Newgen Placement Paper -: Java Questions With Answers

Newgen Previous Years Solved Sample Placement Papers

1. What will be the output of the following Java program?

       import java.net.*;
       class networking 
       {
           public static void main(String[] args) throws Exception 
           {
               URL obj = new URL("https://www.sanfoundry.com/javamcq");
               URLConnection obj1 = obj.openConnection();
               int len = obj1.getContentLength();
               System.out.print(len);
           }
       }
       

   Answer: b) 127 Explanation: The length of the content returned by the host URL is 127.
2. Which of the below is not a Java Profiler?

       a) JProfiler
       b) Eclipse Profiler
       c) JVM
       d) JConsole
       

   Answer: c) JVM Explanation: JVM is not a profiler. JProfiler, Eclipse Profiler, and JConsole are used to analyze and profile Java applications.
3. What will be the output of the following Java program?

       import java.net.*;
       class networking
       {
           public static void main(String[] args) throws MalformedURLException
           {
               URL obj = new URL("https://www.sanfoundry.com/javamcq");
               System.out.print(obj.toExternalForm());
           }
       }
       

   Answer: b) https://www.sanfoundry.com/javamcq Explanation: The toExternalForm() method returns the full URL as a string, including the protocol.
4. What will be the output of the following Java code snippet?

       import java.util.*;
       class Arraylists 
       {
           public static void main(String args[]) 
           {
               ArrayLists obj = new ArrayLists();
               obj.add("A");
               obj.add("B");
               obj.add("C");
               obj.add(1, "D");
               System.out.println(obj);
           }
       }
       

   Answer: d) [A, D, B, C] Explanation: The element "D" is inserted at index 1, shifting "B" and "C" one position forward.
5. Which of these packages contains the exception Stack Overflow in Java?

       a) java.io
       b) java.system
       c) java.lang
       d) java.util
       

   Answer: c) java.lang Explanation: StackOverflowError is a part of the java.lang package.
6. What will be the output of the following Java program?

       import java.util.*;
       class Collection_iterators 
       {
           public static void main(String args[]) 
           {
               LinkedList list = new LinkedList();
               list.add(new Integer(2));
               list.add(new Integer(8));
               list.add(new Integer(5));
               list.add(new Integer(1));
               Iterator i = list.iterator();
               Collections.reverse(list);
               Collections.sort(list);
               while(i.hasNext())
                   System.out.print(i.next() + " ");
           }
       }
       

   Answer: a) 1 2 5 8 Explanation: The Collections.sort() method sorts the list, and Collections.reverse() reverses it before sorting, giving the final order: 1, 2, 5, 8.
7. Which of these statements is incorrect about Thread?

       a) start() method is used to begin execution of the thread
       b) run() method is used to begin execution of a thread before start() method in special cases
       c) A thread can be formed by implementing Runnable interface only
       d) A thread can be formed by a class that extends Thread class
       

   Answer: b) run() method is used to begin execution of a thread before start() method in special cases Explanation: The run() method defines the task for the thread, but the start() method must be called to begin execution. run() is never used for starting execution directly.
8. Which of these keywords are used for the block to be examined for exceptions?

       a) check
       b) throw
       c) catch
       d) try
       

   Answer: d) try Explanation: The try block is used to define the code that will be examined for exceptions.