Java Fundamentals MCQs

What is the default value of a local variable in Java?

• 0

• null

• Depends on data type

• Compilation error

Which of these is a valid identifier in Java?

• 2value

• _value

• @value

• value#

What will be the output of the following code? int x = 5; int y = 10; System.out.println(x + y + "Hello");

• 15Hello

• Hello15

• 5Hello10

• Compilation error

Which keyword is used to define a constant in Java?

• static

• final

• const

• constant

Which of these is not a primitive data type in Java?

• int

• boolean

• String

• double

What is the result of the following code? int x = 10; System.out.println(x > 10 ? "Greater" : "Not Greater");

• Greater

• Not Greater

• true

• false

What is the output of this code? char c = 65; System.out.println(c);

• A

• 65

• Error

• a

What is the output of this code? int i = 10; int j = i++ + ++i; System.out.println(j);

• 21

• 22

• 20

• 23

What is the result of this expression? System.out.println(10 + 20 + "30" + 40 + 50);

• 30304050

• 30 + "30" + 40 + 50 = "30304050"

• 303050

• 30304050

Which of the following lines will compile without errors?

• float f = 3.14;

• float f = 3.14f;

• float f = (float)3.14;

• Both B and C