Free Online 5 Minute Java Test

Question: Identify correct statements about the module system of Java.

Select 2 option(s)

Question: Given:

public class TestClass {

    static int count = 0;

    public static void main(String[] args) throws Exception{

        ExecutorService es = Executors.newFixedThreadPool(5);

        for(int i=0; i<5; i++){

            es.submit(  () ->

            {

                for(int j=0; j<5000; j++){

                    TestClass.count++;

                }

            }

            );

        }

        es.awaitTermination(10, TimeUnit.SECONDS);

        es.shutdownNow();

        System.out.println(count);

    } 

}

Identify correct statement(s) about the above code.

Select 2 option(s)

Question: What is wrong with the following code written in a single file named TestClass.java?

class SomeThrowable extends Throwable { }

class MyThrowable extends SomeThrowable { }

public class TestClass{

   public static void main(String args[]) throws SomeThrowable{

      try{

         m1();

      }catch(SomeThrowable e){

         throw e;

      }finally{

         System.out.println("Done");

      }

   }

   public static void m1() throws MyThrowable{

      throw new MyThrowable();

   }

}

Select 1 option(s)

Question: Consider the following code:

class A {

    public void doA(int k) throws Exception {  // 0

        for(int i=0; i< 10; i++) {

            if(i == k)

                throw new Exception("Index of k is "+i); // 1

        }

    }

    public void doB(boolean f) { // 2

        if(f) {

            doA(15); // 3

        }

        else return;

    }

    public static void main(String[] args) { // 4

        A a = new A();

        a.doB(args.length>0); // 5

    }

 }

Which of the following statements are correct?

Select 1 option(s)

Question: What will be the result of attempting to compile and run the following program?

class TestClass{

   public static void main(String args[]){

      var i = 0;

      for (i=1 ;  i<5  ; i++) continue;  //(1)

      for (i=0 ;       ; i++) break;       //(2)

      for (    ; i<5?false:true ;    );     //(3)

   }

}

Question: Which of the following are benefits of polymorphism?

Select 2 option(s)