TCS Tech Lounge JAVA Final-1

import java.util.*;

class hashtable{

            public static void main(String args[]){

                        Hashtable obj = new Hashtable();

                        obj.put("A",new Integer(3));

                        obj.put("B",new Integer(2));

                        obj.put("C",new Integer(8));

                        obj.remove(new String("A"));

                        System.out.print(obj);

            }

}

Ans: {C=8, B=2}

Consider the following Schema?

STUDENTS(student_code, first_name,last_name, email, phone_no, date_of_birth, honours_subject, percentage_of_marks); Which of the following query would display names and percentage of marks of all  students stored by honours subject,and then order by percentage of marks?

Ans: (a) Select first_name, lastname, hours_subject, percentage_of_marks from students order by honours_subject,percentage_of_marks.

Which of the following statements are incorrect?

Ans: Strings in java are mutable.

Which statements is true for request.getSession(true) method?

Ans:  getSession(true) method always returns a new session

In HTTP Request method Get request is secured because data is exposed in URL bar?

Ans: False

JDK stands for

Java Development Kit

import java.util.*;

public class Test{

            public static void main(String args[]){

                        System.out.println(new Test().mystery("DELIVER"));

            }

            public String mystery(String s){

                        String s1 = s.substring(0,1);

                        String s2 = s.substring(1,s.length()-1);

                        String s3=s.substring(s.length()-1);

                        if(s.length()<=3)

                                    return s3+s2+s1;

                        else return s1+mystery(s2)+s3;

            }

}

Ans: DEVILER

import java.util.*;

public class Test{

            public static int intValue;

            public static void main(String args[]){

            System.out.println(intValue);

            }

           

}

Ans: 0

FileOutputStream is meant for writing streams of_ _ _ _ _  _

Ans: raw bytes

                

What is the return type of reverse() method in StringBuffer class?

Ans: StringBuffer

Which of these is an incorrect array declaration?

Ans:  (d) int arr[] = int [5] new

_ _ _ _ is used to compare equality of two Strings

Ans: equals() method of Strong class

Which of these statements can skip processing remaining of code in this its body for a particular iteration?

Ans: continue

New drivers can be plugged-in to the JDBC API without changing the client code.

Ans: TRUE

What exception is thrown by read() method of InputStreamReader?

Ans: IOException

JAVA_HOME points to which directory?

Ans: JDK Installation directory.

In which package can we found DataInputStream class?

Ans: java.io

Is write() method in BufferedWriter Class overloaded?

Ans: TRUE

Which of the following is implemented by OutputStream class?

Ans: All of the mentioned. (closeable, flushable,autocloseable)

import java.util.*;

public class Test{

            public static void main(String args[]){

            int num=10;

            switch(num);

            }

           

}

Ans: Compiler Error

JDk7 introduced a new version of the try statement known as____

Ans: try-with-resources statement

Which of these exception is thrown in cases when the file specified for writing it not found?

Ans: FileNotFoundExcepion

public void foo(boolean a, boolean b){

                        if(a)

                        {

                                    System.out.println("A"); // line 5

                        }else if(a&&b){ //line 7

                                    System.out.println("A&&B");

                        }else{ // line 11

                                    if(!b){

                                                System.out.println("notB");

                                    }else{

                                                System.out.println("ELSE");

                                    }

                        }

            }

ANS: If a is false and b is true then the output is “ELSE”