core java

Suppose you create an Employee class and declare the class variable numberContract. You then create an instance of the Employee class - accountEmployee. Identify the lines of code you can use to access the class variable numberContract.(Please select ALL that apply)

Select an answer*A. accountEmployee.numberContract = 10;B. Employee accountEmployee = new Employee();*C. Employee.numberContract = 10;D. static intnumberContract;

Given: String x = new String("xyz"); y = "abc"; x = x+y; How many String objects have been created?

Select an answerA. 2*B. 3C. 4D. 5

Which two are true?

Select an answerA. A finalizer may NOT be invoked explicitlyB. The finalize method declared in class Object takes no actionC. super.finalize() is called implicitly by any overriding finalize

method*..D. The finalize method for a given object will be called no more

than once by the garbage collector

Which of the following is/are legal method declarations?

Select an answerA. protected abstract void m1();B. static final void m1(){}C. synchronized public final void m1() {}D. private native void m1();*E. ...All the options are correct

The following cannot be abstract:(Please select ALL that apply)

Select an answer*A. Constructors*B. Static methods*C. Private methodsD. Interface methods

Choose which definitions holds good for variables.

Select an answer**A. Variables that are defined inside a method and are called local,

automatic, temp, or stack variablesB. Variables created when the method is executed are destroyed when the

method is exited

C. Variables are created by the JVMD. Variables cannot be de-referencedE. None of the options are correct

Identify the correct signature of the main method.

Select an answerA. public static int main (String args[])B. public static void main (String args)*C. public static void main (String args[])D. public void main (String[])

How do you initialize a variable using a static initialization block?(Please select ALL that apply)

Select an answerA. Declare the variable within the classB. Enclose the single-line initializer within a try-catch blockC. Perform the initialization inside a constructor*D. Place the initialization code inside a static block

To move control to the start of next repetition, which statement should be used?

Select an answerA. While statementB. If-else statementC. Break statement*D. Continue statement

What is an array?

Select an answerA. An array is a method that stores a list of itemsB. An array is a class that stores a list of items*C. An array is an object that stores a list of itemsD. An array is a message that stores a list of items

Some exceptions can occur in a program, but do not prevent compilation if they are not handled or declared. Which events can cause such exceptions?(Please select ALL that apply)

Select an answer*A. A method tries to open a fileB. An application tries to create an array that has negative size*C. An index, such as an array, is out of rangeD. Any attempt to access the contents of a SQL database

Some exceptions can occur in a program, but do not prevent compilation if they are not handled or declared. Which events can cause such exceptions?(Please select ALL that apply)

Select an answerA. A method tries to open a fileB. An application tries to create an array that has negative sizeC. An index, such as an array, is out of range

D. Any attempt to access the contents of a SQL database

Java technology supports two types of streams:(Please select ALL that apply)

Select an answer*A. Character*B. ByteC. ShortD. Float

A byte can be of what size?

Select an answer*A. -128 to 127B. (-2 power 8)-1 to 2 power 8C. -255 to 256D. Depends on the particular implementation of the Java Virtual machine

Question: 15 of 30lt043991enQ0109Which of the following are true?(Please select ALL that apply)

Select an answer*A. TheInputStream and OutputStream classes are byte-orientedB. The ObjectInputStream and ObjectOutputStream do not support

serialized object input and output*C. The Reader and Writer classes are character-orientedD. The Reader and Writer classes are the preferred solution to

serialized object output

When a Java program tries to divide by zero; the runtime will create and throw an object of Arithmetic Exception.

Select an answer*A. TRUEB. FALSE

a method with no access modifiers CAN be overridden by a method marked protected.


Question: 18 of 30lt043991enQ0006The Vector class implements a growable array of objects.


x=true; y=true; What is the result of x and y?


_____________ expressions are a way to describe a set of strings based on common characteristics shared by each string in the set. They can be used to search, edit, or manipulate text and data.

Select an answer*..A. PredefinedB. Interface

An object means, anything that can D25be seen or touched; material thing.

Select an answer*..A. TRUEB. FALSE

<p>Will this compile?</p> float f = 27.24f;

Select an answer*A. YesB. No

The main() method in java can be overloaded. State true or false.


The user can also create her own exception classes by inheriting from the class Exception.


Procedures with common functionality are grouped into modules.


JVM is Platform Independent.

Select an answerA. TRUE*B. FALSE

Both the methods sleep and join throws Interrupted Exception.

Select an answer..A. TRUEB. FALSE

A base class reference can be used to access the sub class methods.

Select an answerA. TRUE*B. FALSE

Which code segments, if included in an interface, would cause a compiler error?(Please select ALL that apply)

Select an answer*A. protected void selectShipmentType(int type);*B. public final void printShippingDetails();C. static final int MAX = 100;D. void printShippingDetails();

JVM stands for java virtual machine.


core java

Engineering