TCS Tech Lounge JAVA Final-12

What stream type provides input from a disk file?

ANS: FileReader

Read() method of FileInputStream returns -1 when end of the file is reached

ANS: TRUE

Public class Test1{

Public static void main(String args[]){

Try{

Int answer =20/0;

}

Catch(ArithmeticException e){

//some code

}

Catch(Exception e){

//some code}

Catch(NullPointerEception e){

//some code

}

}

Select one or more true statements for above code

ANS: we will get unreachable catch block for NullPointerException, as it is already handled by the catch block for Exception

public class TestDemo{

                                public static void main(String[] args){

                                    TestDemo testObj = new TestDemo();

                                    testObj.start();

                                }

                                void start()

                                {

                                    long[] a1 = {3,4,5};

                                    long[] a2 = fix(a1);

                                    System.oit.print(a1[0]+a1[2]+"");

                                    System.out.println(a2[0]+a2[1]+a2[2]);

                                }

                                Long[] fix(long[] a3){

                                    A3[1] = 7;

                                    Return a3;

                                }

}

ANS:  15 15

What Is the main difference between the JRE and the JDK?

ANS:  The JRE includes the virtual machine

One class has an attribute which refers to another class. The relationship will be termed as _ _ _ _

ANS: Asscociation

Public class Test1{

                                Public static void main(String args[]){

                                    Try{

                                                Int answer =20/0;

                                    }

                                    /** Enter code here line 6 **/

                                    }

                                }what code can we enter at line 6? Select all that apply.

ANS: ALL the above

class Demo{

                                public static void main(String[]args){

                                    String s1=new String("hello");

                                    String s2=new String("hellow");

                                    System.out.println(s1=s2);

                                }

} What would be the output of the code mentioned above?

ANS: hellow

What is the return type of readBoolean() in DataInputstream?

ANS: Boolean

Which of the following statements are true?

ANS: Unicode characters are all 16-bits.

String Objects are mutable objects?

ANS: FALSE

_ _ _ _ _ class is called as the super class of all classes

Ans: java.lang.Object

The StreamReader can use the platform default encoding only

Ans: false                       

Is readBoolean() method of DataInputStream final?

ANS: True

What is used by executables to locate class files?

ANS: Class Path

Which of these ways used to communicate from an applet to servlet?

ANS: All mentioned above( RMI Communication, HTTP Communication, Socket Communication )

Every statement in java programming language ends wih

ANS: semicolon

public class Exam1{

                                public static void main(String[] args){

                                    int arr[] = new int[-3];

                                    for(int i=0;i<arr.length;i++){

                                                System.out.println(arr[i]);

                                    }

                                }

}

ANS: NegativeArrayException RuntimeError