Array in Descending Reverse order in Java

Question

How to sort these years in Descending Order in Java ?
Sample input :

1 1996 2 2015 3 2000

Expected output :

ID: 2 (2015)
ID: 3 (2000)
ID: 1 (1998)

Below is the code I have tried so fare:

import java.util.Collections;
import java.util.Scanner;

public class ArrayYear {

  public static void main(String[] args) {

    Scanner in = new Scanner(System.in);
    int[] arr = new int[3];
    int[] year = new int[3];

    // read element into array
    for (int i = 0; i < arr.length; i++)
    {
      // input value
      arr[i] = in.nextInt(); 
      year[i] = in.nextInt();
    }

    // reverse array 
    for (int j = i + 1; j < year.length ; ++j)
    {
      if ( year[i] < year[j])
      {
        int temp = year[i];
        year[i] = year[j];
        year[j] = temp;
      }
    }

    for (int i = 0; i < arr.length; i++)
    {
      // print array
      System.out.println("ID :" + arr[i] + "(" + year[i] + ")");
    }
  }
}

You would need to sort the array in reverse order before printing it, right? — blurfus, Oct 26 '15 at 21:48
Possible duplicate of [Sorting an array of Strings with Java](http://stackoverflow.com/questions/12986386/sorting-an-array-of-strings-with-java) — blurfus, Oct 26 '15 at 21:49
You may need to call `Collections.sort(list, Collections.reverseOrder());` — MaxZoom, Oct 26 '15 at 22:55

score 1 · Answer 1 · answered Oct 26 '15 at 21:59

1

Try should work for array reversing

for (int i = arr.length; i = 0; i--)
  {
   // print array
   System.out.println("ID :" + arr[i] + "(" + year[i] + ")");
  }

answered Oct 26 '15 at 21:59

Ikelie Cyril

130
7

should be "for (int i = arr.length-1; i >= 0; i--)" – Eddie Oct 26 '15 at 22:06
Yes @ Eddie... Should have given it a second thought – Ikelie Cyril Oct 26 '15 at 22:10

score 0 · Accepted Answer · answered Oct 26 '15 at 23:59

import java.util.Collections;
import java.util.Scanner;

public class ArrayYear {

    public static void main(String[] args) {

    Scanner in = new Scanner(System.in);
    int[] arr = new int[3];
    int[] year = new int[3];

    // read element into array
    for (int i = 0 ; i < arr.length; i++)
    {
     // input value
     arr[i] = in.nextInt(); 
     year[i] = in.nextInt();

      // reverse array year[i] in descending order
     for (int j = 0 ; j < year.length ; j++)
      {
        if ( year[i] < year[j] )
        {
        int temp = year[i];
        year[i] = year[j];
        year[j] = temp;
        }
      }                 
    }

      for (int i = arr.length-1 ; i >= 0 ; i--)
      {
      // print array
       System.out.println("ID :" + arr[i] + "(" + year[i] + ")");   
      }
   }
}
      //my output :      
      ID :3(2001)
      ID :2(2000)
      ID :1(1988)

      //sample output:
      ID: 2 (2001)
      ID: 3 (2000)
      ID: 1 (1998)

how to make the first array element hold the second array element ? — anastasialela, Oct 27 '15 at 00:00

Array in Descending Reverse order in Java

2 Answers2