Question 1

What is the purpose of the main method in a Java program?

Accepted Answer

to serve as the entry point where the program starts execution

Question 2

Is main a Java reserved word?

Accepted Answer

no

Question 3

Is class a Java reserved word?

Accepted Answer

yes

Question 4

Is void a Java reserved word?

Accepted Answer

yes

Question 5

Is float a Java reserved word?

Accepted Answer

yes

Question 6

What is a key characteristic of object-oriented programming in Java?

Accepted Answer

objects encapsulate state and behavior

Question 7

Is float a Java reserved word?

Accepted Answer

yes

Question 8

Is this a valid Java identifier? variable#name

Accepted Answer

no

Question 9

Is this a valid Java identifier? class

Accepted Answer

no

Question 10

Is this a valid Java identifier? my_Variable

Accepted Answer

yes

Question 11

Is this a valid Java identifier? 3variable

Accepted Answer

no

Question 12

What is a key characteristic of object-oriented programming in Java?

Accepted Answer

objects encapsulate state and behavior

Question 13

Is this a valid Java identifier? variable#name

Accepted Answer

no

Question 14

Is this a valid Java identifier? class

Accepted Answer

no

Question 15

Is this a valid Java identifier? my_Variable

Accepted Answer

yes

Question 16

In Java, what is a method?

Accepted Answer

A named set of instructions to accomplish a task

Question 17

Is this a valid Java identifier? 3variable

Accepted Answer

no

Question 18

What is the difference between syntax and semantics in programming?

Accepted Answer

Syntax defines how code looks, and semantics defines what code does

Question 19

What is the primary purpose of a programming language?

Accepted Answer

to specify the words and symbols used to write a program

Question 20

What is the role of the Java Virtual Machine (JVM)?

Accepted Answer

To execute bytecode and translate it to machine-specific instructions

Question 21

In Java, what is a method?

Accepted Answer

A named set of instructions to accomplish a task

Question 22

What is the difference between syntax and semantics in programming?

Accepted Answer

Syntax defines how code looks, and semantics defines what code does

Question 23

What is the correct syntax to cast a double value x to an integer in Java?

Accepted Answer

(int) x;

Question 24

Which programming language is closest to the machine's hardware?

Accepted Answer

machine language

Question 25

Which of the following is a common error when working with floating-point numbers in Java?

double value = 1.0 / 3.0;
System.out.println(value);  // Output: 0.3333333333333333

Accepted Answer

Round-off errors

Question 26

What is white space in a Java program?

Accepted Answer

Spaces, tabs, and blank lines used to improve code readability

Question 27

What is the correct syntax to cast a double value x to an integer in Java?

Accepted Answer

(int) x;

Question 28

Which of the following is a common error when working with floating-point numbers in Java?

double value = 1.0 / 3.0;
System.out.println(value);  // Output: 0.3333333333333333

Accepted Answer

Round-off errors

Question 29

Which data type would you use to store the value 5.99?

Accepted Answer

double

Question 30

How do you create a Scanner object to read input from the console in Java?

Accepted Answer

Scanner input = new Scanner(System.in)

Question 31

Is this a valid Java identifier? _value3

Accepted Answer

yes

Question 32

How do you declare a constant in Java for the value of pi (3.14159)?

Accepted Answer

constant double PI = 3.14159;

Question 33

Is this a valid Java identifier? final-class

Accepted Answer

no

Question 34

Is this a valid Java identifier? _value3

Accepted Answer

yes

Question 35

What will be the output of the following code?

int a = 5;

int b = a++;

System.out.println(b);

Accepted Answer

5

Question 36

Is this a valid Java identifier? final-class

Accepted Answer

no

Question 37

What will be the output of the following code?

int a = 5;

int b = a++;

System.out.println(b);

Accepted Answer

5

Question 38

What happens when you try to store a number larger than the maximum value of the int type in Java?

int maxInt = 2147483647;

int result = maxInt + 1;

System.out.println(result);

Accepted Answer

Integer overflow occurs, resulting in a wrap-around.

Question 39

What happens when you try to store a number larger than the maximum value of the int type in Java?

int result = 5 / 2;

Accepted Answer

2

Question 40

What is the process of converting a variable from one data type to another?

Accepted Answer

casting

Question 41

What is the process of converting a variable from one data type to another?

Accepted Answer

casting

Question 42

The syntax for an assignment statement is:

Accepted Answer

variable = expression;

Question 43

Declare cheese as an integer variable.

Accepted Answer

int cheese;

Question 44

Declare cheese as a double variable.

Accepted Answer

double cheese;

Question 45

Put a method in the Scanner class to
read a double value from the keyboard.

Accepted Answer

nextDouble()

Question 46

Put a method in the Scanner class to
read a double value from the keyboard.

Accepted Answer

nextDouble()

Question 47

What will be the output of the following code?
int number = 35;
if (number % 2 == 0)
	System.out.println(“Even”)
elseif (number % 5 == 0)
	System.out.println(“Divisible by 5”)
else
	System.out.println(“Odd”)

Accepted Answer

Divisible by 5

Question 48

What is the output of this code snippet?
double result = 1.0 / 0;
System.out.println(result)

Accepted Answer

"Infinity"

Question 49

What is the result of the following code?
int  x = 3;
int y = 2;
if (x > y)
	if (x < 5)
	   x++;
else 
	y++;
System.out.println(x + “, “ + y);

Accepted Answer

4, 2

Question 50

What is the result of the following code snippet?
char ch = ‘A’;
ch = (char) (ch + 3);
System.out.println(ch);

Accepted Answer

D

Question 51

Would assigning a byte value to a short value result in data loss?

Accepted Answer

No

Question 52

Would casting a double value to an int value result in data loss?

Accepted Answer

Yes

Question 53

Would assigning a long value to an int value result in data loss?

Accepted Answer

Yes

Question 54

Would casting a float value to a byte value result in data loss?

Accepted Answer

Yes

Question 55

What will be the result of the following logical expression if x = true and y = false
If (x && !y) {
	System.out.println(“True”);
} else {
	System.out.println(“False”)
}

Accepted Answer

True

Question 56

Which logical operator can be used to test if two Boolean conditions are both true?

Accepted Answer

&&

Question 57

What is the output of the following code?
int x = 5;
int y = 10;
if (x < y)  {
	if (x > 3) {
  	System.out.println(“A”);
} else {
    	System.out.println(“B”);
}
} else { 
    	System.out.println(“C”);
}

Accepted Answer

A

Question 58

What will be printed by this switch case?
int x = 4;

switch(x) {
case 1:
System.out.println(“One”);
break;

case 2:
System.out.println(“Two”);
break;

case 3:
System.out.println(“Three”);
break;

default:
System.out.println(“Other”);
}

Accepted Answer

Other

Question 59

What will the following code print if number = 8?
if (number < 10) {
	if (number % 2 == 0) {
		System.out.println(“Even and Small”);
	}
} else {
	System.out.println(“Large”);
}

Accepted Answer

Even and Small

Question 60

What will the following code output if x = 7?
if (x > 5 && x < 10) {
	System.out.println(“Valid”);
} else if (x == 7) {
	System.out.println(“Equal”);
} else {
	System.out.println(“Invalid”);
}

Accepted Answer

Valid

Question 61

What will the output be for the following logical OR expression?
boolean a = true;
boolean b = false;
if (a | | b) {
	System.out.println(“True”);
} else {
	System.out.println(“False”);
}

Accepted Answer

True

Question 62

In a conditional expression (boolean-expression) ? expression1 : expression2, what happens if the boolean-expression evaluates to true?

Accepted Answer

expression1 is executed

Question 63

What is the purpose of the switch statement in Java?

Accepted Answer

To handle multiple possible values for a single variable

Question 64

Which of the following methods rounds a number to its nearest integer in the Math class?

Accepted Answer

Math.round()

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