Storing Data to two dimensional Array

Question

I have been working with a java, and wanted to Store the data in 2-d Array 12x2, Below shown is the way to Store the data: enter image description here

Below is the code for that i built,but unfortunately i am getting Exception

java.lang.ArrayIndexOutOfBoundsException: 4

String[][] netswtich=new String[12][2];

for(int i =0;i<4;i++)
              {
                  for(int j=4;j>0;j--)
                  {
                        if(i==j) 
                        {
                            continue;
                        }
                        netswtich[k][0]=ranArray[i];
                        netswtich[k][1]=ranArray[j];
                        k++;
                  }
              }

I assume the problem is with ranArray[...] You do not show what is inside ranArray and also not what the start value of k is... — André Schild
– André Schild, Commented Mar 18, 2013 at 8:14
It will cause exception because in your array you have used size of array to 12 i.e. i will goo to 0-11 but for 2nd dimension you have used 2 i.e. j will go to 0-1 but you are comparing j==4 — Abhinav Singh Maurya
– Abhinav Singh Maurya, Commented Mar 18, 2013 at 8:14
and how did you initialize ranArray? you might get an exception on ranArray[4] — Marco
– Marco, Commented Mar 18, 2013 at 8:14

cosmin.danisor · Accepted Answer · 2013-03-18 08:13:35Z

4

My guess you are getting array out of bounds on ranArray if the size of the vector is 4 you should start j from 3 to 0 for(int j=3;j>=0;j--)

answered Mar 18, 2013 at 8:13

cosmin.danisor

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hunger · Accepted Answer · 2013-03-18 08:14:21Z

0

This means that you want to access an array element which isnt there, e.g. you want to access ranArray[4] while ranArray only holds 4 (or less elements), which means that 3 is the last usable array element.

answered Mar 18, 2013 at 8:14

hunger

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2 Comments

Viral Parmar Over a year ago

but why can't it hold 5 elements..i mean starting from 0 1 2 3 4

hunger Over a year ago

If you define it as "String[] ranArray=new String[4];" that means that it can hold four elements. But since we start counting at 0 and not 1, this means that 3 is actually the fourth (and as such, the last) element: ranArray[0] ranArray[1] ranArray[2] ranArray[3] are the four usable elements. If you need more, just change the 4 to a 5 (or whatever else you need) at the definition.

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