java join elements in array

Question

Suppose I have an int array:

intarray = [2,3,5,7,8,8,9,3...]

how to join the first 5 elements there or others?

for instance, I would have the numbers 23578 or 35788 or 57889...?

I'm trying to do it because I need to compare the numbers with each other

by the way, I'm still looking for great source that keep all docs about java language

Your documentation search can start here, if you didn't try it already. — Fritz
– Fritz, Commented Feb 14, 2013 at 11:52
What have you tried? Here is the current Java Documentation and the current Java Language Specification. Also, your task can be accomplished fairly easy by multiplying by 10. — jlordo
– jlordo, Commented Feb 14, 2013 at 11:53
I do not just know, which method a should use here, I found methods that help join arrays rather than elements into the only one array — Leo
– Leo, Commented Feb 14, 2013 at 11:55

Armen Tsirunyan · Accepted Answer · 2013-02-14 11:54:18Z

2

pseudocode:

    int frstNumber = 0;
    for i = 0 to 4
         firstNumber *= 10;
         firstNumber += array[i];

    nextNumber = firstNumber
    for i = 5 to end of array
         nextNumber = (nextNumber mod 10000) * 10 + array[i]

answered Feb 14, 2013 at 11:54

Armen Tsirunyan

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Achintya Jha · Accepted Answer · 2013-02-14 12:07:22Z

2

public static void main(String[] args) {
    int[] intarray = new int[] { 2, 3, 5, 7, 8, 8, 9, 3 };

    for (int j = 0; j < intarray.length - 4; j++) {
        String s = "";
        for (int i = j; i < j + 5; i++) {
            s = s + String.valueOf(intarray[i]);
        }
        int value = Integer.parseInt(s);
        System.out.println(value);
    }
}

Output:

edited Feb 14, 2013 at 12:07

answered Feb 14, 2013 at 11:55

Achintya Jha

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5 Comments

Leo Over a year ago

exactly, then I would make all of the possibility variants, in your case the output data should be: 23578, 35788,57889,78893

Leo Over a year ago

hm, It's a bit strange, It doesn't work properly, you know. for example, if we consider a string "String ="731637176513306249192251196744265747423553491949349698352";" we'll get a 6249 number among all values

Achintya Jha Over a year ago

@user1813163 What you mean? We are using Array here not String.

Leo Over a year ago

sorry, I couldn't to insert a code in my comment correctly, I didn't get hot to insert my code in order to it will easy to read ;(

Achintya Jha Over a year ago

@user1813163 6249 is integer before 6 there is 0 so it prints 6249. If you want o print "06246" you can by directly print s.

David Roussel · Accepted Answer · 2013-02-14 12:01:00Z

1

If you want to use a library, and work at a higher level, try Guava.

    int[] ary = {7,4,1,2,5,8,9,3};
    Iterable<int[]> first5 = Iterables.limit(Lists.newArrayList(ary), 5);
    String joined = Joiner.on("").join(first5);

See Iterables.limit()

answered Feb 14, 2013 at 12:01

David Roussel

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Comments

Ring · Accepted Answer · 2014-02-18 20:33:39Z

0

StringUtils.join([1, 2, 3], null) = "123"

from apache commons-lang

answered Feb 18, 2014 at 20:33

Ring

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