用Java实现I am a student逆序输出为student a am I,不使用split方法和StringBuffer，只用最原始的数组
总体思路：先整体后局部
public class ReverseString {public static void swap(char[] ch,int a,int b) {char tmp;for(;a < b;a++,b--) {tmp = ch[a];ch[a] = ch[b];ch[b] = tmp;}}public static String reverseStr(String str) {char[] chars = str.toCharArray();//先逆序整个数组tneduts a ma Iswap(chars,0,chars.length-1);//再以空格为界逆序每个单词int start = 0;for(int i = 1;i < chars.length;i++) {if(chars[i] == ' ') {swap(chars,start,i-1);start = i+1;}}return String.valueOf(chars);}public static void main(String[] args) {String str = "I am a student";System.out.println(reverseStr(str));;}}
