Intervyuda mantiqiy muammolar

Mendan 5 ta mantiqiy muammolarni va 4 ta Java muammosini tahlil qilishingiz kerak. Suhbat davomida duch kelgan muammolar va ularni hal qilish usullari Internetda mavjud. Men intervyu paytida duch kelganlar ro'yxatini beraman.

1. Shlyapa kiygan to'rt kishi

2. Ko'prik va chiroq haqida muammo

3. 9 tangadan bittasi soxta: u engilroq. Uni tarozida ikkita tortishda qanday topish mumkin?

4. Oldingi muammo bilan deyarli bir xil, faqat tarozi har qanday bo'lishi mumkin. Muammo "5 banka tabletkalar" .

5. "Cheksiz poezd"

Suhbat davomida berilgan savollarni yoritish uchun:

1. Java-da singletonni amalga oshirishning bir necha usullarini yozing.

2. Ushbu kodda nima sodir bo'ladi?

   class MyExc1 extends Exception{}
   class MyExc2 extends Exception{}
   class MyExc3 extends Exception{}
   
   public class Test {
       public static void main(String[] args) throws Exception {
           try {
               System.out.print(1);
               p();
           }catch (MyExc2 e){
           }
           finally {
               throw new MyExc3();
               System.out.print(2);
           }
       }
       public static void p() throws Exception {
           try {
               throw new MyExc1();
                } catch (MyExc1 myExc1) {
               throw new MyExc2();
           }finally {
               System.out.println(3);
           }
       }
   }

3. Muammo mendan, chunki qanday misol borligini eslay olmayman

   public class Test {
       public static void main(String[] args)  {
           String s = "Hello";
           String s1 = "Hello";
           String s2 = new String("Hello");
   
           System.out.println(s == s1);
           System.out.println(s1 == s2);
   
           Integer i = 111;
           Integer i1 = 111;
           Integer i2 = new Integer(111);
           Integer i3 = new Integer(111);
   
           Integer i4 = -129;
           Integer i5 = -129;
           Integer i6 = new Integer(-129);
   
           System.out.println(i == i1);
           System.out.println(i1 == i2);
           System.out.println(i2 == i3);
   
           System.out.println(i4 == i5);
           System.out.println(i5 == i6);
   
           System.out.println(i6 == -129);
       }
   }

4. Dasturni ishga tushirish natijasi qanday bo'ladi? Va agar oxirgi ikki qatorni izohlasak, qanday natijaga erishamiz?

   class Test{
       private int id;
       private Integer id2;
   
       public Test(int id, Integer id2) {
           System.out.println("Создаем екзепляр Test");
           this.id = id;
           this.id2 = id2;
       }
   
       public Integer doIt(){
           return id + id2;
       }
   }
   class Test1{
       private Test test;
       private static int i;
   
       public Test1() {
           System.out.println("Создаем екзепляр Test1");
           this.test = new Test(i, 10);
       }
       public Test getTest() {
           return test;
       }
   }
   
   class Main {
       public static void main(String[] args)  {
           Test1 test1 = new Test1();
           System.out.println(test1.getTest().doIt());
          // Test test = new Test(null, 1);
          // test.doIt();
       }
   }

PS: Mantiqiy muammolarga javoblarni hammasini Internetda topish mumkin. Qiziqqanlar uchun men java dasturchi intervyulari haqida oldingi postni ilova qilaman