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Cipher.java
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45 lines (39 loc) · 1.18 KB
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public class Cipher {
public static void main(String[] args) {
String str = "";
String enc = encrypt(str);
System.out.println(str + " " + enc + " " + decrypt(enc));
}
public static String encrypt(String text) {
String result = "";
for (int i = 0; i < text.length(); i++) {
char c = text.charAt(i);
if (c >= 'a' && c <= 'z') {
if (c == 'z') c = 'a';
else c = (char) (c + 1);
}
else if (c >= 'A' && c <= 'Z') {
if (c == 'Z') c = 'A';
else c = (char) (c + 1);
}
result += c;
}
return result;
}
public static String decrypt(String text) {
String result = "";
for (int i = 0; i < text.length(); i++) {
char c = text.charAt(i);
if (c >= 'a' && c <= 'z') {
if (c == 'a') c = 'z';
else c = (char) (c - 1);
}
else if (c >= 'A' && c <= 'Z') {
if (c == 'A') c = 'Z';
else c = (char) (c - 1);
}
result += c;
}
return result;
}
}