题目

主类

public static List<Prisoner> prisoners = new ArrayList<Prisoner>();
public static List<Prisoner> remainPrisoners = new ArrayList<Prisoner>();
public static Prisoner lastPrisoner = null;

public static void main(String[] args) {Random random = new Random();// 循环100次 生成100个囚犯for (int i = 0; i < 100; i++) {// 生成随机数Long code = (long) random.nextInt(200) + 1;if (existCode(code)) {i--;continue;}Prisoner prisoner = new Prisoner(code,(long) i + 1);prisoners.add(prisoner);}System.out.println("囚犯初始站位：") ;prisoners.forEach(System.out::println);// 深拷贝remainPrisoners = new ArrayList<>(prisoners);// 开始枪毙囚犯while (remainPrisoners.size() > 1) {killPrisoner();}lastPrisoner = remainPrisoners.get(0);System.out.println("最后一个囚犯编号：" + lastPrisoner.getCode());System.out.println("最后一个囚犯站位：" + lastPrisoner.getFirstPlace() );}

public static boolean existCode(Long code) {// 判断囚犯编号是否存在 使用stream流return prisoners.stream().anyMatch(prisoner -> code.equals(prisoner.getCode()));
}

// 枪毙囚犯（枪毙奇数位置的囚犯）
public static void killPrisoner() {for (int i = remainPrisoners.size(); i > 0 ; i--) {if (i % 2 != 0) {System.out.println(i);remainPrisoners.remove(i-1);}}System.out.println("剩余囚犯：");remainPrisoners.forEach(System.out::println);
}

囚犯类

@Data
@AllArgsConstructor
@NoArgsConstructor
public class Prisoner {private Long code;private Long firstPlace;
}