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(base) MAC:Fri Oct 08:14:42:~> jshell
|  Welcome to JShell -- Version 15.0.1
|  For an introduction type: /help intro

jshell> //Arrays

jshell> int[] arr = new int[10];
arr ==> int[10] { 0, 0, 0, 0, 0, 0, 0, 0, 0, 0 }

jshell> booolean[] arr = new boolean[10];
|  Error:
|  cannot find symbol
|    symbol:   class booolean
|  booolean[] arr = new boolean[10];
|  ^------^

jshell> boolean[] arr = new boolean[10];
arr ==> boolean[10] { false, false, false, false, false,  ... lse, false, false, false }

jshell> String[] foo = new String[10];
foo ==> String[10] { null, null, null, null, null, null, null, null, null, null }

jshell> arr[10]
|  Exception java.lang.ArrayIndexOutOfBoundsException: Index 10 out of bounds for length 10
|        at (#4:1)

jshell> arr[0]
$5 ==> false

jshell> arr[0] = true
$6 ==> true

jshell> arr
arr ==> boolean[10] { true, false, false, false, false, false, false, false, false, false }

jshell> //fixed size HOMOgeneous sequence type. Indexing by []

jshell> foo[0].length()
|  Exception java.lang.NullPointerException: Cannot invoke "String.length()" because "REPL.$JShell$12.foo[0]" is null
|        at (#8:1)

jshell> for(int k = 0; k < foo.length; k++){foo[k] = Integer.toString(k*k*k)}
|  Error:
|  ';' expected
|  for(int k = 0; k < foo.length; k++){foo[k] = Integer.toString(k*k*k)}
|                                                                      ^

jshell> for(int k = 0; k < foo.length; k++){foo[k] = Integer.toString(k*k*k);}

jshell> foo
foo ==> String[10] { "0", "1", "8", "27", "64", "125", "216", "343", "512", "729" }

jshell> System.out.println(foo);
[Ljava.lang.String;@7dc5e7b4

jshell> Arrays.toString(foo)
$12 ==> "[0, 1, 8, 27, 64, 125, 216, 343, 512, 729]"

jshell> foo[0] = "tapir";
$13 ==> "tapir"

jshell> Arrays.toString(foo)
$14 ==> "[tapir, 1, 8, 27, 64, 125, 216, 343, 512, 729]"

jshell> Arrays dead = new Arrays();
|  Error:
|  Arrays() has private access in java.util.Arrays
|  Arrays dead = new Arrays();
|                ^----------^

jshell> Math doomed = new Math()
|  Error:
|  Math() has private access in java.lang.Math
|  Math doomed = new Math();
|                ^--------^

jshell> /dig
|  Invalid command: /dig
|  Type /help for help.

jshell> exit
|  Error:
|  cannot find symbol
|    symbol:   variable exit
|  exit
|  ^--^

jshell>