I want to covert all files inside ROOT directory into java 8 stream of InputStream.

suppose there are a lot of files inside the ROOT

for example file OS:

```
ROOT
 |--> file1
 |--> file2

```

I want to do somethink but using java 8 with the best PERFORMANCE!!

```
List<InputStream> ins = new ArrayList<>();
File[] arr =  new File(ROOT).listFiles()
for(File file: arr){
  ins.add(FileUtils.openInputStream(file));
}

```