Java大小写转化

• java大写转小写

public String toLowerCase(String str){
        char[] chars = str.toCharArray();
        for (int i = 0; i < chars.length; i++) {
            if ('A' <= chars[i] && chars[i]<= 'Z'){
                chars[i] += 32;
            }
        }
        return String.valueOf(chars);
    }public String toLowerCase(St