Java Fundamental v2

Java is short for Javascript

False

True

Which environment variable is used to set the Java path?

JAVA

JAVA_HOME

PATH

JAVA_PATH

How do you insert comments in Java code?

-- This is a comment

# This is a comment

// This is a comment

/* This is a comment

What will be the output of the following Java program ?

Command line execution is done as – "java Output This is a command Line"

class Output {

public static void main(String args[])

System.out.print(args[0]);

What will be the output of the following Java program ?

Command line execution is done as – "java Output command Line 10 A b 4 N"

class Output {

public static void main(String args[])

System.out.print((int)args[2] * 2);

Which of the following is a superclass of every class in Java?

String

Object class

Abstract class

ArrayList

What will be the return type of a method that does not return any value?

Double

Void

Int

None of the above

Which modifier cannot be used for constructors?

Static

Private

Public

Protected

Which of these keywords must be used to inherit a class ?

Extends

Extent

This

Super

Which of these is the correct way of inheriting class A by class B?

Class B extends class A {}

Class B inherits class A {}

Class B + class A {}

Class B extends A {}

Which of these keywords can be used to prevent inheritance of a class ?

Final

Class

Transient

Super

Which of these access modifiers can be used for an interface?

Private

Public

Protected

All of the above

Which of these operators can be used to concatenate two or more String objects ?

What is the value returned by function compareTo() if the invoking string is less than the string compared ?

Value greater than zero

Zero

Value less than zero

None of the above

What will this code snippet print?

double decimal = 50.55;
int integer = (int)decimal;
System.out.println(integer/3);

16.67

16.00

What is the output of this code snippet?

int I = 34.0;
int j = 7;

int k = I % j;

System.out.println("k = " + k );

K = 4

K = 6

K = 0

Program doesn't compile

Which of these method of Thread class is used to suspend a thread for a period of time ?

Stop()

Suspend()

Terminate()

Sleep()

Suppose a class has public visibility. In this class we define a protected method. Which of the following statements is correct ?

In a class, you cannot declare methods with a lower visibility than the visibility of the class in which it is defined.

From within protected methods you do not have access to public methods.

This method is only accessible from inside the class itself and from inside all subclasses.

This method is accessible from within the class itself and from within all classes defined in the same package as the class itself.

When you pass an array to a method, the method receives

The length of the array

The reference of the array

A copy of the first element

A copy of the array

Array indexes start with:

What is the output of the following code snippet ?

void testArray(){
  int arrayVariable [] = new int[10];
  for (int I = 0; I < 10; ++i)
  {
    arrayVariable[i] = I;
    System.out.print(arrayVariable[i] + " ");
    i++;
  }
}

Which of the following is a correct way to declare an array in Java ?

Int[] arr1 = new int[3];

Int arr1[] = new int[3];

Both of the above

None of the above

Which of these can be used to differentiate two or more methods having same name ?

Return type of method

Parameters data type

Number of parameters

All of the above

Which of these clause will be executed even if no exceptions are found ?

Catch

Throw

Finally

None of the Above

Which of these types cannot be used to initiate a generic type ?

Collections

Primitive Types

Float class

Integer class

Is this statement true or false: Abstract class can be initiated by the new operator

True

False

Which polymorphism behavior do you see in class below?

class Paint {

// all methods have same name

public void Color(int x) {

}

public void Color(int x, int y) {

}

public void Color(int x, int y, int z) {

}

}

Method overloading

Constructor overloading

Method overriding

None of the above

public abstract class Book {

private String name;

private String author;

private double price;

public Book(String name, String author, double price) {

this.name = name;

this.author = author;

this.price = price;

}

public Book(Book source) {

this.name = source.name;

this.author = source.author;

this.price = source.price;

}

public String getName() {

return this.name;

}

public void setName(String name) {

this.name = name;

}

public String getAuthor() {

return this.author;

}

public void setAuthor(String author) {

this.author = author;

}

public double getPrice() {

return this.price;

}

public void setPrice(double price) {

this.price = price;

}

public class NonFiction extends Book {

private String topic;

public NonFiction(String name, String author, double price, String topic) {

super(name, author, price);

this.topic = topic;

}

public NonFiction(NonFiction source) {

super(source);

this.topic = source.topic;

}

public String getTopic() {

return this.topic;

}

public void setTopic(String topic) {

this.topic = topic;

}

Will this code compile?

Book nonfic = new NonFiction("Silent Spring", "Rachel Carson", 20, "Environmental Science");

nonfic.getTopic();

Yes

Based on the classes defined in Q29, will this compile?

Book book = new Book("Silent Spring", "Rachel Carson", 20);

Yes

What will be the output of the following Java code snippet?

class A
{

}

enum Enums extends A
{
ABC, BCD, CDE, DEF;
}

Runtime Error

Compilation Error

Compile & runs successfully

EnumNotDefined Exception

What will be the output of the following Java code?

class bool_operator {

public static void main(String args[]) {

boolean a = true;
boolean b = !true;
boolean c = a | b;
boolean d = a & b;
boolean e = d ? b : c;
System.out.println(d + " " + e);

}

What is the output for this code snippet?

int[] numbers = new int[] {4, 5, 6};

Arrays.stream(numbers)

.filter((number) -> number < 6)
.map((number) -> number % 2)
.forEach((number) -> System.out.println(number));

What is the output of the following code?

class HelloWorld {

public static void main(String args[]) {

try {

int a = 0;

int b = 5;

int c = a / b;

System.out.print("Hello ");

} catch (Exception e) {

System.out.print("World ");

} finally {

System.out.print("Again");

}

Which of the following is not an object ?

Which method can be used to find the highest value of j & k?

Math.max(j,k)

Math.maximum(j,k)

Math.largest(j,k)

Math.maxNum(j,k)

The value of a String variable can be surrounded by single quotes

True

False

What is the maximum number of Java Class files that can be kept inside a single Java Package?

128

Unlimited

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