Basic Java Sytax And Code

Front 1

One of the variables of a class template which may have a different value for each object of that class; ________ _________ hold the state of an object.

Back 1

instance variables

Front 2

Name the 5 arithmetic operators:

Back 2

+ additive operator (also used for String concatenation)
- subtraction operator
* multiplication operator
/ division operator
% remainder operator

Front 3

Define "short-circuting" behavior in relationship to conditional operators(&& and ||)

Back 3

The second operand(expression) is evaluated only if needed.

Front 4

A _________ forms a complete unit of execution. Here are some examples:

aValue = 8933.234; // assignment

aValue++; // increment

System.out.println("Hello World!"); // method invocation

Bicycle myBike = new Bicycle(); // object creation

double aValue = 8933.234; //declaration

Back 4

statement

Front 5

What is this code called and what does it do?

switch (expression) {
case cond1: code_block_1;
case cond2: code_block_2;
...
case condn: code_block_n;
default: code_block_default;
}

Back 5

The switch statement allows for any number of possible execution paths.

Hint 5

A switch works with the byte, short, char, and int primitive data types. It also works with enumerated types and a few special classes that "wrap" certain primitive types: Character, Byte, Short, and Integer.

Front 6

A _____ ________ is any field declared with the static modifier; this tells the compiler that there is exactly one copy of this variable in existence, regardless of how many times the class has been instantiated.

Back 6

class variable

Front 7

What does a break statement do?

Back 7

An unlabeled break statement terminates the innermost switch, for, while, or do-while statement, passing control to the next line of programming following the current loop. A labeled break terminates an outer statement.

Hint 7

* The break statement should normally be used at the end of each case statement of a switch statement.

* In other contexts, the break statement is never necessary; it can always be elimitated by rearranging the code.

* Use of the break statement violates the rules of structured programming.

Front 8

Name the 6 Equality and Relational Operators:

Back 8

== equal to
!= not equal to
> greater than
>= greater than or equal to
< less than
<= less than or equal to

Front 9

How does this code work?

result = someCondition ? value1 : value2;

Back 9

If someCondition is true, assign the value of value1 to result. Otherwise, assign the value of value2 to result.

Hint 9

This operator is also known as the ternary operator(?:) because it uses three operands.

Front 10

A _____ is the blueprint from which individual objects are created.

Back 10

class

Front 11

A _____ is a group of zero or more statements between balanced braces and can be used anywhere a single statement is allowed.

Back 11

block

Front 12

The ____ data type is an 8-bit integer number. It has a minimum value of -128 and a maximum value of 127.

Back 12

byte

Hint 12

This data type is one of the eight primitive data types.

Front 13

The while statement continually executes a block of statements while a particular condition is true. How is its syntax expressed?

Back 13

while (expression)
{statement(s)}

Hint 13

You can implement an infinite loop using the while statement as follows:

while (true)
{
// your code goes here
}

Front 14

Similar to how an object stores its state in fields, a method will often store its temporary state in ______ ________. These are only visible to the methods in which they are declared; they are not accessible from the rest of the class.

Back 14

local variables

Front 15

The _____ data type is a single-precision 32-bit decimal number.This data type should never be used for precise values, such as currency.

Back 15

float

Hint 15

This data type is one of the eight primitive data types.

Front 16

The ________ statement skips the current iteration of a for, while , or do-while loop. The unlabeled form skips to the end of the innermost loop's body and evaluates the boolean expression that controls the loop.

Back 16

continue

Front 17

What does this code do?

if(value1 == 1)&&(value2 == 2)
System.out.println(value1 + value2);

Back 17

If value1 is equal to 1 AND value2 is equal to 2 then the program will print out the value of both added together: "3"

Front 18

What are the 5 Unary Operators?

Back 18

+ Unary Plus Operator
- Unary Minus Operator
++ Increment Operator
-- Decrement Operator
! Logical Compliment Operator

Hint 18

#1)indicates positive value
#2)negates an expression
#3)increments a value by 1
#4)decrements a value by 1
#5)inverts the value of a boolean

Front 19

The first element in an array, accessed by its numerical index, begins with what number?

Back 19

0

Hint 19

It is not the number 1.

Front 20

Object-oriented programming allows classes to ______ commonly used state and behavior from other classes.

Back 20

inherit

Front 21

What code syntax is used for an if-then statement?

Back 21

if(condition)
{
statement;
}

Front 22

The _____ data type is a 16-bit integer number. It has a minimum value of -32,768 and a maximum value of 32,767.

Back 22

short

Hint 22

This data type is one of the eight primitive data types.

Front 23

What is the difference between a while statement and a do-while statement?

Back 23

The do-while evaluates its expression at the bottom of the loop instead of the top. Therefore, the statements within the do block are always executed at least once. The while statement evaluates its expression at the beginning of each loop.

Hint 23

The syntax for a do-while statement is:

do {
statement(s)
} while (expression);

Front 24

The data type of a returned value must match the type of the method's declared return value. When a method is declared ____, use the form of return that doesn't return a value.

Back 24

void

Front 25

The ______ data type is a double-precision 64-bit decimal number. This data type should never be used for precise values, such as currency.

Back 25

double

Hint 25

This data type is one of the eight primitive data types.

Front 26

An ______ is a container object that holds a number of values of a single type.

Back 26

array

Hint 26

Note: Each element(value) is accessed by its numerical index. Numbering begins with 0. The 9th element, for example, would therefore be accessed at index 8.

Front 27

The ______ statement exits from the current method, and control flow returns to where the method was invoked.

Back 27

return

Front 28

What does this code do?

if(value1 == 1)||(value2 == 2)
System.out.println("Hello");

Back 28

If value1 is equal to 1 OR value2 is equal to 2 then the program will print out "Hello"

Front 29

An __________ is a construct made up of variables, operators, and method invocations, which are constructed according to the syntax of the language, that evaluates to a single value.

Back 29

expression

Front 30

A Java _________ allows unrelated objects to interact with one another. It defines a set of methods but does not implement them.

Classes that implement this agree to implement all of the methods defined in it, thereby agreeing to certain behavior.

Back 30

interface

Hint 30

You can't specify static methods in one of these.

Front 31

What is the range of this arrays index?

arrayName = new int[10];

Back 31

0 - 9

Hint 31

The first element in an array is not 1.

Front 32

What code syntax is used for an if-then-else statement?

Back 32

if(condition)
{statement1;}
else
{statement2;}

Front 33

The ___ data type is a 32-bit integer number. It is the most common type.

Back 33

int

Hint 33

This data type is one of the eight primitive data types.

Front 34

What is the syntax of a for statement?

Back 34

for (initialization; termination; increment) {
statement(s)
}

Hint 34

The three expressions of the for loop are optional; an infinite loop can be created as follows:

for ( ; ; ) { // infinite loop

// your code goes here
}

Front 35

Object-oriented programming allows classes to inherit commonly used state and behavior from other classes.
The syntax for creating a subclass is simple. At the beginning of your class declaration, use the _______ keyword, followed by the name of the superclass.

Back 35

extends

Front 36

The _______ data type has only two possible values: true and false.

Back 36

boolean

Hint 36

This data type is one of the eight primitive data types.

Front 37

An ______ is a software bundle of related state and behavior.

Back 37

object

Hint 37

These are often used to model the real-world things that you find in everyday life.

Front 38

A _______ is a namespace that organizes a set of related classes and interfaces.

Back 38

package

Hint 38

The Java platform provides an enormous class library (of these) suitable for use in your own applications. This library is known as the "Application Programming Interface", or "API" for short.

Front 39

How many values does this array hold?

double[] anArrayOfDoubles;

Back 39

an unspecified number

Front 40

The ____ data type is a 64-bit integer. It has a larger range than the int type.

Back 40

long

Hint 40

This data type is one of the eight primitive data types.

Front 41

As an example: Bicycle would be a __________ with MountainBike, RoadBike, and TandemBike being three of it's ________.

Back 41

superclass, subclasses

Front 42

The ____ data type is a single 16-bit Unicode character.

Back 42

char

Hint 42

This data type is one of the eight primitive data types.

Front 43

What is the name of this kind of array?

String[][] names = {{"Mr. ", "Mrs. ", "Ms. "},{"Smith", "Jones"}};

Back 43

multidimensional array

Front 44

To return a value, simply put the value (or an expression that calculates the value) after the ______ keyword.

Back 44

return