(java) 编写一个程序,实现字符串大小写的转换并倒序输出,要求如下:

public class Test {
public static void main(String[] args) {
String str = "HelloWorld";
// 字符串转成 char 数组
char[] ch = str.toCharArray();
StringBuffer buffer = new StringBuffer(); for (int i = str.length() - 1; i >= 0; i--) {
if (ch[i] >= 'A' && ch[i] <= 'Z') {
buffer.append(String.valueOf(ch[i]).toLowerCase());
} else if (ch[i] >= 'a' && ch[i] <= 'z') {
buffer.append(String.valueOf(ch[i]).toUpperCase());
} }
System.out.println(buffer.toString());
}
}

 

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