(base) MAC:Wed Apr 21:14:00:conditional> jshell
|  Welcome to JShell -- Version 15.0.1
|  For an introduction type: /help intro

jshell> Double d = 1.5;
d ==> 1.5

jshell> d.toString()
$2 ==> "1.5"

jshell> double x = 1.5;
x ==> 1.5

jshell> x.toString()
|  Error:
|  double cannot be dereferenced
|  x.toString()
|  ^--------^

jshell> Double.toString(6.02e23)
$4 ==> "6.02E23"

jshell> String avocado = "6.02e23"
avocado ==> "6.02e23"

jshell> Double.parseDouble(avocado)
$6 ==> 6.02E23

jshell> Double.MAX_VALUE
$7 ==> 1.7976931348623157E308

jshell> Double.MIN_VALUE
$8 ==> 4.9E-324

jshell> Character.isAlphabetic('a')
$9 ==> true

jshell> Character.isAlphabetic('9')
$10 ==> false

jshell> Character.isAlphabetic('\n')
$11 ==> false

jshell> Character.isDigit('9')
$12 ==> true

jshell> Character.isDigit('8')
$13 ==> true

jshell> Character.isDigit('q')
$14 ==> false

jshell> Character.isISOControl('\n')
$15 ==> true

jshell> Character.isISOControl('9')
$16 ==> false

jshell> Character.isWhitespace(' ')
$17 ==> true

jshell> Character.isWhitespace('\n')
$18 ==> true

jshell> Character.isWhitespace('\t')
$19 ==> true

jshell> Character.isWhitespace('q')
$20 ==> false

jshell> Character.toLowerCase('A')
$21 ==> 'a'

jshell> Character.toUpperCase('A')
$22 ==> 'A'

jshell> Character.toUpperCase('r')
$23 ==> 'R'

jshell> Character.toUpperCase('9')
$24 ==> '9'

jshell> Character.swapCase('a')
|  Error:
|  cannot find symbol
|    symbol:   method swapCase(char)
|  Character.swapCase('a')
|  ^----------------^

jshell> Character.toString('a')
$25 ==> "a"

jshell> "" + 'a'
$26 ==> "a"

jshell> Character.compare('a', 'b')
$27 ==> -1

jshell> Character.compare('a', 'c')
$28 ==> -2

jshell> Character.compare('a', '')
|  Error:
|  empty character literal
|  Character.compare('a', '')
|                         ^

jshell> Character.compare('a', 'A')
$29 ==> 32

jshell> Character.compare('a', 'b') < 0
$30 ==> true

jshell> Character.compare('a', 'b') > 0
$31 ==> false

jshell> Character.compare('a', 'b') >= 0
$32 ==> false

jshell> Character.compare('a', 'b')<= 0
$33 ==> true