
System.out.println(df.format(oldDate) + " and " +
df.format(newDate) + " are equal to each other");
}
//how to check if one date comes before another using Calendar
if (oldCal.before(newCal)) {
System.out.println(df.format(oldDate) + " comes before " +
df.format(newDate));
}
//how to check if one date comes after another using Calendar
if (oldCal.after(newCal)) {
System.out.println(df.format(oldDate) + " comes after " +
df.format(newDate));
}
}
}
Output:
Comparing
two Date in Java using CompareTo method
01-01-2012 and 01-01-2012 are equal to each other
02-03-2012 is less than 04-05-2012
02-03-2012 is greater than 01-02-2012
Comparing two Date in Java using Date's before, after and equals method
01-01-2012 and 01-01-2012 are equal to each other
02-03-2012 comes before 04-05-2012
02-03-2012 comes after 01-02-2012
Comparing two Date in Java using Calendar's before, after and equals method
01-01-2012 and 01-01-2012 are equal to each other
02-03-2012 comes before 04-05-2012
02-03-2012 comes after 01-02-2012
Source: roseIndia.net
Just collecting notes & sharing..
