In some languages, Python, for example, one could directly iterate through an array:
for i in [1, 2, 3, 4]: print(i) I know Java can iterate through a variable by for (type var : var2), then is it possible to skip the variable and directly iterate an array? such as:
for (int i : [1, 2, 3, 4]) { System.out.println(i); } I want to iterate through an array without having to create a variable.
You need change the loop to this:
for (int i : new int[] {1, 2, 3, 4}) { // do something (4 iterations) } Credit: Jacob G.
If you really want to avoid using bracket syntax you can also do:
for (int i : Arrays.asList(1,2,3,4)) { System.out.println(i); } Which will effectively do the same thing as creating an Array, but instead you are iterating on a fixed size List.
Note: This answer is mainly just for knowledge, and in practice you should not do this and prefer using new int[]{} over importing the Arrays library and boxing the values as a List unnecessarily.
The more traditional way you might see asList() used would be similar to:
Arrays.asList(1,2,3,4).forEach(System.out::println); 
for (int i : new ArrayList<>(Arrays.asList(1,2,3,4))) {. Also, note that this is boxing the values, only to immediately unbox them again.
You could, of course create the following utility:
class ArrayUtils { static int[] of(int... array) { return array; } } And then static-import this method, using import static ArrayUtils.of. Now you have a rather short expression:
for (int i : of(1, 2, 3, 4)) { ... } I wouldn't, however, do this in a real-life scenario. I would instead just write an ol' skool
for (int i = 1; i <= 4; i++) { ... } or maybe
IntStream.rangeClosed(1, 4) 
[1, 2, 3, 4]supposed to be? There are no list literals in Java.for (int i : new int[] {1, 2, 3, 4})[1, 2, 3, 4]just as a demo.