mercredi 1 février 2017

List Java contains doesn't work as expected

List Java contains doesn't work as expected

I have this code not working as expexted:

import java.util.Arrays;
import java.util.List;

public class Test {
static int[] listm = { 2,3,5 };

public static void main(String[] args) {

contains(listm, 2);
}

public static boolean contains(int[] array, int key) {

List l = Arrays.asList(array);
boolean contain = l.contains(key);
System.out.println("" + contain);
return contain;
}

}

it returns  false,even the item 2 is found on the collection listm .

To resolve this problem,we must change the generic value of the collection to Integer.

The code become like this.


public class Test {
static Integer[] listm = { 2,3,5 };

public static void main(String[] args) {

contains(listm, 2);
}

public static boolean contains(Integer[] array, int key) {

List<Integer> l = Arrays.asList(array);
boolean contain = l.contains(key);
System.out.println("" + contain);
return contain;
}

}








it works :)


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