Question

Create an application that instantiates a 20?20 two-dimensional array of Date objects, populates it with random dates drawn from the range of 1/1/1970 to 12/31/2020, and then outputs the index and actual date of the row with the most recent date (relative to today) among all the rows and the index and actual date of the column with the oldest date (closest to 1/1/1970) among all the columns.

Answer 1

/************************************************ Your Code begin here **********************************************/

import java.util.*;

public class Random {
public static void main(String[] args) {
Date[][] date_arr = new Date[20][20];
for (int i = 0; i < 20; i++) {
for(int j=0; j<20;j++){
Date randomDate = createRandomDate(1970, 2020); //create the random date between 1970 and 2020
date_arr[i][j] = randomDate;
// System.out.println(date_arr[i][j]);
}
}
Date d2 = new Date(); //Create the most recent date as per system
Date d3;
  
long max=0;
long diff=18250;
int row_diff=0;
int col_diff=0;
int row_max=0;
int col_max=0;
int k=0;
for (int i = 0; i < 20; i++) {
for(int j=0; j<20;j++){
long difference = (date_arr[i][j].getTime()-d2.getTime())/86400000; /*Calculate tthe difference between date in terms of days if you convert a time to days, then divided by 86400000*/
long c= Math.abs(difference);
//int c = date_arr[i][j].compareTo(d2);
if (diff > c) {
diff=c;
row_diff=i;
col_diff=j;
}
if(c>max){
c=max;
row_max=i;
col_max=j;
}
}
}
  
System.out.println("most recent row index:" + row_diff + "most recent column index:"+ col_diff + "most recent date:\n"+ date_arr[row_diff][col_diff]);
System.out.println("most oldest row index:" + row_max + "most oldest column index:"+ col_max + "most oldest date:\n"+ date_arr[row_max][col_max]);
  
}

public static int createRandomIntBetween(int start, int end) {
  
return start + (int) Math.round(Math.random() * (end - start));
}

public static Date createRandomDate(int startYear, int endYear) {
int day = createRandomIntBetween(1, 28);
int month = createRandomIntBetween(1, 12);
int year = createRandomIntBetween(startYear, endYear);

return new Date(year-1900, month, day);
}
}

/*****************************************************Code ends Here**************************************/