questions i tripped on in an interview [closed]

i was asked a few java interview questions which i had no idea how solve could use some answers

1. write a method which takes an int so the method would be

   public void somemethd(int i){}

   Now if i=1 then it should print true and if i=2 it should print false but you cannot use any conditional operators nor can you use if or switch

2. how do two threads pass data in between each other, like let lets say you start 2 threads and you want to make one thread make the other thread wait. he rephrased the question to make it simpler, what if i have a varible in 1 thread and i want to send it to another thread how to do that.

3. what if there is a non static method in base class and you make it a static method in derived class, would you get the same error as if u has a static method in base and u try to make it non static in derived class

4. what is the use of overloading other than same name for different method? (i guess i should have said constructor overloading but it just didnt come to me, is there anything else)

5. the syntax is not correct but u can jus assume everything is fine

   
   
   class base{
   
   show(){
   
   this.mymethod();
   }
   
   mymethod(){
   /...
   }
   }
   
   class derived extends base{
   
   show(){
   
   super.mymethod();
   }
   
   mymethod(){
   /...
   }
   }
   

base b = new derived();

   b.show(); 

derived d= new base();

   d.show();

 base b = new derived();

   b.show(); 

One solution to the updated 1)

void printIsOne(int n) {
   System.out.println("?,true,false".split(",")[n]);
}

2) You cannot pass local variables between threads. However you can pass a value from one thread to another and have it wait for the value. IMHO: The simplest way is to use a BlockingQueue.

3) You get different error in both cases, but basically you cannot change one to the other in a derived class.

4) backward compatilibity. You may have code, e.g. loads of test code, which calls a method with one set of args however you want to change it in some way without changing the existing code.

5) just try it (hint: some combinations get a compiler error)

write a method which takes an int and prints true if 1 and prints false if true but u cant use if or swith or any conditional operators

I'm guessing you mean true if 1 and false if 0, in which case you can do this:

void printValue(int value)
{
    String[] values = { "false", "true" };
    System.out.println(values[value]);
}