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ROT13Cipher.java
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ROT13Cipher.java
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public class ROT13Cipher {
private final static int countShiftLetter = 13;
public static StringBuilder encryption(StringBuilder plainText)
{
plainText = new StringBuilder(plainText.toString().trim().toLowerCase());
StringBuilder cipherText=new StringBuilder();
for(char letterInTheText:plainText.toString().toCharArray())
{
cipherText.append(ShiftLetter(letterInTheText));
}
return cipherText;
}
public static StringBuilder decryption(StringBuilder cipherText)
{
StringBuilder plainText=new StringBuilder();
for(char letterInTheText:cipherText.toString().toCharArray())
{
plainText.append(ShiftLetter(letterInTheText));
}
return plainText;
}
public static Character ShiftLetter(Character letter)
{
if(!Character.isLetter(letter))
return letter;
int count=0;
while(count<countShiftLetter)
{
if(letter=='z')
letter='a';
else
letter++;
count++;
}
return letter;
}
public static void main(String[] args)
{
StringBuilder plainText = new StringBuilder("software");
System.out.println("Metnin Acik Hali :"+plainText);
StringBuilder cipherText = encryption(plainText);
System.out.println("Metnin Sifrelenmis Hali :"+cipherText);
plainText = decryption(cipherText);
System.out.println("Metnin Acik Hali :"+plainText);
}
}