Combining two different arrays in java

Question

I really wanted to combine my two arrays and I really do not know what is wrong with my code it keeps giving me this results:

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Exception in thread "main" java.lang.ArrayIndexOutOfBoundsException: 20
    at javaDay3.ArrayExpanding.main(ArrayExpanding.java:17)

The results I want to view is :

Please help me to find what is wrong with my code: I wanted to combine the two arrays manually using loops

package javaDay3;    
public class ArrayExpanding {    
    public static void main(String[] args) {            
        int ages [] = {0,1,2,3,4,5,6,7,8,9}; // my first array
        for( int i = 0; i < ages.length; i++) {         
         int temp [] = new int [20];// my bigger and 2nd array
         for(int ix = 0; ix < temp.length; ix++) {          
          for(int ixx = 0; ixx <= temp.length; ixx++) {
            temp [0] = ages [0] ;               
            System.out.println(temp[ixx]);
          }
         }
        }
      }
}

should I add or remove something please help me I am using Eclipse and taking Java

I am not sure what are you trying to do here? Do you want to put all elements in ages[] to temp[]? — Ruchira Gayan Ranaweera
– Ruchira Gayan Ranaweera, Commented Jul 17, 2015 at 11:32
What do you want to do with this code? Combining two arrays or just reading one index by index? I don't really understand your code :D — user5118384
– user5118384, Commented Jul 17, 2015 at 11:34
Change ixx <= temp.length to ixx < temp.length. There it jumps out of bounds. No clue why that loop is even there, because you have 2 loops with the same condition. — dly
– dly, Commented Jul 17, 2015 at 11:36

user5118384 · Accepted Answer · 2015-07-17 11:41:20Z

2

You could try this method:

static int[] addElement(int[] a, int e) {
    a  = Arrays.copyOf(a, a.length + 1);
    a[a.length - 1] = e;
    return a;
}

You give it the List (a) and the element you want to add (e) and it returns the list with the added Element.

If you want to do it for multiple items you can just loop it, something like this:

for(int i = 0; i < ages.length; i++) {
    addElement(temp, ages[i]);
}

answered Jul 17, 2015 at 11:41

user5118384

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Comments

Ruchira Gayan Ranaweera · Accepted Answer · 2015-07-17 11:50:34Z

If you want to put all element in ages[] to temp[], you can follow these steps.

let say you have two arrays as follows.

int ages[] = {0, 1, 2, 3, 4, 5, 6, 7, 8, 9};
int temp[] = new int[20];

2.Then iterate the ages array and assign value of each element to temp array

    for(int i = 0; i < ages.length; i++) {
        temp[i]=ages[i];
    }

3. Now your temp array contains what you want. You can print temp array either

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

Or

    System.out.println(Arrays.toString(temp));

Eg:

    int ages[] = {0, 1, 2, 3, 4, 5, 6, 7, 8, 9};
    int temp[] = new int[20];
    for (int i = 0; i < ages.length; i++) {
        temp[i]=ages[i];
    }
    for(int i=0;i<temp.length;i++){
        System.out.println(temp[i]);
    }

Ankur Singhal · Accepted Answer · 2015-07-17 11:38:20Z

0

This is what you want,

public static void main(String[] args) {

        int ages[] = { 0, 1, 2, 3, 4, 5, 6, 7, 8, 9 };
        for (int i = 0; i < ages.length; i++) {
            // System.out.println(ages[i]);
        }

        int temp[] = new int[20];
        for (int ix = 0; ix < temp.length; ix++) {

        }

        for (int ixx = 0; ixx < temp.length; ixx++) {
        if (ages.length > ixx) {
            temp[ixx] = ages[ixx];
        }
        System.out.println(temp[ixx]);
    }

    }

output

answered Jul 17, 2015 at 11:38

Ankur Singhal

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Comments

2787184 · Accepted Answer · 2015-07-17 11:41:23Z

0

Use arraycopy method from System class.

int[] ages = { 0, 1, 2, 3, 4, 5, 6, 7, 8, 9 };
int[] temp = new int[20];
System.arraycopy(ages, 0, temp, 0, ages.length);
System.out.println(Arrays.toString(temp));

answered Jul 17, 2015 at 11:41

2787184

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Comments

Uma Kanth · Accepted Answer · 2015-07-17 11:43:45Z

0

To copy from one array to another, loop through the array and assign it to the other.

 int a[] = { 1, 2, 3, 4, 5, 6 };
 int temp[] = new int[a.length];

 for (int i = 0; i < a.length; i++) {
     temp[i] = a[i];
   }

answered Jul 17, 2015 at 11:43

Uma Kanth

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Comments

Thomas D. K. Teixeira · Accepted Answer · 2015-07-17 11:43:50Z

0

Just remove the "equals".

Change the line:

for (int ixx = 0; ixx <= temp.length; ixx++) {

with this:

for (int ixx = 0; ixx < temp.length; ixx++) {

answered Jul 17, 2015 at 11:43

Thomas D. K. Teixeira

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Comments

SatyaTNV · Accepted Answer · 2015-07-17 11:46:49Z

0

  for(int ix = 0; ix < temp.length; ix++) 
  {
    if(ages.length>ix)//ages having lengh 10
        temp [ix] = ages [ix] ;
        else
        temp [ix] = 0 ;//if ages length exceeds
        System.out.println(temp[ix]);       
  }

Output:

edited Jul 17, 2015 at 11:46

answered Jul 17, 2015 at 11:41

SatyaTNV

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