Fill arrays with ranges of numbers

Question

Is there any syntax/package allowing quick filling of java arrays with ranges of numbers, like in perl?

e.g.

int[] arr = new int[1000]; arr=(1..500,301..400,1001..1400); // returns [1,2,3,4,...,500,301,302,...,400,1001,1002,...1400] 

Also, it here a package that allows getting the n-th number in such list of numbers as the above, without actually creating the array (which can be huge)?

e.g.

BunchOfRangesType bort = new BunchOfRangesType("1..500","301..400","1001..1400"); bort.get(0); // return 1 bort.get(500); // return 301 bort.get(501); // return 302 

It's not too difficult to implement, but I guess it might be common so maybe it was already done.

Answer 1

For those still looking for a solution:

In Java 8 or later, this can be answered trivially using Streams without any loops or additional libraries.

int[] range = IntStream.rangeClosed(1, 10).toArray(); 

This will produce an array with the integers from 1 to 10.

A more general solution that produces the same result is below. This can be made to produce any sequence by modifying the unary operator.

int[] range = IntStream.iterate(1, n -> n + 1).limit(10).toArray(); 

Answer 2

There is dollar:

// build the List 10, 11, 12, 13, 14 List<Integer> list2 = $(10, 15).toList(); 

maven:

<dependency>         <groupId>org.bitbucket.dollar</groupId>         <artifactId>dollar</artifactId>         <version>1.0-beta3</version> </dependency>