feofus solutions java interview questions

Today I would like to share an interview experience with you. Any way let me start.

             They conducted a 2 hours written exam which includes technical question as well as aptitude question. I am not bothered about the aptitude question :P from my point of view , one with high technical skill will elected regardless of evaluating their aptitude skills.

                           Well.. now let’s consider the technical questions. They have 4 questions. Two of them related to java collection framework , one is from hashSet and another from hashmap. And the third one related to database queries . It is not that much challenging ; an average programmer can handle that very quickly . For that reason will explain all other questions except the last one.
 

      Before I dive in to the explanation I would like to share my overall outcome or how I treated that event. All those question are very simple to me but for various reasons I can’t perform well in that interview. I am a big fan of ”copy paste code” for that reason I couldn’t reproduce some boilerplate code at that time , and my handwriting is very bad as well , for the last six month I am using eclipse IDE to coding so majority of boilerplate code will generate automatically. And I were playing with Hibernate framework so far for that reason I failed in answering the database related question . Summing up all these the interview result is a big zero. The end of the interview HR said that “after evaluating the exam we will get back to you” and she added that she expected ill more from me. :P.


Using nested for loop print the following pattern .

 1
1 3
1 3 5
1 3 5 7
1 3 5 7 9


The answer is simple . Using following nested loop we can print a pattern

  for(int i=1;i<10;i+=2){   
     for(int j=1;j<i+1;j+=2){   
       System.out.print(j+" ");   
     }   
     System.out.println("\n");   
   }  

Now lets consider the collection framework questions . Those questions are simple enough; Define one hashmap and arraylist and then add some values and print those values using iterator , add one null value to it and check against those null value; that’s all.

Answer:

 import java.util.ArrayList;  
 import java.util.HashMap;  
 import java.util.Iterator;  
 import java.util.ListIterator;  
 import java.util.Set;  
 class Student{  
      Long id=null;  
      String name=null;  
      Student(Long id,String name){  
           this.id=id;  
           this.name=name;  
      }  
 }  
 public class StringFunction {  
      public static void main(String[] args) {  
  ArrayList<String> list=new ArrayList<String>();  
  list.add("sudeep");  
  list.add("cv");  
  list.add("miyas");  
  System.out.println(list);  
  list.add("last");  
  System.out.println(list);  
  list.remove(1);  
  System.out.println(list);  
  ListIterator<String> iterator=list.listIterator();  
  while(iterator.hasNext()){  
       String value=iterator.next();  
       System.out.println(value);  
  }  
  HashMap<String,String> map=new HashMap<String, String>();  
  map.put("sudeep", "java Developer");  
  map.put("John", "web designer");  
  System.out.println(map);  
  Set<String> keys=map.keySet();  
  Iterator<String> mapiterator=keys.iterator();  
  while(mapiterator.hasNext()){  
       System.out.println("the Value is:"+map.get(mapiterator.next()));  
  }  
  Student obj1=new Student(1l,"sudeep");  
  Student obj2=new Student(2l,"");  
  Student obj3=new Student(3l,"Manu");  
  HashMap<Long, Student> stdMap=new HashMap<Long, Student>();  
  stdMap.put(1l, obj1);  
  stdMap.put(2l, obj2);  
  stdMap.put(3l, obj3);  
  Set<Long> stdMapkeys=stdMap.keySet();  
   Iterator<Long> stdMapkeysIterator=stdMapkeys.iterator();  
   while(stdMapkeysIterator.hasNext()){  
        Student oneStudent=stdMap.get(stdMapkeysIterator.next());  
        System.out.println("Id:"+oneStudent.id+"\n");  
        System.out.println("Name:"+oneStudent.name+ "\n");  
        if(oneStudent.name.isEmpty())  
             System.out.println("this name is null");  
       // System.out.println("first print"+stdMap.get(stdMapkeysIterator.next()).name.isEmpty());  
   }  
 }  
 }