public class Solution {
public static String toLowerCase(String str) {
char[] A={'A','B','C','D','E','F','G','H','I','J','K','L','M','N','O','P','Q','R','S','T','U','V','W','X','Y','Z'};
char[] a={'a','b','c','d','e','f','g','h','i','j','k','l','m','n','o','p','q','r','s','t','u','v','w','x','Y','z'};
char[] s=str.toCharArray();
StringBuffer str1=new StringBuffer();
for(int i=0;
i
【【练习题】把字符串中大写转成小写】
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