心路历程：正常逻辑思考
已知： 一.单选 二.9题为入口 三.两个条件： 1.1题与6题答案相同为真，X题与5题答案相同为假 2.1题与6题答案相同为假，X题与5题答案相同为真
四.2题不与任何一题答案相同
解：
令1题与6题答案相同为真，则1，6，8题答案B
8题答案B，5题与1题答案不相邻，1题答案B，所以5，7题D
答案字母出现次数最少，既出现次数为1，若为2，则其他选项出现次数为333，+2=11>10，所以假设失败
正确条件是X题与5题答案相同为真
X题与5题答案相同，由9题知2，6，9，10题中只有一题与5题答案相同，由5题知4，7，8，9题中只有一题与5题答案相同，9题不与5题答案相同，所以6题C
由上述已知得6题不与5题相同，且3,10,8答案相同，所以9题B，则3,8,10,5题答案相同
得出3,8,10,5题A，所以2题C
又因为7题答案不是C，由8题知7题与1题答案不相邻，去4题排除BDA，所以4题C，1题B
因为8题答案是A，所以7题D
代码这么写的： package com.yunzhi.edu.controller; import java.util.ArrayList; import java.util.Arrays; import java.util.Collections; import java.util.List; public class Test { //list是答案集合，对应下面每一道题得答案，有一个不满足就返回false，都满足返回true public static boolean bln(List<String> list) { if (!T1(list)) { return false; } if (!T2(list)) { return false; } if (!T3(list)) { return false; } if (!T4(list)) { return false; } if (!T5(list)) { return false; } if (!T6(list)) { return false; } if (!T7(list)) { return false; } if (!T8(list)) { return false; } if (!T9(list)) { return false; } if (!T10(list)) { return false; } return true; } //1T：这道题选啥？（A A，B B，C C，D D）。第一题写不写对程序没啥影响，根本没影响 public static boolean T1(List<String> list) { String str = list.get(0); if (str.equals("A")) { boolean flag = (str.equals("A")); return flag; } if (str.equals("B")) { boolean flag = (str.equals("B")); return flag; } if (str.equals("C")) { boolean flag = (str.equals("C")); return flag; } if (str.equals("D")) { boolean flag = (str.equals("D")); return flag; } return false; } //2T：第5题选啥？（A C，B D，C A，D B）。写不写这道题还是没啥影响 public static boolean T2(List<String> list) { String str = list.get(1); if (str.equals("A")) { //5T答案C String a = list.get(4); boolean flag = (a.equals("C")); return flag; } if (str.equals("B")) { //5T答案D String a = list.get(4); boolean flag = (a.equals("D")); return flag; } if (str.equals("C")) { //5T答案A String a = list.get(4); boolean flag = (a.equals("A")); return flag; } if (str.equals("D")) { //5T答案B String a = list.get(4); boolean flag = (a.equals("B")); return flag; } return false; } //3T：以下选项中哪一个与其他三个不同？（A 3，B 6，C 2，D 4）。既三个一样的，一个不一样的 public static boolean T3(List<String> list) { String str = list.get(2); if (str.equals("A")) { //2T4T6T答案相同 String a = list.get(1); String b = list.get(3); String c = list.get(5); boolean flag = (a.equals(b) && a.equals(c) && b.equals(c)); return flag; } if (str.equals("B")) { //2T3T4T答案相同 String a = list.get(1); String b = list.get(2); String c = list.get(3); boolean flag = (a.equals(b) && a.equals(c) && b.equals(c)); return flag; } if (str.equals("C")) { //3T4T6T答案相同 String a = list.get(2); String b = list.get(3); String c = list.get(5); boolean flag = (a.equals(b) && a.equals(c) && b.equals(c)); return flag; } if (str.equals("D")) { //2T3T6T答案相同 String a = list.get(1); String b = list.get(2); String c = list.get(5); boolean flag = (a.equals(b) && a.equals(c) && b.equals(c)); return flag; } return false; } //4T：以下选项中哪两题答案相同？（A 1T5T，B 2T7T，C 1T9T, D 6T10T）。既选项中两道题答案相同 public static boolean T4(List<String> list) { String str = list.get(3); if (str.equals("A")) { //1T5T答案相同 String a = list.get(0); String b = list.get(4); boolean flag = a.equals(b); return flag; } if (str.equals("B")) { //2T7T答案相同 String a = list.get(1); String b = list.get(6); boolean flag = a.equals(b); return flag; } if (str.equals("C")) { //1T9T答案相同 String a = list.get(0); String b = list.get(8); boolean flag = a.equals(b); return flag; } if (str.equals("D")) { //6T10T答案相同 String a = list.get(5); String b = list.get(9); boolean flag = a.equals(b); return flag; } return false; } //5T：以下哪个与本题答案相同？（A 8, B 4, C 9, D 7）。既选项与5T答案相同 public static boolean T5(List<String> list) { String str = list.get(4); if (str.equals("A")) { //5T8T答案相同 String a = list.get(4); String b = list.get(7); boolean flag = a.equals(b); return flag; } if (str.equals("B")) { //5T4T答案相同 String a = list.get(3); String b = list.get(4); boolean flag = a.equals(b); return flag; } if (str.equals("C")) { //5T9T答案相同 String a = list.get(4); String b = list.get(8); boolean flag = a.equals(b); return flag; } if (str.equals("D")) { //5T7T答案相同 String a = list.get(4); String b = list.get(6); boolean flag = a.equals(b); return flag; } return false; } //6T：以下哪两个与8T答案相同？（A 2T4T， B 1T6T， C 3T10T， D 5T9T）。既选项和8T三个选项一样 public static boolean T6(List<String> list) { String str = list.get(5); if (str.equals("A")) { //2T4T8T答案相同 String a = list.get(1); String b = list.get(3); String c = list.get(7); boolean flag = (a.equals(b) && a.equals(c) && b.equals(c)); return flag; } if (str.equals("B")) { //1T6T8T答案相同 String a = list.get(0); String b = list.get(5); String c = list.get(7); boolean flag = (a.equals(b) && a.equals(c) && b.equals(c)); return flag; } if (str.equals("C")) { //3T8T10T答案相同 String a = list.get(2); String b = list.get(7); String c = list.get(9); boolean flag = (a.equals(b) && a.equals(c) && b.equals(c)); return flag; } if (str.equals("D")) { //5T8T9T答案相同 String a = list.get(4); String b = list.get(7); String c = list.get(8); boolean flag = (a.equals(b) && a.equals(c) && b.equals(c)); return flag; } return false; } //7T：10道题中最少的选项是什么？（A C, B B, C A, D D）。Collections.frequency(list, String)方法计算list中出现重复的次数 public static boolean T7(List<String> list) { String str = list.get(6); int countA = Collections.frequency(list, "A"); int countB = Collections.frequency(list, "B"); int countC = Collections.frequency(list, "C"); int countD = Collections.frequency(list, "D"); List<Integer> arrayList = new ArrayList<Integer>(); arrayList.add(countA); arrayList.add(countB); arrayList.add(countC); arrayList.add(countD); int a = Collections.min(arrayList); if (str.equals("A")) { boolean flag = (a == countC); return flag; } if (str.equals("B")) { boolean flag = (a == countB); return flag; } if (str.equals("C")) { boolean flag = (a == countA); return flag; } if (str.equals("D")) { boolean flag = (a == countD); return flag; } return false; } //8T：以下哪个与1T答案不相邻？（A 7， B 5， C 2， D 10）。既AC与BD与AD（Math.abs（）取绝对值，indexOf是取下表索引） public static boolean T8(List<String> list) { String[] numArray = new String[]{"A", "B", "C", "D"}; List<String> arrayList = Arrays.asList(numArray); String str = list.get(7); String STR = list.get(0); //两道题答案索引之差绝对值大于1 if (str.equals("A")) { String asd = list.get(6); boolean flag = (Math.abs(arrayList.indexOf(STR) - arrayList.indexOf(asd)) > 1); return flag; } if (str.equals("B")) { String asd = list.get(4); boolean flag = (Math.abs(arrayList.indexOf(STR) - arrayList.indexOf(asd)) > 1); return flag; } if (str.equals("C")) { String asd = list.get(1); boolean flag = (Math.abs(arrayList.indexOf(STR) - arrayList.indexOf(asd)) > 1); return flag; } if (str.equals("D")) { String asd = list.get(9); boolean flag = (Math.abs(arrayList.indexOf(STR) - arrayList.indexOf(asd)) > 1); return flag; } return false; } //9T：“1T6T答案相同”与“XT5T答案相同”真假性相反，X=？（A 6， B 10， C 2， D 9）。既 1T=6T&&XT!=5T 或 1T!=6T&&XT=5T public static boolean T9(List<String> list) { String str = list.get(8); String asd = list.get(0); String ASD = list.get(5); boolean flag = asd.equals(ASD); //flag为真，XT与5T没关系；flag为假，XT=5T if (str.equals("A")) { if (!flag) { String a = list.get(4); String b = list.get(5); boolean ToF = a.equals(b); return ToF; } } if (str.equals("B")) { if (!flag) { String a = list.get(4); String b = list.get(9); boolean ToF = a.equals(b); return ToF; } } if (str.equals("C")) { if (!flag) { String a = list.get(1); String b = list.get(4); boolean ToF = a.equals(b); return ToF; } } if (str.equals("D")) { if (!flag) { String a = list.get(4); String b = list.get(8); boolean ToF = a.equals(b); return ToF; } } return false; } //10T：答案中ABCD出现次数最多与最少之差？（A 3， B 2， C 4， D 1）。 public static boolean T10(List<String> list) { String str = list.get(9); int countA = Collections.frequency(list, "A"); int countB = Collections.frequency(list, "B"); int countC = Collections.frequency(list, "C"); int countD = Collections.frequency(list, "D"); List<Integer> arrayList = new ArrayList<Integer>(); arrayList.add(countA); arrayList.add(countB); arrayList.add(countC); arrayList.add(countD); int a = Collections.min(arrayList); int b = Collections.max(arrayList); if (str.equals("A")) { boolean flag = (b - a == 3); return flag; } if (str.equals("B")) { boolean flag = (b - a == 2); return flag; } if (str.equals("C")) { boolean flag = (b - a == 4); return flag; } if (str.equals("D")) { boolean flag = (b - a == 1); return flag; } return false; } public static void main(String[] args) { //ABCD String[] numArray = new String[]{"A", "B", "C", "D"}; //一个特特特特特特别特别大的循环 String[] initArray = new String[10]; List<String> selectList = Arrays.asList(initArray); for (String q : numArray) { selectList.set(0, q); for (String w : numArray) { selectList.set(1, w); for (String e : numArray) { selectList.set(2, e); for (String a : numArray) { selectList.set(3, a); for (String s : numArray) { selectList.set(4, s); for (String d : numArray) { selectList.set(5, d); for (String z : numArray) { selectList.set(6, z); for (String x : numArray) { selectList.set(7, x); for (String c : numArray) { selectList.set(8, c); for (String v : numArray) { selectList.set(9, v); boolean result = bln(selectList); if (result == true) { System.out.println("2018刑侦科测试题答案为:" + selectList.toString()); } } } } } } } } } } } } } 答案：B, C, A, C, A, C, D, A, B, A