IntStream.Builder build() in Java with Examples

IntStream.Builder is a helper interface in Java that is used to build a stream of primitive integers. It is a mutable container that can be used to add elements to the stream. The build() method is used to create an IntStream from the elements added to the builder.

Syntax:

IntStream.Builder builder = IntStream.builder();
builder.add(int value);
IntStream stream = builder.build();

Example 1: Creating an IntStream using IntStream.Builder

IntStream.Builder builder = IntStream.builder();
builder.add(1);
builder.add(2);
builder.add(3);
IntStream stream = builder.build();
stream.forEach(System.out::println);

Output:

1
2
3

Example 2: Creating an IntStream using IntStream.Builder with a loop

IntStream.Builder builder = IntStream.builder();
for (int i = 1; i <= 5; i++) {
    builder.add(i);
}
IntStream stream = builder.build();
stream.forEach(System.out::println);

Output:

1
2
3
4
5

Example 3: Creating an IntStream using IntStream.Builder with an array

int[] arr = {1, 2, 3, 4, 5};
IntStream.Builder builder = IntStream.builder();
for (int i : arr) {
    builder.add(i);
}
IntStream stream = builder.build();
stream.forEach(System.out::println);

Output:

1
2
3
4
5