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(base) MAC:Mon Apr 19:09:43:~> jshell
|  Welcome to JShell -- Version 15.0.1
|  For an introduction type: /help intro

jshell> Math.pow(3,5)
$1 ==> 243.0

jshell> Math.E
$2 ==> 2.718281828459045

jshell> Math.PI
$3 ==> 3.141592653589793

jshell> Math.PI = 3
|  Error:
|  cannot assign a value to final variable PI
|  Math.PI = 3
|  ^-----^

jshell> Math.cos(Math.PI)
$4 ==> -1.0

jshell> ArrayList<int> foo = new ArrayList<>();
|  Error:
|  unexpected type
|    required: reference
|    found:    int
|  ArrayList<int> foo = new ArrayList<>();
|            ^-^

jshell> ArrayList<Integer> foo = new ArrayList<>();
foo ==> []

jshell> foo.add(5);
$6 ==> true

jshell> foo
foo ==> [5]

jshell> foo.add(3443)
$8 ==> true

jshell> foo.add(42)
$9 ==> true

jshell> foo
foo ==> [5, 3443, 42]

jshell> //you can only make array lists of object types

jshell> //you can't make an array list of priimitive type

jshell> int quack = Integer.parseInt("345");
quack ==> 345

jshell> quack
quack ==> 345

jshell> Integer.toString(543)
$13 ==> "543"

jshell> Integer.toString(543, 16)
$14 ==> "21f"

jshell> Integer.toString(543, 2)
$15 ==> "1000011111"

jshell> Integer.toString(543, 6)
$16 ==> "2303"

jshell> Integer.MAZ_VALUE
|  Error:
|  cannot find symbol
|    symbol:   variable MAZ_VALUE
|  Integer.MAZ_VALUE
|  ^---------------^

jshell> Integer.MAx_VALUE
|  Error:
|  cannot find symbol
|    symbol:   variable MAx_VALUE
|  Integer.MAx_VALUE
|  ^---------------^

jshell> Integer.MAX_VALUE
$17 ==> 2147483647

jshell> Integer.MIN_VALUE
$18 ==> -2147483648

jshell> Integer z = 4;
z ==> 4

jshell> z.getClass()
$20 ==> class java.lang.Integer

jshell> //autoboxing: tacit call to new

jshell> int m = z;
m ==> 4

jshell> m.getClass(0
   ...> )
|  Error:
|  int cannot be dereferenced
|  m.getClass(0
|  ^--------^

jshell> m.getClass()
|  Error:
|  int cannot be dereferenced
|  m.getClass()
|  ^--------^

jshell> //autounboxing

jshell> int left = 6
left ==> 6

jshell> Integer droit = 6;
droit ==> 6

jshell> Integer gauche = 6;
gauche ==> 6

jshell> droit == gauche
$25 ==> true

jshell> droit.equals(gauche)
$26 ==> true

jshell>