标签：aes buffer rgs int new continue cipher logs .com
1.程序设计思想：
程序首先需要获取要加密的或者待解密字符串，然后通过算法进行字符错位，关键也是字符的错位，最后直接调用函数输出字符串。
2.程序流程图：
3.源程序：
import java.util.Scanner;
public class Caesarcipher {
public static void main(String[] args) {
System.out.print("请选择操作（1.加密、2.解密）：");
Scanner sc = new Scanner(System.in);
int index = sc.nextInt();
if (1 == index) {
System.out.print("请输入字符串：");
String str = sc.next();
StringBuffer newStr = new StringBuffer();
for (int i = 0; i < str.length(); i++)
{
char c = str.charAt(i);
switch (c)
{
case ‘x‘:
newStr.append(‘a‘);
break;
case ‘y‘:
newStr.append(‘b‘);
break;
case ‘z‘:
newStr.append(‘c‘);
break;
default:
if (!(c >= ‘a‘ && c <= ‘w‘)) {
newStr.append(c);
continue;
}
char newChar = (char) (c + 3);
newStr.append(newChar);
}
}
System.out.println("加密后的字符串是：" + newStr.toString());
} else if (2 == index) {
System.out.print("请输入字符串：");
String str = sc.next();
char[] arr = str.toCharArray();
for (int i = 0; i < arr.length; i++) {
switch (arr[i]) {
case ‘a‘:
arr[i] = ‘x‘;
break;
case ‘b‘:
arr[i] = ‘y‘;
break;
case ‘c‘:
arr[i] = ‘z‘;
break;
default:
if (!(arr[i] >= ‘d‘ && arr[i] <= ‘z‘)) {
continue;
}
arr[i] -= 3;
}
}
System.out.print("解密后的字符串是：");
for (int i = 0; i < arr.length; i++) {
System.out.print(arr[i]);
}
} else {
System.out.println("输入错误,请输入1或2");
}
sc.close();
}
}
4.程序结果截图;
标签：aes buffer rgs int new continue cipher logs .com
原文地址：http://www.cnblogs.com/cj-125/p/7744109.html
