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Create reverseString.java #925

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Create reverseString.java #925

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23 changes: 23 additions & 0 deletions reverseString.java
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Original file line number Diff line number Diff line change
@@ -0,0 +1,23 @@
public class reverseString {

public static void main(String[] args) {
String str = "123";

System.out.println(reverse(str));
}

public static String reverse(String in) {
if (in == null)
throw new IllegalArgumentException("Null is not valid input");

StringBuilder out = new StringBuilder();

char[] chars = in.toCharArray();

for (int i = chars.length - 1; i >= 0; i--)
out.append(chars[i]);

return out.toString();
}

}