how to copy elements in an array into sub arrays

Question

I am trying do a grouping for a football tournament, but I don't know how to copy from the main array into sub arrays.

string [] groupings = {Arsenal, Chelsea, Barcelona, Real Madrid, Valencia, Juventus, Manchester United, Liverpool}

I want it in such a way that it will pick the first four and put in group one, and the last four in another group. e.g

string [] group 1={ Arsenal, Chelsea, Barcelona, Real Madrid }
String [] group 2={Valencia, Juventus, Manchester United, Liverpool}

Please can anyone help me with this I am still new to programming.

Suresh Atta · Accepted Answer · 2015-08-29 13:54:46Z

4

Use Arrays class copyOfRange method.

For ex :

        String[] grp1 = Arrays.copyOfRange(groupings, 0, groupings.length / 2);
        String[] grp2 = Arrays.copyOfRange(groupings, groupings.length / 2,
                groupings.length);

        System.out.println(Arrays.toString(grp1));
        System.out.println(Arrays.toString(grp2));

edited Aug 29, 2015 at 13:54

answered Aug 29, 2015 at 13:46

Suresh Atta

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1 Comment

Suresh Atta Over a year ago

@JonSkeet Edited, my mistake.

Wololo · Accepted Answer · 2015-08-29 14:05:54Z

0

You can use loops. Like

string [] groupings = {Arsenal, Chelsea, Barcelona, Real Madrid, Valencia,
                       Juventus, Manchester United, Liverpool};
String[] grp1 = new String[4];
String[] grp2 = new String[4];
for(int i = 0; i<4; i++) {
  grp1[i] = groupings[i];
}
for(int i = 0; i<4; i++) {
  grp2[i] = groupings[4+i];
}

answered Aug 29, 2015 at 14:05

Wololo

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Comments

burglarhobbit · Accepted Answer · 2015-08-29 14:18:21Z

0

You can write your algorithm like this...

String[] grp1 = new String[groupings.length/2];
String[] grp2 = new String[groupings.length/2];

for(int i = 0; i<groupings.length/2; i++) {
    grp1[i] = groupings[i];
    grp2[i] = groupings[(groupings.length/2)+i];
}

This will complete your task in just a single for loop and this algorithm will be dynamic for creating 2 groups for any given size of array(even).

edited Aug 29, 2015 at 14:18

answered Aug 29, 2015 at 14:12

burglarhobbit

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