蓝桥杯 算法训练 大小写转换 JAVA

import java.io.BufferedReader;import java.io.IOException;import java.io.InputStreamReader;class Main{public static void main(String[] args) throws IOException {BufferedReader br = new BufferedReader(new InputStreamReader(System.in) );char c[]  = br.readLine().toCharArray();for (int i = 0; i < c.length; i++) {if(c[i]>=65 && c[i]<=90){c[i]+=32;}else{c[i]-=32;}}System.out.println(new String(c));}}