I have got a 2d String array. How can I check a slice of it? For example row 3, up to 6th element there
I have tried
String arr[][] = new String[3][6]
arr[3][4] = "example"
if (Arrays.asList(arr).subList(3,6).contains("example"))
System.out.print("yes");
But this doesn't work. It works only for 1d array? Also, instead of using contains how can one check whether all elements are null in the slice array?
First of all, arrays are zero-indexed in Java, so if you declare an array with first dimension 3, the maximum index is 2.
Second, if you want to look at the slices of the third row, you should specify the index 2 explicitly before converting to a list.
import java.util.*;
public class ArrayGame {
public static void main(String[] args) {
String arr[][] = new String[3][6];
arr[2][4] = "example";
if (Arrays.asList(arr[2]).subList(3,6).contains("example"))
System.out.println("yes");
}
}
Output:
yes
Look in javadoc Arrays:
Arrays.copyOfRange(T[] original, int from, int to)
where
original is, for example, arr[3]
from is 0
to is 7
http://docs.oracle.com/javase/7/docs/api/java/util/Arrays.html#copyOfRange%28T[],%20int,%20int%29
The curent way to do it is just :
if (Arrays.asList(arr[3]).contains("example"))
System.out.print("yes");
Good luck!
You declare that String arr[][] = new String[3][6], it means simply 3 rows 6 columns structure.
Can assign value, in this case row,
arr[0][...] = <assigned-value> //row 1arr[1][...] = <assigned-value> //row 2arr[2][...] = <assigned-value> //row 3But it will not work as you expected
arr[3][4] = "example" //row 4, here throwing ArrayIndexOutOfBoundsException 
array[3][6], what you mean bu slicing further ?arr[3]?