Java Basics

Which of the following statements about Java's primitive data types is false?

• Java defines eight primitive types, also referred to as simple types

• The int type is a signed 32-bit type

• The char type is a 16-bit Unicode type with a range of 0 to 65,536

• A boolean value can be implicitly converted to an integer (0 or 1) for use in arithmetic expressions

What will be the output of the following code snippet: System.out.println(10 + 20 + "30");?

• 600

• 10 20 30

• 102030

• 3030

Which of the following is true regarding numeric literals?

• An integer literal, by default, is of type long

• Underscores can be embedded in numeric literals (e.g., 9_423_497_862.0) to improve readability, and they are discarded by the compiler

• A floating-point literal, by default, is of type float

• Character literals are enclosed in double quotes

Which statement correctly describes the declaration and initialization of variables in Java?

• Variables can only be initialized with values that are already known at compile time

• All variables must be initialized at the time of their declaration

• A variable is defined by an identifier, a type, and an optional initializer

• Arrays in Java must always be one-dimensional

Java's bitwise operators can be applied to which of the following data types?

• float and double only

• Integer types: long, int, short, char, and byte

• boolean only

• All primitive types except boolean

What is the outcome of a relational operator in Java?

• An integer value indicating the relationship (e.g., 0 for equality, 1 for greater than)

• A string describing the relationship

• A boolean value (true or false)

• All primitive types except boolean

Consider the following Java code snippet: int result = (value > 10) ? 100 : 50; What does result hold if value is 7?

• 100

• true

• false

• 50

To change the default order of evaluation in an expression, such as forcing an addition to occur before multiplication, which lexical element should be used

• Commas

• Semicolons

• Parentheses

• Square brackets

Which of the following describes a limitation of Java's switch statement compared to the if statement?

• The switch statement can evaluate any type of Boolean expression, while if is restricted to equality tests

• The switch statement can only test for equality between the expression's value and its case constants

• The if statement does not support else clauses, whereas switch does

• switch statements are generally less efficient than a set of nested if statements

What is a characteristic of the do-while loop in Java?

• The loop's condition is evaluated before the body of the loop is executed for the first time

• It is primarily used for iterating over collections and arrays (the "for-each" style)

• The body of the loop is executed at least once, regardless of the initial condition

• It can only be controlled by an integer counter