Ch 7-8

Front 1

Array-

Back 1

A sequence of values of the same data type

Front 2

Array element?

Back 2

one value of the array

Front 3

Elements idenetified by what postion?

Back 3

index

Front 4

Syntax for Declaring an array?

Back 4

data type [length] array-variable-name;

int[] data;

Front 5

syntax for declaring and instantiating an array?

Back 5

data type [length] array-variable-name = new data type [length]

Front 6

syntax using an individual element of an array?

Back 6

data[index position];
like
data[0];

Front 7

When array first created its values intitalize to what?
numeric intitializes to ?
boolean?
object references?

Back 7

0
false
null

Front 8

To determine the number of elements in an array use what field?

Back 8

length field

data.length

Front 9

The lenght of an array is always be?

Back 9

one greater then the index

Front 10

Syntac for Declaring and instantiating an ArrayList of objects?

Back 10

ArrayList <bankAccounts> accounts= new ArrayList <bankAccounts>;

ArrayList<objecType> listName = new ArrayList<objectType>;

Front 11

Add method does what?

Back 11

adds a new element to the ArrayList
data[10] add one now you have data[11]

and index 0-10

Front 12

size() method does what?

Back 12

determine the number of elements in the array list

Front 13

syntax for add method

Back 13

data.add(new data(the old number of the index));

Front 14

Wrapper classes?

Back 14

used to treat primitive type values as objects

Front 15

auto-boxing?

Back 15

automatic conversion between primitive types and the corresponding wrapper classes

Front 16

syntax for Enhanced For Loops?

Back 16

for(int data : array or arraylist name)

Front 17

Enhanced for loop does what?

Back 17

variable name is assigned one by one to each element in the array or array list.

then you use the variable name to manipulate the actual element within the loop body

Front 18

Two-demensional arrays?

Back 18

ROWS ARE VERTICAL

COLUMNS ARE HORIZONTAL

Front 19

syntax for declaring and instantiating a two-demensional array?

Back 19

data type [][] data = new data type[row][column];

Front 20

How to get the length of rows for 2 demensional arrays?

Back 20

data.length gives rows

Front 21

How to get the length of columns for 2 demensional arrays?

Back 21

data [i].length gives count of columns in row i

Front 22

coping array variables what does it do?

Back 22

only copies the pointers to the array object; it does not create a new array.

Front 23

clone methods what does it return and what you have to do?

Back 23

clone method gives a true copy and returns type object, so you need to cast it to the same type as the original array

Front 24

arraycopy method does what?

Back 24

copyies the elements from one array to another

Front 25

concept classes?

Back 25

should represent a single concept from the problem domain

Front 26

actor classes?

Back 26

do some kind of work for you, such as scanner or random classes

Front 27

utiliy classes?

Back 27

contain no objects, but only a set of static methods and constants

Front 28

runnable classes?

Back 28

contain only main methods

Front 29

Static Methods?

Back 29

a method that is not invoked on an object

Front 30

Static Fields

Back 30

belongs to the class, not to an object of the class

Front 31

Static Fields should always be declared as what?

Back 31

Private

Front 32

class instance variables have what scope?

Back 32

class scope

Front 33

local variables declaed within a mehtods have what scope?

Back 33

method scope

Front 34

local variables declaed within a code block have what scope?

Back 34

block scope

Front 35

parameter variables( which are declared in the method header) have what scope

Back 35

method scope

Front 36

when do you use this for scope

Back 36

when you are overlaping scope

Front 37

packages are used for?

Back 37

advoiding class name clashes

Front 38

how tm ospecify if a class belongs to a package?

Back 38

in the first line write

package package-name;

Front 39

how to import all classes?

Back 39

use *like
import package-name.*;

Front 40

how to import JOptionPane class?

Back 40

import javax.swing.JOtionPane;

Front 41

how to import random class?

Back 41

import java.util.random;

Front 42

how to import scanner class?

Back 42

import java.until.Scanner;

Front 43

how to import Arraylist class

Back 43

import java.util.ArrayList<E>;

Front 44

how to import arrays

Back 44

import java.util.arrays;

Front 45

how to import math class?

Back 45

import java.lang.Math;

Front 46

how to import rectangle class?

Back 46

import java.awt.Rectangle;

Front 47

Decaling a method names getData that returns String array?

Back 47

public String[] getData()