题解 | #字符串变形#

import java.util.*;

public class Solution {
    public String trans(String s, int n) {
        StringBuilder result = new StringBuilder();
        StringBuilder temp = new StringBuilder();;
        for(int i = 0;i<n;i++){
            char c = s.charAt(i);
            if(c==' '){
                result.insert(0, temp).insert(0, c);
                temp = new StringBuilder();
            }else if(c>='a'&&c<='z'){
                temp.append(Character.toUpperCase(c));
            }else{
                temp.append(Character.toLowerCase(c));
            }
        }
        return temp.append(result).toString();
    }
}