User:Valerie Hagen

From ggc

Notes

Study Guide - Test 1

1. Study Tutorial/Program Structure page under javawide or wiki a. Study terms b. Key words (change color or always lower case) public, void, key words relate to identifiers - exclusive - i. Name of special meaning in program ii. One word iii. Need to know: void; private; import; class c. Identifiers (all names programmers choose - name of the variables)- string; sprite; makeSprites; startGame; addSprites d. Class declaration + class body = class definition i. Same with method and variable e. Method declaration – parenthesis; void – following method declaration there is an {. i. Method definition goes outside the method body ii. Unit called method definition iii. Method name iv. One word 1. ex. advanceFrame 2. Class names – always capitalized a. Example: ProgramSturcture

f. Method Bodies i. Call or invoke method – always has parenthesis 1. Ex: Canvas.addSprite(square);

g. Variable declaration – type followed by variable name i. ex: private Sprite oval; ii. Naming a Variable- all lowercase 1. example: oval

Side Notes:

       Access Specifier (modifier) outside the class - public
       Non "    "     - private

• Conventions - naming (depends on what u name it - Capitalized -- always • Method naming - lower case then Capital letter makeSprites • Variable-lower case Upper case • Spacing convention - indent after brace, brace on one line by itself, statements go on line by themselves. • */ -- Comments; end with -- *\ • If your parenthesis do not match up, brackets don’t match up, quotes, = a problem etc. • Parameter list - in between parenthesis • Field declation - ex: private Sprite oval;

       Debugging- program compiles but doesnt do what u want it to do; "fix the bug"

RUN TIME ERRORS: screen jumps in half -- nol pointer acception - try to use a variabel before you initialize it • Spacing Convention – indent after brackets only put braces on line by itself. o Example: public void startGame;

                                 {
                                       makeSprites();
                                       addSprites();
                                 }

b4 use variable - declare it then initialize it with in the method body then call it

give a starting value until you use it - n something literal - assignment identifier declaring a method conditional execution ... where the player clicks != null (doesnt exsist) new= calling a constructer 1 package Jam;

2 import fang.*;

3 /**

4 * All about my class here.

5 * @author Jam Jenkins

6 */

7 public class HelloGame extends GameLoop

8 {

9 private Sprite hello;

10

11 public void startGame()

12 {

13 hello=new StringSprite("Hello World");

14 hello.setLocation(0.5, 0.5);

15 canvas.addSprite(hello);

16 }

17 public HelloGame()

18 {

19

20 }

21 }

22

Main definitions:

Identifier- name given by the game (can’t have spaces) *Names cant have spaces also* When you call a method you have parentheses String- sequence of characters

Unit - public class HelloGame extends GameLoop- Class declaration Hellogame- name of the program Extends- everything from basic game and more. Public- everyone can view GameLoop- the game loops

Ex. Field - private Sprite hello; Private- only some can see Sprite- object Hello- identifier outside the name block people cant see.

2 methods: public void startGame()- start of a method Identify method always followed by a code block

Method Body: hello=new StringSprite("Hello World"); 14 hello.setLocation(0.5, 0.5); Location of opject 15 canvas.addSprite(hello);

int (declare) x=5 (initialize); if (x==5) (comparison - determining if x is 5) {