Commit d29f62d

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Create ReverseString.java

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	`1`	`+public class ReverseString {`
	`2`	`+`
	`3`	`+ public static void main(String[] args) {`
	`4`	`+`
	`5`	`+ String str = "789";`
	`6`	`+ System.out.println(reverseString(str));`
	`7`	`+ }`
	`8`	`+`
	`9`	`+ public static String reverseString(String in) {`
	`10`	`+ if (in == null)`
	`11`	`+ throw new IllegalArgumentException("input null");`
	`12`	`+`
	`13`	`+ StringBuilder out = new StringBuilder();`
	`14`	`+`
	`15`	`+ char[] chars = in.toCharArray();`
	`16`	`+`
	`17`	`+ for (int i = chars.length - 1; i >= 0; i--)`
	`18`	`+ out.append(chars[i]);`
	`19`	`+`
	`20`	`+ return out.toString();`
	`21`	`+ }`
	`22`	`+}`

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