如何实现字符串反转

package java程序员面试笔试宝典;

public class 题8_6_1实现字符串反转 {
	public static void main(String[] args) {
		String str="you are a man who are stupid";
		reverseAll(str);
	}
	public static void reverseAll(String str){
		char[] chs=str.toCharArray();
		reverse(chs, 0, chs.length-1);
		int count=0;
		int begin=0;
		int end=0;
		while(count