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MAC:Thu Apr 07:12:44:~> jshell
|  Welcome to JShell -- Version 17.0.1
|  For an introduction type: /help intro

jshell> Integer i = 5;
i ==> 5

jshell> Double d = 4.5;
d ==> 4.5

jshell> i.getClass()
$3 ==> class java.lang.Integer

jshell> d.getClass()
$4 ==> class java.lang.Double

jshell> int k = 5;
k ==> 5

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

jshell> i = new Integer(5);
|  Warning:
|  Integer(int) in java.lang.Integer has been deprecated and marked for removal
|  i = new Integer(5);
|      ^------------^
i ==> 5

jshell> Integer f = 42;
f ==> 42

jshell> f.getClass()
$8 ==> class java.lang.Integer

jshell> int y = f;
y ==> 42

jshell> Integer.BYTES
$10 ==> 4

jshell> Integer.SIZE
$11 ==> 32

jshell> Double.BYTES
$12 ==> 8

jshell> Double.SIZE
$13 ==> 64

jshell> Integer.MAX_VALUE
$14 ==> 2147483647

jshell> Integer.MIN_VALUE
$15 ==> -2147483648

jshell> Short.MAX_VALUE
$16 ==> 32767

jshell> String s= "4333";
s ==> "4333"

jshell> int n = Integer.parseInt(s);
n ==> 4333

jshell> Integer.parseInt("cow")
|  Exception java.lang.NumberFormatException: For input string: "cow"
|        at NumberFormatException.forInputString (NumberFormatException.java:67)
|        at Integer.parseInt (Integer.java:668)
|        at Integer.parseInt (Integer.java:786)
|        at (#19:1)

jshell> ArrayList<int> nums = ArrayList<>();
|  Error:
|  illegal start of expression
|  ArrayList<int> nums = ArrayList<>();
|                                  ^
|  Error:
|  -> expected
|  ArrayList<int> nums = ArrayList<>();
|                                     ^

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

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

jshell> nums.add(42);
$21 ==> true

jshell> nums.add(33);
$22 ==> true

jshell> nums.add(21);
$23 ==> true

jshell> nums.add(122);
$24 ==> true

jshell> nums
nums ==> [42, 33, 21, 122]

jshell> TreeSet<Integer> ts = new TreeSet<>();
ts ==> []

jshell> ts.add(4)
$27 ==> true

jshell> ts.add(4)
$28 ==> false

jshell> ts
ts ==> [4]

jshell> ts.add(5)
$30 ==> true

jshell> ts.add(6)
$31 ==> true

jshell> ts
ts ==> [4, 5, 6]

jshell> ts.add(-1)
$33 ==> true

jshell> ts
ts ==> [-1, 4, 5, 6]

jshell> HashSet<String> hs = new HashSet<>();
hs ==> []

jshell> hs.add("hello");
$36 ==> true

jshell> hs.add("goodbye");
$37 ==> true

jshell> hs.add("zygote")
$38 ==> true

jshell> hs
hs ==> [zygote, goodbye, hello]

jshell> Double.parseDouble("4.55654");
$40 ==> 4.55654

jshell> ///  Type.parseType(string) -> type

jshell> Boolean.parseBoolean("false")
$41 ==> false

jshell> Long.parseLong("234532535")
$42 ==> 234532535

jshell> Byte.parseByte("12")
$43 ==> 12

jshell> Integer.parseInt("1111101111", 2)
$44 ==> 1007

jshell> Integer.parseInt("1111101112", 2)
|  Exception java.lang.NumberFormatException: For input string: "1111101112" under radix 2
|        at NumberFormatException.forInputString (NumberFormatException.java:67)
|        at Integer.parseInt (Integer.java:668)
|        at (#45:1)

jshell> Integer.parseInt("syzygy", 36)
$46 ==> 1751837506

jshell> Integer.parseInt("syzygy", 37)
|  Exception java.lang.NumberFormatException: radix 37 greater than Character.MAX_RADIX
|        at Integer.parseInt (Integer.java:639)
|        at (#47:1)

jshell> Integer.parseInt("abcdef", 16)
$48 ==> 11259375

jshell> 0xFF
$49 ==> 255

jshell> 0b10111101
$50 ==> 189

jshell> 0o55
|  Error:
|  ';' expected
|  0o55
|   ^

jshell> 055
$51 ==> 45

jshell> 09
|  Error:
|  ';' expected
|  09
|   ^

jshell> 099999
|  Error:
|  ';' expected
|  099999
|   ^

jshell> 099999;
|  Error:
|  ';' expected
|  099999;
|   ^

jshell> Integer.signum(40)
$52 ==> 1

jshell> Integer.signum(2)
$53 ==> 1

jshell> Integer.signum(3)
$54 ==> 1

jshell> Integer.signum(0)
$55 ==> 0

jshell> Integer.signum(9)
$56 ==> 1

jshell> Integer.signum(-9)
$57 ==> -1

jshell> Integer.signum(-1)
$58 ==> -1

jshell> Integer.signum(11)
$59 ==> 1

jshell> Integer.toString(23442)
$60 ==> "23442"

jshell> "" + 23442
$61 ==> "23442"

jshell> Integer.toString(100, 16)
$62 ==> "64"

jshell> Integer.toString(101, 16)
$63 ==> "65"

jshell> Integer.toString(110, 16)
$64 ==> "6e"

jshell> Integer.toString(111, 16)
$65 ==> "6f"

jshell> Integer.toString(112, 16)
$66 ==> "70"

jshell> double d = 1.0/0
d ==> Infinity

jshell> Double.isFinite(d)
$68 ==> false

jshell> Double.isNaN(d)
$69 ==> false

jshell> Character.BYTES
$70 ==> 2

jshell> Character.isAlphabetic('
|  Error:
|  unclosed character literal
|  Character.isAlphabetic('
|                         ^

jshell> Character.isAlphabetic('a')
$71 ==> true

jshell> Character.isAlphabetic('@')
$72 ==> false

jshell> Character.isDigit('3')
$73 ==> true

jshell> Character.isDigit('a')
$74 ==> false

jshell> Character.isDigit('9')
$75 ==> true

jshell> Character.isISOControl('\n')
$76 ==> true

jshell> Character.isISOControl('a')
$77 ==> false

jshell> Character.isISOControl('\r')
$78 ==> true

jshell> Character.isWhitespace(' ')
$79 ==> true

jshell> Character  ch = 'a';
ch ==> 'a'

jshell> char dh = ch;
dh ==> 'a'

jshell> "cat".compareToIgnoreCase("n") < 0