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java-coding-problems/src/ReverseString.java at main · jfullstackdev/java-coding-problems · GitHub
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ReverseString.java
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main
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java-coding-problems
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src
/
ReverseString.java
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public
class
ReverseString
{
public
static
void
main
(
String
[]
args
) {
String
str
=
"789"
;
System
.
out
.
println
(
reverseString
(
str
));
}
public
static
String
reverseString
(
String
in
) {
if
(
in
==
null
)
throw
new
IllegalArgumentException
(
"input null"
);
StringBuilder
out
=
new
StringBuilder
();
char
[]
chars
=
in
.
toCharArray
();
for
(
int
i
=
chars
.
length
-
1
;
i
>=
0
;
i
--)
out
.
append
(
chars
[
i
]);
return
out
.
toString
();
}
}
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