JAVA 输入一个字符串，将大写字母改成小写,小写字母改成大写

参考链接： Java程序比较字符串

JAVA 输入一个字符串，将大写字母改成小写,小写字母改成大写 

public class Homework3 { public static void main(String[] args) { Scanner sc = new Scanner(System.in); System.out.println(“请输入字符串：”); String character = sc.nextLine(); char[] arr=character.toCharArray(); for (int i = 0; i < arr.length; i++) { if ((int)arr[i] >= 65 && (int)arr[i] <= 90) { arr[i] += 32; } else if ((int)arr[i] >= 97 && (int)arr[i] <= 122) { arr[i] -= 32; } } for (int i = 0; i < arr.length; i++) { System.out.print(arr[i]+" "); } } }