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MAC:Thu Mar 24:10:53:~> jshell
|  Welcome to JShell -- Version 17.0.1
|  For an introduction type: /help intro

jshell> String.format("%s is chasing %s\n", "The cat", "the mouse.")
$1 ==> "The cat is chasing the mouse.\n"

jshell> System.out.println($1)
The cat is chasing the mouse.


jshell> //

jshell> String s = "hellohello";
s ==> "hellohello"

jshell> s.indexOf("l")
$4 ==> 2

jshell> s.indexOf("o", 5)
$5 ==> 9

jshell> s.lastIndexOf("o");
$6 ==> 9

jshell> s.lastIndexOf("o", 8)
$7 ==> 4

jshell> s.indexOf("llo")
$8 ==> 2

jshell> s.indexOf('l');
$9 ==> 2

jshell> s.indexOf('z');
$10 ==> -1

jshell> //obi above

jshell> ////ana

jshell> String s="abc"
s ==> "abc"

jshell> s.replace("a", "b")
$12 ==> "bbc"

jshell> s.replace('a', 'b')
$13 ==> "bbc"

jshell> s.replace('a', "b")
|  Error:
|  no suitable method found for replace(char,java.lang.String)
|      method java.lang.String.replace(char,char) is not applicable
|        (argument mismatch; java.lang.String cannot be converted to char)
|      method java.lang.String.replace(java.lang.CharSequence,java.lang.CharSequence) is not applicable
|        (argument mismatch; char cannot be converted to java.lang.CharSequence)
|  s.replace('a', "b")
|  ^-------^

jshell> s
s ==> "abc"

jshell> s.contains("a")
$15 ==> true

jshell> s.contains("bc")
$16 ==> true

jshell> s.contains("cow")
$17 ==> false

jshell> // Evan

jshell> s
s ==> "abc"

jshell> s.toUpperCase();
$19 ==> "ABC"

jshell> s = s.toUpperCase();
s ==> "ABC"

jshell> s.toLowerCase();
$21 ==> "abc"

jshell> String s = new String("  hmmmmmm   ")
s ==> "  hmmmmmm   "

jshell> s.strip()
$23 ==> "hmmmmmm"

jshell> s.stripLeading()
$24 ==> "hmmmmmm   "

jshell> s.stripTrailing()
$25 ==> "  hmmmmmm"

jshell> s
s ==> "  hmmmmmm   "

jshell> s = "  \n  "
s ==> "  \n  "

jshell> s.isBlank()
$28 ==> true

jshell> "".isBlank()
$29 ==> true

jshell> String.format("%sppy birth%s!!", "Ha", "day")
$30 ==> "Happy birthday!!"

jshell> String.format("%sppy birth%s!!", "Ha", 42)
$31 ==> "Happy birth42!!"

jshell> String.format("H%sppy birth%s!!", "a", 42)
$32 ==> "Happy birth42!!"

jshell> String.format("%s%s", "goof")
|  Exception java.util.MissingFormatArgumentException: Format specifier '%s'
|        at Formatter.format (Formatter.java:2688)
|        at Formatter.format (Formatter.java:2625)
|        at String.format (String.java:4140)
|        at (#33:1)

jshell> String.format("%s%s", "goof", "ball)
|  Error:
|  unclosed string literal
|  String.format("%s%s", "goof", "ball)
|                                ^

jshell> String.format("%s%s", "goof", "ball")
$34 ==> "goofball"

jshell>