一个用来交作业的东西。。。

//作者-生化，用于密码学基础作业- -

package Algorithms;import java.util.ArrayList;import java.util.List;import java.lang.Math;;public class ShiftCiper {public static void satitisticalAnalysis() {String cipherText = "OVDTHUFWVZZPISLRLFZHYLAOLYLWSLHZLMPUKAOLHUZDLY";List<prob> probList = new ArrayList<prob>();addprob(probList);List<prob> cipherList = new ArrayList<prob>();addprob(cipherList);for(int i=0;i<cipherList.size();i++){cipherList.get(i).setProb(0);}for(int i=0;i<cipherText.length();i++){int loc = (int)(cipherText.charAt(i) - 'A');cipherList.get(loc).addProb();}for(int i=0;i<cipherList.size();i++){cipherList.get(i).setProb(cipherList.get(i).getProb()/cipherText.length());}for(int i=0;i<26;i++){double result = 0;for(int j=0;j<26;j++){result+= probList.get(j).getProb() * cipherList.get((i+j)%26).getProb();}if(Math.abs(result-0.065)<=0.005){System.out.println("当偏移量为" + i + "时，统计量为"+result);String plainText="";for(int m=0;m<cipherText.length();m++){char s= (char)(cipherText.charAt(m)-i);if(s>'Z'){s-=26;}else if(s<'A'){s+=26;}s+='a'-'A';plainText+=s;}System.out.println("原文为:"+plainText);}}}public static void main(String[] args) {satitisticalAnalysis();}    static class prob {String key;double prob;public prob(String key, double prob) {super();this.key = key;this.prob = prob/100;}public void addProb(){prob = prob+1;}public String getKey() {return key;}public void setKey(String key) {this.key = key;}public double getProb() {return prob;}public void setProb(double prob) {this.prob = prob;}}private static void addprob(List<prob> problist) {// TODO Auto-generated method stubprob a = new prob("a", 8.2);prob b = new prob("b", 1.5);prob c = new prob("c", 2.8);prob d = new prob("d", 4.3d);prob e = new prob("e", 12.7);prob f = new prob("f", 2.2d);prob g = new prob("g", 2.0d);prob h = new prob("h", 6.1d);prob i = new prob("i", 7.0d);prob j = new prob("j", 0.2d);prob k = new prob("k", 0.8d);prob l = new prob("l", 4.0d);prob m = new prob("m", 2.4d);prob n = new prob("n", 6.7d);prob o = new prob("o", 1.5d);prob p = new prob("p", 1.9d);prob q = new prob("q", 0.1d);prob r = new prob("r", 6.0d);prob s = new prob("s", 6.3d);prob t = new prob("t", 9.1d);prob u = new prob("u", 2.8d);prob v = new prob("v", 1.0d);prob w = new prob("w", 2.4d);prob x = new prob("x", 0.2d);prob y = new prob("y", 2.0d);prob z = new prob("z", 0.1d);problist.add(a);problist.add(b);problist.add(c);problist.add(d);problist.add(e);problist.add(f);problist.add(g);problist.add(h);problist.add(i);problist.add(j);problist.add(k);problist.add(l);problist.add(m);problist.add(n);problist.add(o);problist.add(p);problist.add(q);problist.add(r);problist.add(s);problist.add(t);problist.add(u);problist.add(v);problist.add(w);problist.add(x);problist.add(y);problist.add(z);}}

作者-生化，用于密码学基础作业- -