ROT-13在java中的功能？
ROT-13在java中的功能？
提问于 2019-03-25 23:39:35
有没有已经是rot13()和unrot13()实现为标准Java库的一个组成部分？或者我是否必须自己编写并“重新发明wheel”？
它可能看起来像这样：
int rot13 ( int c ) {
if ( (c >= 'A') && (c <= 'Z') )
c=(((c-'A')+13)%26)+'A';
if ( (c >= 'a') && (c <= 'z') )
c=(((c-'a')+13)%26)+'a';
return c;
}
回答 2
Stack Overflow用户
发布于 2019-03-26 07:54:14
我不认为它默认是Java的一部分，但这里有一个如何实现它的例子;
public class Rot13 {
public static void main(String[] args) {
String s = args[0];
for (int i = 0; i < s.length(); i++) {
char c = s.charAt(i);
if (c >= 'a' && c <= 'm') c += 13;
else if (c >= 'A' && c <= 'M') c += 13;
else if (c >= 'n' && c <= 'z') c -= 13;
else if (c >= 'N' && c <= 'Z') c -= 13;
System.out.print(c);
}
System.out.println();
}
}
资料来源：http：//introcs.cs.princeton.edu/java/31datatype/Rot13.java.html
Stack Overflow用户
发布于 2019-03-26 09:28:31
这是我在字符串中转换字符的解决方案。
public static void main(String[] args) {
String input = "melike";
int shiftCount = 13;
char[] encryptedChars = encryptedChars(shiftCount);
System.out.println(new String(encryptedChars));
char[] decryptedChars = decryptedChars(shiftCount);
System.out.println(new String(decryptedChars));
String encrypted = encrypt(input, shiftCount);
System.out.println(encrypted);
String decrypted = decrypt(encrypted, shiftCount);
System.out.println(decrypted);
System.out.println(input.equals(decrypted));
}
private static String decrypt(String input, int shiftCount) {
char[] decryptedChars = decryptedChars(shiftCount);
char[] chars = input.toCharArray();
char[] newChars = new char[chars.length];
for (int i = 0; i < chars.length; i++) {
int diff = chars[i] - 'a';
newChars[i] = decryptedChars[diff];
}
return new String(newChars);
}
private static String encrypt(String input, int shiftCount) {
char[] encryptedChars = encryptedChars(shiftCount);
char[] chars = input.toCharArray();
char[] newChars = new char[chars.length];
for (int i = 0; i < chars.length; i++) {
int diff = chars[i] - 'a';
newChars[i] = encryptedChars[diff];
}
return new String(newChars);
}
private static char[] encryptedChars(int shiftCount) {
char[] newChars = new char[26];
for (int i = 0; i < 26; i++) {
newChars[i] = (char) ('a' + (i + shiftCount) % 26);
}
return newChars;
}
private static char[] decryptedChars(int shiftCount) {
char[] newChars = new char[26];
for (int i = 0; i < 26; i++) {
newChars[i] = (char) ('a' + (i - shiftCount + 26) % 26);
}
return newChars;
}
页面原文内容由Stack Overflow提供。腾讯云小微IT领域专用引擎提供翻译支持
原文链接：
https://stackoverflow.com/questions/-100006504
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