Learn Java with teacher Wang three major characteristics (a): Case Quickhit: Demand analysis

Project case: Quickhit: Demand Analysis Instructor: Wang Shaohua QQ Group No.:483773664Learning Goals

Learning to use object-oriented thinking to carry out demand analysis

First, the demand

1. Divides players into different levels based on the input rate and the correct rate

2. The higher the level, the more characters are displayed at one time, and the higher the player's score is to enter it correctly.

3. To complete the specified number of times within the specified time input, the correct rate to meet the requirements, the upgrade

4. Player's highest level is 6, initial level is all 1 levels

5. User error input once, game over

Ii. Object-oriented analysis (i) Discovery class

1. Players (player) class

2. Games (game) class

3. Level class

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(ii) Discovery of the properties of the class
1. Properties of Player Class (player)

• Player current level number (Levelno)

• Player Current level credits (Currscore)

• Current level start time (startTime)

• Current level used time (ElapsedTime)

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2,Properties for level classes (levels)

• Alias at all levels (Levelno)

• The length of the output string at each level (Strlength)

• Number of output strings at each level (Strtimes)

• Time limit for levels (TIMELIMIT)

• All levels correctly enter the score once (Perscore)

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3. Game Class

No attributes, only methods

(iii) Discovery of class behavior 1, Player Class (player)

Play games: Play ()

2. Game Class

• String Printstr (): Output string, return string for comparison with player input

• void Printresult (String out,string in): Compare game output out and player input in, output corresponding information according to comparison results

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(d) Optimization design 1 modifying game classes (games), adding attributes

Player: Player

2 Adding class Levelparam: For storing level constants

Public final static level level[6]

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Three, the game demo demonstration Four, the class writing
(i) Player

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public class Player {    private int levelNo; // 级别号    private int curScore; // 当前积分    private long startTime = 0; // 各级别开始时间    private int elapsedTime; // 各级别已用时间        /**     * 玩家玩游戏。     */    public void play() {             }}

(ii) level

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public class Level {    private int levelNo; // 级别号    private int strLength; // 各级别一次输出字符串的长度    private int strTime; // 各级别输出字符串的次数    private int timeLimit; // 各级别闯关的时间限制    private int perScore; // 各级别成功输入一次字符串后增加的分值    /**     * 构造方法     */    public Level(){}    public Level(int levelNo, int strLength, int strTime, int timeLimit,            int perScore) {        this.levelNo = levelNo;        this.strLength = strLength;        this.strTime = strTime;        this.timeLimit = timeLimit;        this.perScore = perScore;    }}

(iii) Game

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public class Game {    private Player player;// 玩家    /**     * 构造方法     */    public Game(){}    public Game(Player player) {        this.player = player;    }    /**     * 输出指定级别规定长度的字符串。     * @return 输出的字符串，用于和用户输入比较     */    public String printStr() {        return "";    }    /**     * 判断玩家输入是否正确，并输出相应结果信息。     * @param out 游戏输出的字符串     * @param in 玩家输入的字符串     */    public void printResult(String out, String in) {            }}

(d) Levelparam

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/** *  * @author wangsh * @createDate:2016年4月18日 * 功能描述： 级别参数类，配置各个级别参数。 */public class LevelParam {    public final static Level levels[]=new Level[6];//对应六个级别   }

Five, the initialization of the parameters at all levels (a), difficult tips
1 using static modifier properties and code blocks

• static property

belong to this class all

Accessed by the object name. static property name, class name, static property name.

• static method

Access by "class name. Static method Name" and "Object name. Static method Name"

• Static code block

The primary function is to initialize the static property

Executes a class when it is loaded and is executed only once

(b), reference code

Learn Java with teacher Wang three major characteristics (a): Case Quickhit: Demand analysis