Simple: Adding index to a Java array

Question

I'm currently learning Java and refreshing what I've previously learn t, I'm making a quick test array in this class but want to add an index onto the array so the output has a number for the peanuts left. so ideally the array would start at 5 and count down.

I remember it being a few lines of code, but what those are.... has escaped me.

 public class Testing123 {

     public static void main(String[] args){

         String p = " Peanuts left in the jar.";


         int[] anArray = new int[5];

         for(int i=0; i<anArray.length; ++i){
             int index = 0;
             System.out.println(anArray[i] + p);
             ++index;

         }

     }


 }

Where are you "filling values" for anArray ?. Also your i is same as yout index. No point in keeping 2 variables in the loop doing the same job. — TheLostMind
– TheLostMind, Commented Mar 12, 2014 at 6:03
what on earth are you doing with the index variable? It is not even being used. — Scary Wombat
– Scary Wombat, Commented Mar 12, 2014 at 6:04

RaviSun66 · Accepted Answer · 2014-03-12 06:31:22Z

1

try this..

 public class Testing123 {

 public static void main(String[] args){

     String p = " Peanuts left in the jar.";


     int[] anArray = new int[5];

     for(int i=(anArray.length -1); i >= 0; --i){

         System.out.println(anArray[i] + p);


     }

 }

}

answered Mar 12, 2014 at 6:31

RaviSun66

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Comments

Scary Wombat · Accepted Answer · 2014-03-12 06:12:38Z

0

why not simplify to

public static void main(String[] args){

     String p = " Peanuts left in the jar.";

     int i = 5;
     while (i-- > 0){
         System.out.println(i + p);
     }

 }

or if you really want an array

int index = 5;
for (int i = 0; i < anArray.length; ++i)
{
        anArray[i] = index--;
        System.out.println(anArray[i] + p);
}

edited Mar 12, 2014 at 6:12

answered Mar 12, 2014 at 6:07

Scary Wombat

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Comments

sumanr · Accepted Answer · 2014-03-12 06:12:59Z

0

Firstly, you need to initialize the array.

Secondly, change the for loop.

Also i dont understand the need of index variable.

 //int[] anArray = new int[5]; -instead do 
   int[] anArray = new int[]{1,2,3,4,5};
   for(int i=anArray.length; i>0; i--){
         // int index = 0;  - i dont think you need this..what are you using this for ?
         System.out.println(anArray[i] + p);
         // ++index; - i dont think you need this..what are you using this for ?. 
         //You are initalizing this everytime in the for loop and incrementing. The value will always be 1 or 0.

     }

answered Mar 12, 2014 at 6:12

sumanr

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Comments

newuser · Accepted Answer · 2014-03-12 06:14:45Z

0

Try this,

        for (int i = 0; i < anArray.length; ++i)
        {
            anArray[i] = i;
            System.out.println(anArray[i] + p);
        }

edited Mar 12, 2014 at 6:14

answered Mar 12, 2014 at 6:08

newuser

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1 Comment

newuser Over a year ago

Thanks but the questionare doesnt say anything what he expect.

mig · Accepted Answer · 2014-03-12 06:16:26Z

0

this would work for you:

public static void main(String[] args){
  String p = " Peanuts left in the jar.";
  int[] anArray = {5,4,3,2,1,0};
  for(int i=0; i<anArray.length; ++i){
      System.out.println(anArray[i] + p);
  }
}

edited Mar 12, 2014 at 6:16

answered Mar 12, 2014 at 6:09

mig

1527 bronze badges

4 Comments

Scary Wombat Over a year ago

get rid of index will ya.

mig Over a year ago

i did, it was seconds after i posted that i realized it was still there

Scary Wombat Over a year ago

well it has come back, because it is still there - scary ain't it.

mig Over a year ago

weird, they are out to get me i tell you

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