How can you sort dates?

Question Posted / sarath kumar ch

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How can you sort dates?..

Answer / nitesh

Right now two ways come to my mind.

First:
Create a TreeSet, add all the dates to it. They get
sorted by default since java.util.Date implements
comparable. Here is an example -->
Set<Date> sortedDates = new TreeSet<Date>();
sortedDates.add(new Date());
Calendar cal = Calendar.getInstance();
cal.set(2009, 2, 12);
sortedDates.add(cal.getTime());

Second:
We can use the compare method inside Date class
directly and write our own sorting implementation.

Is This Answer Correct ?

11 Yes

5 No

How can you sort dates?..

Answer / ravinder

import java.util.ArrayList;
import java.util.StringTokenizer;

public class DateSort {
public DateSort() {}

void dateSort() {
ArrayList dateData = new ArrayList();
String months[] = {"JAN","FEB","MAR","APR","MAY","JUN","JUL","AUG","SEP","OCT","NOV","DEC"};

dateData.add(0,"29-AUG-2008");
dateData.add(1,"13-FEB-2007");
dateData.add(2,"29-JAN-2008");

System.out.print("\nSorted Dates =\t");

for(int i=0;i<dateData.size();i++){
for(int j=0;j<(dateData.size()-1-i);j++){

StringTokenizer date1=new StringTokenizer((String)dateData.get(j),"-");
StringTokenizer date2=new StringTokenizer((String)dateData.get(j+1),"-");
String date01[] = new String[3];
String date02[] = new String[3];
int k=0;
ArrayList temp=new ArrayList();

while (date1.hasMoreTokens()) {
date01[k]=date1.nextToken();
date02[k]=date2.nextToken();
k++;
}
if(Integer.parseInt(date02[2]) < Integer.parseInt(date01[2])){
int t=0;
temp.add(t,dateData.get(j));
dateData.add(j,dateData.get(j+1));
dateData.add(j+1,temp.get(t));
temp.remove(t);
}
}
}
System.out.println(dateData.size());
for(int i=0;i<dateData.size();i++)
System.out.println(dateData.get(i));

}

public static void main(String args[]) {
DateSort Dates = new DateSort();

Dates.dateSort();
}
}

Is This Answer Correct ?

1 Yes

0 No

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