Introduction to Java Programming

Question 1

It marks the beginning of a comment

Answer 1

//

Question 2

Is associated with the beginning of the class definition. All of the programming statements that are part of the class are enclosed in this.

Answer 2

{}

Question 3

Marks the beginning of a single line comment

Answer 3

// //(Double slash)

Question 4

Marks the beginning of a multiple line comment

Answer 4

/* */

Question 5

Used in a method header

Answer 5

{ } (Opening and closing braces)

Question 6

Encloses a string of characters, such as a message that is to be printed on the screen

Answer 6

” “ (Quotation marks)

Question 7

Marks the end of a complete programming statement

Answer 7

; (Semicolon)

Question 8

Is part of the Java API. It has member objects and methods for performing system-level operations, such as sending output to the console.

Answer 8

The System class

Question 9

is a member of the System class. It provides methods for sending output to the screen.

Answer 9

The out object

Question 10

are members of the out object. They actually perform the work of writing characters on the screen.

Answer 10

The print and println methods

Question 11

It displays output on the screen and does not advance the cursor to the next line after its message is displayed

Answer 11

print method

Question 12

It displays its message, it advances the cursor to the beginning of the next line

Answer 12

println method

Question 13

Advances the cursor to the next line for subsequent printing

Answer 13

\n (Newline)

Question 14

Causes the cursor to skip over to the next tab stop

Answer 14

\t (Horizontal tab)

Question 15

Inserts a backspace into the text at this point.

Answer 15

\b (Backspace)

Question 16

Causes the cursor to go to the beginning of the current line not the next line

Answer 16

\r (Return)

Question 17

Causes a backslash to be printed

Answer 17

\ (Backslash)

Question 18

Causes a single quotation mark to be printed

Answer 18

\’ (Single quote)

Question 19

A punctuation mark used in a method header.

Answer 19

\“(Double quote)

Question 20

Types of programming error

Answer 20

Syntax error, Runtime error, Logical error

Question 21

It is also called parsing errors

Answer 21

Syntax error

Question 22

It occurs at compile time in traditional programming languages and at interpret time in interpreter

Answer 22

Syntax error

Question 23

Any violation of rules and poor understanding of the programming language results to this error.

Answer 23

Syntax error

Question 24

It is also called exceptions occur during execution (after compilation/ interpretation).

Answer 24

Runtime error

Question 25

Some examples are, dividing by zero error, insufficient memory for dynamic memory allocation, referencing out-of-range array element.

Answer 25

Runtime error

Question 26

These are not detected by com-piler while compilation process.

Answer 26

Runtime error

Question 27

The most difficult type of errors to track down.

Answer 27

Logical error

Question 28

They occur when you make a mistake in the logic that drives your program and you do not get the result you expected.

Answer 28

Logical error

Question 29

These errors occur due to incorrect translation of algorithm into the program, poor understanding of the problem and a lack of clarity of hierarchy of operators

Answer 29

Logical error

Question 30

It is a programmer-defined name that represents some element of a program

Answer 30

Identifiers

Question 31

Examples of Identifiers

Answer 31

Variable names and class names

Question 32

Beginning an identifier with a lowercase letter and capitalizing subsequent words within the identifier is a style known as ____?

Answer 32

Camel Casing

Question 33

describes the type of data that can be stored there, how much memory the item occupies, and what types of operations can be performed on the data.

Answer 33

The Data Type

Question 34

Integers in the range of −128 to +127

Answer 34

byte (1 byte)

Question 35

Integers in the range of −32,768 to +32,767

Answer 35

short (2 byte)

Question 36

Integers in the range of −2,147,483,648 to +2,147,483,647

Answer 36

int (4 byte)

Question 37

Integers (−9,223,372,036,854,775,808 to +9,223,372,036,854,775,807)

Answer 37

long (8 byte)

Question 38

Floating-point numbers in the range of ±3.4 × 10−³⁸ to ±3.4 × 10³⁸, with 7 digits of accuracy

Answer 38

float (4 byte)

Question 39

Floating-point numbers in the range of ±1.7 × 10−³⁰⁸ to ±1.7 × 10³⁰⁸, with 15 digits of accuracy

Answer 39

double (8 byte)

Question 40

can hold single character only

Answer 40

char (2 byte)

Question 41

can hold boolean value which is true or false

Answer 41

boolean (1 bit)

Question 42

is a statement that reserves a named memory location

Answer 42

Variable Declaration

Question 43

It includes byte, short, int and long datatype.

Answer 43

The integer Data Types

Question 44

The floating-point numbers include fractional values and whole number.

Answer 44

The Floating-point Data Types

Question 45

is used to store characters.

Answer 45

The char Data Type

Question 46

can hold one character at a time.

Answer 46

The char Data Type

Question 47

Character literals are enclosed in single quotation marks.

Answer 47

The char Data Type

Question 48

Every character have an equivalent number based in ASCII code.

Answer 48

The char Data Type

Question 49

Characters are internally represented by numbers. Each printable character, as well as many non-printable characters, is assigned a unique number.

Answer 49

Unicode

Question 50

How many bytes does the Unicode require for memory?

Answer 50

two bytes

Question 51

lets you manually convert a value, even if it means that a narrowing conversion will take place.

Answer 51

Type Casting

Question 52

are unary operators that appear as a data type name enclosed in a set of parentheses.

Answer 52

Type Casting

Question 53

This line is known as a method header. It marks the beginning of a method.

Answer 53

public static void main(String[] args)

Question 54

Can be thought of as a group of one or more programming statements that collectively has a name.

Answer 54

Method

Question 55

When you declare a variable but do not assign a value to it.

Answer 55

Uninitialized Variable

Question 56

An uninitialized variable contains an unknown value called?

Answer 56

Garbage Value

Question 57

When the + operator is used with strings ("hello" + "world") it is called the?

Answer 57

String Concatenation Operator

Question 58

Means to append

Answer 58

Concatenate

Question 59

When the + operator is used with two numbers as operand the + sign will be used as?

Answer 59

Operator Strings

Question 60

How many bytes and bits in one byte?

Answer 60

1 byte, 8 bits

Question 61

How many bytes in short?

Answer 61

2 bytes

Question 62

How many bytes in int?

Answer 62

4 bytes

Question 63

How many bytes in long?

Answer 63

8 bytes

Question 64

How many bytes in float?

Answer 64

4

Question 65

How many bytes in double?

Answer 65

8 bytes

Question 66

How many bytes in char?

Answer 66

2 bytes

Question 67

How many bits in boolean?

Answer 67

1 bit