public class Solution {
public String trans(String s, int n) {
// write code here
StringBuffer sb = new StringBuffer();
StringBuffer sbSub = new StringBuffer();
for(int i = s.length() - 1;i>=0;i--){
//解析到空格则直接保存空格 解析到非空格则继续解析直到下一个空格 然后一起变换
char next = s.charAt(i);
if(next == ' '){
if(sbSub.length() > 0){
sb.append(reserve(sbSub.toString()));
sbSub = new StringBuffer();
}
sb.append(" ");
} else {
sbSub.insert(0,next);
if(i == 0){
sb.append(reserve(sbSub.toString()));
}
}
}
return sb.toString();
}
private String reserve(String target){
StringBuffer sb = new StringBuffer();
for(int i =0;i<target.length();i++){
char next = target.charAt(i);
if(next >= 'a'){
sb.append((char)(next - 32));
} else {
sb.append((char)(next + 32));
}
}
return sb.toString();
}
}