hell> File f = new File("aardvark")
f ==> aardvark

jshell> f
f ==> aardvark

jshell> f.canRead()
$3 ==> true

jshell> f.canWrite()
$4 ==> true

jshell> f.canExecute()
$5 ==> false

jshell> f = new File("/bin/ls")
f ==> /bin/ls

jshell> f.canExecute()
$7 ==> true

jshell> f.canRead()
$8 ==> true

jshell> f.canWrite()
$9 ==> false

jshell> f = new File("heffalump")
f ==> heffalump

jshell> f.exists()
$11 ==> false

jshell> f.createNewFile()
$12 ==> true

jshell> f.getParent()
$13 ==> null

jshell> f.exists()
$14 ==> true

jshell> f.getParentFile()
$15 ==> null

jshell> f.isDirectory()
$16 ==> false

jshell> File g = new File(".")
g ==> .

jshell> g.listFiles()
$18 ==> File[7] { ./heffalump, ./ferret, ./bonobo, ./dingo, ./carical, ./aardvark, ./elephant }

jshell> for(File item: g.listFiles())
   ...> {
   ...> System.out.println(item);
   ...> }
./heffalump
./ferret
./bonobo
./dingo
./carical
./aardvark
./elephant

jshell> for(File item: g.listFiles())
   ...> {
   ...> System.out.println(item.getName());
   ...> }
heffalump
ferret
bonobo
dingo
carical
aardvark
elephant

jshell> f = new File("aardvark");
f ==> aardvark

jshell> f.isDirectory()
$22 ==> false

jshell> /exit
|  Goodbye