afzalex :
What is the best way to convert Integer array to int array.
The simple solution for it would be :
public int[] toPrimitiveInts(Integer[] ints) {
int[] primitiveInts = new int[ints.length];
for(int i = 0; i < ints.length; i++) {
primitiveInts[i] = ints[i] == null ? 0 : ints[i];
}
return primitiveInts;
}
In the above example I taken 0 for null values for the fact that default value for objects/wrappers is null and for int is 0.
This answer shows how to convert int[] to Integer[]
But I don't find an easy way to convert Integer[] to int[].
Eran :
You can use Java 8 Streams:
If the input array has no nulls:
Integer[] integerArr = ...
int[] arr = Arrays.stream(integerArr).mapToInt(Integer::intValue).toArray();
And with handling of nulls:
Integer[] integerArr = ...
int[] arr = Arrays.stream(integerArr).mapToInt(i -> i != null ? i : 0).toArray();
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