checking a string in array

Question

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In Java, how can I test if an Array contains a certain value?

I want to check for a string S whether it is present in string array or not. Is there any direct method to do so ?

EDIT

If the answer excludes the use of List then that would be better.

If by *"direct"* you mean a one-liner, then no. `ArrayList` and some other collections have a `contains()` method that absracts away the details. — Andrew Thompson, May 25 '12 at 09:53
@Andrew Thompson i could use `indexOf()` for this. but i have to check all the rows in column number 0 in the 2-D String array against a string. Is there any way i can use `indexOf` with it ? — program-o-steve, May 25 '12 at 09:59

score 2 · Answer 1 · edited May 23 '17 at 11:53

2

There are a couple of ways to accomplish this using the Arrays utility class.

If the array is not sorted:

java.util.Arrays.asList(theArray).indexOf(o)

If the array is sorted, you can make use of a binary search for performance:

java.util.Arrays.binarySearch(theArray, o)

edited May 23 '17 at 11:53

Community

answered May 25 '12 at 09:53

Subir Kumar Sao

or even simple `Arrays.asLIst(array).contains(key)` – jmj May 25 '12 at 09:54
i want to check the first column for a 2-d array – program-o-steve May 25 '12 at 10:15

score 0 · Answer 2 · answered May 25 '12 at 09:53

0

You can convert it to List and check: Arrays.asList(arrayVariable).contains(S)

answered May 25 '12 at 09:53

Jan Zyka

2 Answers2