写一个BreakCaesarCipher程序

所以我有一个编程问题。 我希望能够创建一个执行以下操作的breakCaesarCipher类：

1）拆分加密的消息

2）确定两个解密密钥

3）使用这些键创建CaesarCipherTwo的实例。

4）调用解密方法。

我不知道从哪里开始。 我很困惑如何分割加密的消息。 在上一课中，我们这样做了：

import edu.duke.*; public class CaesarBreaker2 { public int[] countOccurrencesOfLetters(String message) { //snippet from lecture String alph = "abcdefghijklmnopqrstuvwxyz"; int[] counts = new int[26]; for (int k=0; k < message.length(); k++) { char ch = Character.toLowerCase(message.charAt(k)); int dex = alph.indexOf(ch); if (dex != -1) { counts[dex] += 1; } } return counts; } public int maxIndex(int[] values) { int maxDex = 0; for (int k=0; k  values[maxDex]) { maxDex = k; } } return maxDex; } public String decrypt(String encrypted) { CaesarCipher cc = new CaesarCipher(); int[] freqs = countOccurrencesOfLetters(encrypted); int maxDex = maxIndex(freqs); int dkey = maxDex - 4; if (maxDex < 4) { dkey = 26 - (4-maxDex); } return cc.encrypt(encrypted,26-dkey); } public String halfOfString(String message, int start) { StringBuilder halfString = new StringBuilder(); for (int index=start;index < message.length();index += 2) { halfString.append(message.charAt(index)); } return halfString.toString(); } public int getKey(String s) { int[] letterFreqs = countOccurrencesOfLetters(s); int maxDex = maxIndex(letterFreqs); int dkey = maxDex - 4; if (maxDex < 4) { dkey = 26 - (4-maxDex); } return 26-dkey; } public String decryptTwoKeys(String encrypted) { String firstHalfEncrypted = halfOfString(encrypted,0); String secondHalfEncrypted = halfOfString(encrypted,1); int firstHalfKey = getKey(firstHalfEncrypted); int secondHalfKey = getKey(secondHalfEncrypted); CaesarCipherTwo ccT = new CaesarCipherTwo(); System.out.println("First key:\t" + firstHalfKey + "\nSecond key:\t" + secondHalfKey); return ccT.encryptTwoKeys(encrypted,firstHalfKey,secondHalfKey); } public void testDecrypt() { FileResource fileResource = new FileResource(); String encrypted = fileResource.asString(); System.out.println("Encrypted message:\n" + encrypted); System.out.println("\nDecrypted message:\n" + decryptTwoKeys(encrypted)); String encrypted2 = "Aal uttx hm aal Qtct Fhljha pl Wbdl. Pvxvxlx!"; System.out.println("Encrypted message:\n" + encrypted2); System.out.println("\nDecrypted message:\n" + decryptTwoKeys(encrypted2)); } } 

但我不明白如何转换此代码，因此它将在这个名为TestCaesarCipherTwo的新类中工作。 以下是TestCaesarCipherTwo的代码：

 import edu.duke.*; public class TestCaesarCipherTwo { public int[] countOccurrencesOfLetters(String message) { //snippet from lecture String alph = "abcdefghijklmnopqrstuvwxyz"; int[] counts = new int[26]; for (int k=0; k < message.length(); k++) { char ch = Character.toLowerCase(message.charAt(k)); int dex = alph.indexOf(ch); if (dex != -1) { counts[dex] += 1; } } return counts; } public int maxIndex(int[] values) { int maxDex = 0; for (int k=0; k  values[maxDex]) { maxDex = k; } } return maxDex; } public String halfOfString(String message, int start) { StringBuilder halfString = new StringBuilder(); for (int index=start;index < message.length();index += 2) { halfString.append(message.charAt(index)); } return halfString.toString(); } public void simpleTests() { FileResource fileResource = new FileResource(); String fileAsString = fileResource.asString(); CaesarCipherTwoKeys cctk = new CaesarCipherTwoKeys(17, 3); String encrypted = cctk.encrypt(fileAsString); System.out.println("Encrypted string:\n"+encrypted); String decrypted = cctk.decrypt(encrypted); System.out.println("Decrypted string:\n"+decrypted); String blindDecrypted = breakCaesarCipher(encrypted); System.out.println("Decrypted string using breakCaesarCipher():\n"+blindDecrypted); } public String breakCaesarCipher(String input) { int[] freqs = countOccurrencesOfLetters(input); int freqDex = maxIndex(freqs); int dkey = freqDex - 4; if (freqDex < 4) { dkey = 26 - (4-freqDex); } CaesarCipherTwoKeys cctk = new CaesarCipherTwoKeys(dkey); return cctk.decrypt(input); } } 

警告：我在这一行上也有一个构造函数错误CaesarCipherTwoKeys cctk = new CaesarCipherTwoKeys（dkey）; 在类CaesarCipherTwoKeys中声明CaesarCipherTwoKeys不能应用于给定类型; required int，int; 找到了……

任何人都可以告诉我如何更改我的代码，以便我的breakCaesarCipher方法拆分加密的消息，确定用于加密消息的两个解密密钥，用这两个密钥创建CaesarCipherTwo实例，并调用解密方法？ 欢迎任何建议。 如果您想了解更多有关此问题性质的详细信息，请与我们联系。