面向对象程序设计（课堂源代码留档）
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面向对象程序设计（课堂源代码留档）

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HelloProj1

HelloWorld.java

package com.study.hello;

public class HelloWorld {

    public static void main(String[] args) {
        // TODO Auto-generated method stub
        System.out.println("Hello, Java world.");
    }

}

HelloProj2

HelloWorld2.java

package com.study.hello;

import java.util.Scanner;

public class HelloWorld2 {
    public static String input() {
        Scanner obj = new Scanner(System.in);
        String aName = "";
        try {
            System.out.print("Plese input your name.");
            aName = obj.next();
        } catch(Exception e) {
            aName = "nobody";
        } finally {
            obj.close();
        }
        
        return aName;
    }
    
    public static void output(String pName) {
        System.out.println("Hello,"+pName);
    }
    
    public static void main(String[] args) {
        // TODO Auto-generated method stub
        String myName;
        myName = input();
        output(myName);
    }

}

HelloProj3

Greeting.java

package com.study.hello;

import java.util.Scanner;

public class Greeting {
    private String aName;

    public void input() {
        Scanner obj = new Scanner(System.in);
        try {
            System.out.print("Plese input your name.");
            
//Scanner是一个扫描器，我们录取到键盘的数据，先存到缓存区等待读取，它判断读取结束的标示是  空白符；比如空格，回车，tab 等等。
//next()方法读取到空白符就结束；
//nextLine()读取到回车结束也就是“\r”；
//需要输入带空格的字符串时，用nextLine();            
            aName = obj.nextLine();
        } catch (Exception e) {
            aName = "nobody";
        } finally {
            obj.close();
        }
    }

    public void output() {
        System.out.println("Hello," + aName);
    }
}

HelloWorld3.java

package com.study.hello;

public class HelloWorld3 {

    public static void main(String[] args) {
        // TODO Auto-generated method stub
        Greeting obj = new Greeting();
        obj.input();
        obj.output();
    }

}

ScoresProj

MainClass.java

package com.study.socres;

public class MainClass {

    public static void main(String[] args) {
        // TODO Auto-generated method stub
        ScoreTransfer obj = new ScoreTransfer();
        obj.transfer("E");
    }

}

ScoreTransfer.java

package com.study.socres;

public class ScoreTransfer {
    public void transfer(String pGrade) {
        int score;

        switch (pGrade) {
        case "A":
            score = 95;
            break;
        case "B":
            score = 85;
            break;
        case "C":
            score = 75;
            break;
        case "D":
            score = 65;
            break;
        case "E":
            score = 35;
            break;
        default:
            score = 0;
        }
        System.out.println("The score is " + Integer.toString(score));
    }

    public void transfer(int pScore) {
        String grade;

        if (pScore >= 90 && pScore <= 100) {
            grade = "A";
        } else if (pScore >= 80 && pScore <= 89) {
            grade = "B";
        } else if (pScore >= 70 && pScore <= 79) {
            grade = "C";
        } else if (pScore >= 60 && pScore <= 69) {
            grade = "D";
        } else if (pScore >= 0 && pScore <= 59) {
            grade = "E";
        } else {
            grade = "Error";
        }
        System.out.println("The grade is " + grade);
    }
}

SavingMoney

MainClass.java

package com.study.savingmoney;

public class MainClass {

    public static void main(String[] args) {
        // TODO Auto-generated method stub
        Saver obj = new Saver(200,20,24);
        obj.showResult(false);
    }

}

Saver.java

package com.study.savingmoney;

public class Saver {
    private double initial;
    private double increase;
    private int months;
    private double[] saved;

//    public Saver() {
//        this.initial = 0;
//        this.increase = 0;
//        this.months = 0;
//        this.saved = new double[this.months];
//        this.compute();
//    }

    public Saver(double pInitial, double pIncrease, int pMonths) {
        this.initial = pInitial;
        this.increase = pIncrease;
        this.months = pMonths;
        this.saved = new double[this.months];
        this.compute();
    }

    public void compute() {
        this.saved[0] = this.initial;
        for (int i = 1; i < this.months; i++) {
            this.saved[i] = this.saved[i - 1] + this.increase;
        }
    }

    public void showResult() {
        double total = 0;
        for (double every : saved) {
            System.out.println("Saved: " + every);
            total += every;
        }
        System.out.println("Total saved: " + total);
    }

    public void showResult(boolean withMonthSave) {
        int i = 0;
        double total = 0;

        while (i < this.months) {
            if (withMonthSave) {
                System.out.println("Saved: " + this.saved[i]);
            }
            total += this.saved[i];
            i++;
        }
        System.out.println("Total saved: " + total);
    }
}

FileProj

注意：如果你的“Workspace”是默认路径，那么本节课代码运行后，“MyData.txt”的路径为：C:\Users\用户名\eclipse-workspace\FileProj。

FileOp.java

package com.study.files;

import java.io.BufferedReader;
import java.io.BufferedWriter;
import java.io.FileReader;
import java.io.FileWriter;
import java.io.IOException;
import java.util.ArrayList;

public class FileOp {
    private String fileName;

    public FileOp() {
        super();
        this.fileName = ".\\MyData.txt";
    }

    public FileOp(String fileName) {
        super();
        this.fileName = fileName;
    }

    public void writeFile() {
        String[] companies = { "Intel", "Microsoft", "IBM", "Oracle" };

        try {
            FileWriter fw = new FileWriter(this.fileName);
            BufferedWriter bw = new BufferedWriter(fw);

            for (String line : companies) {
                bw.write(line);
//                bw.write("\n");
                bw.newLine();
            }
            bw.close();
            fw.close();
        } catch (IOException e) {
            e.printStackTrace();
        }
    }

    public void readFile() {
        ArrayList<String> companes = new ArrayList<String>();
        String line;

        try {
            FileReader fr = new FileReader(this.fileName);
            BufferedReader br = new BufferedReader(fr);

            while ((line = br.readLine()) != null) {
                companes.add(line);
                System.out.println(line);
            }
            br.close();
            fr.close();

//            for(String comp : companes) {
//                System.out.println(comp);
//            }

        } catch (IOException e) {
            e.printStackTrace();
        }
    }
}

Main.java

package com.study.files;

public class Main {

    public static void main(String[] args) {
        // TODO Auto-generated method stub
        FileOp obj = new FileOp();
        //下列函数中，`writerFile();` 为写文件函数，`readFile();`为读文件函数。
                //obj.writeFile(); 
                //obj.readFile();
        
    }

}

CarGameProj

(更新时间：2020年10月14日 16：30)

Car.java

package com.study.carGame;

import java.util.Random;

public class Car {
    protected String owner;
    protected String color;
    protected double speed;
    protected int duration;
    protected Tools status;
    
    private static String ClassName = "CarClass";
    private static String Version = "1.0.0";
    
    public static String getClassName() {
        return ClassName;
    }
    public static String getVersion() {
        return Version;
    }
    
    
    // default constructor
    public Car() {
        this.owner = "Rocky";
        this.color = "red";
        this.speed = 0.0;
        this.duration = 100;
        this.status = Tools.NONE;
    }
    // parameter constructor
    public Car(String owner, String color) {
        this.owner = owner;
        this.color = color;
        this.speed = 0.0;
        this.duration = 100;
        this.status = Tools.NONE;
    }
    
    public void show() {
        System.out.println("********** car information **********");
        System.out.println("Owner: " + this.owner);
        System.out.println("Color: " + this.color);
        System.out.println("Speed: " + this.speed);
        System.out.println("Duration: " + this.duration);
        System.out.println("*************************************");
    }
    
    public void speedUp() {
        Random obj = new Random();
        this.speed += obj.nextDouble() * 10;
    }
    
    public void speedDown() {
        Random obj = new Random();
        this.speed -= obj.nextDouble() * 5;
        if (this.speed <= 0.0) {
            this.speed = 0.0;
        }
    }
    
    public void useTool(Tools theTool) {
        if (theTool == Tools.LIFEUP) {
            this.duration = 100;
            this.status = Tools.NONE;
        } else if (theTool == Tools.IRONFIRM) {
            this.status = Tools.IRONFIRM;
        } else if (theTool == Tools.FLASK) {
            this.status = Tools.FLASK;
        }
    }
    public boolean crash() {
        Random obj = new Random();
        int damage = (1+obj.nextInt(10));
        this.computeDamage(damage);
        
        if (this.duration<=0) {
            System.out.println(this.owner + " lost the car.");
            return false;
        } else {
            return true;
        }
    }
    public boolean crash(Tools theTool) {
        if (theTool == Tools.HALFKILL) {
            // check the status
            this.computeDamage(50);
        }
        if (this.duration<=0) {
            System.out.println(this.owner + " lost the car.");
            return false;
        } else {
            return true;
        }
    }
    protected void computeDamage(int damage)  {
        Random obj = new Random();
        int rnd;
        if (this.status == Tools.NONE) {
            this.duration -= damage;
        } else if (this.status == Tools.IRONFIRM) {
            this.duration -= damage/2;
        } else if (this.status == Tools.FLASK) {
            rnd = obj.nextInt(100);
            if (rnd >= 80)  this.duration -= damage;
        }
    }
}

Game.java

package com.study.carGame;

import java.util.Scanner;

public class Game {
    private ArmoredCar obj1;
    private Car obj2;
    
    public void showMenu() {
        @SuppressWarnings("resource")
        Scanner obj = new Scanner(System.in);
        int sel;
        while(true) {
            // Show an operation menu
            System.out.println("------------ Car Game ------------");
            System.out.println("  1 -- Get two new cars");
            System.out.println("  2 -- Speed up");
            System.out.println("  3 -- Speed down");
            System.out.println("  4 -- Crash!");
            System.out.println("  5 -- Half Kill!");
            System.out.println("  6 -- Show class information!");
            System.out.println("  0 -- Exit");
            System.out.println("----------------------------------");
            
            // get a choice
            do {
                System.out.print("Please input your choice: ");
                try {
                    sel = obj.nextInt();
                } catch (Exception e) {
                    sel = -1;
                }
            } while(sel < 0 || sel > 6);
            
            // switch-case for operations
            switch(sel) {
            case 0:
                exitGame();
                break;
            case 1:
                obj1 = new ArmoredCar("Tom", "Grey");  obj1.show();
                obj2 = new Car("Jerry","red");  obj2.show();
                break;
            case 2:
                obj1.speedUp();  obj1.show();
                obj2.speedUp();  obj2.show();
                break;
            case 3:
                obj1.speedDown();  obj1.show();
                obj2.speedDown();  obj2.show();
                break;
            case 4:
                if (obj1.crash())
                    obj1.show();
                else 
                    exitGame();
                if (obj2.crash())
                    obj2.show();
                else
                    exitGame();
                break;
            case 5:
                obj1.useTool(Tools.IRONFIRM);
                obj2.useTool(Tools.FLASK);
                if (obj1.crash(Tools.HALFKILL))
                    obj1.show();
                else 
                    exitGame();
                if (obj2.crash(Tools.HALFKILL))
                    obj2.show();
                else
                    exitGame();
                break;
            case 6:
                System.out.println("Class Name: " + Car.getClassName());
                System.out.println("Version: " + Car.getVersion());
                break;
            }
            
            // system("pause");
            System.out.println("Press Enter to continuee...");
            obj.nextLine();
            obj.nextLine();
        }
    }

    private void exitGame() {
        System.out.println("------------ Bye Bye ------------");
        System.exit(0);
    }
}

MainClass.java

package com.study.carGame;

public class MainClass {

    public static void main(String[] args) {
        // TODO Auto-generated method stub
        Game obj = new Game();
        obj.showMenu();
    }

}

Tools.java

package com.study.carGame;

public enum Tools {
    NONE, LIFEUP, IRONFIRM, FLASK, HALFKILL;
}

Armored.java

package com.study.carGame;

import java.util.Random;

public class ArmoredCar extends Car {
    protected int armorLevel;
    
    private static String ClassName = "ArmoredCar class";
    private static String Version = "1.0.0";
    
    public static String getClassName() {
        return ClassName;
    }

    public static String getVersion() {
        return Version;
    }

    public ArmoredCar() {
        super();
        this.duration = 200;
        this.armorLevel = 10;
        // TODO Auto-generated constructor stub
    }

    public ArmoredCar(String owner, String color) {
        super(owner, color);
        // TODO Auto-generated constructor stub
        this.duration = 200;
        this.armorLevel = 10;
    }
    
    public void incressArmor() {
        this.armorLevel += 10;
    }
    
    public boolean crash() {
        Random obj = new Random();
        int damage = (1+obj.nextInt(10));
        damage = damage - this.armorLevel;
        if (damage<0) damage = 0;
        this.computeDamage(damage);
        
        if (this.duration<=0) {
            System.out.println(this.owner + " lost the car.");
            return false;
        } else {
            return true;
        }
    }
    
    public boolean crash(Tools theTool) {
        int damage = 50;
        if (theTool == Tools.HALFKILL) {
            // check the status
            this.computeDamage(50);
        }
        damage = damage - this.armorLevel;
        if (damage<0) damage = 0;
        this.computeDamage(damage);
        if (this.duration<=0) {
            System.out.println(this.owner + " lost the car.");
            return false;
        } else {
            return true;
        }
    }
}

ShapesProj

Factory.java

package com.study.shapes;

import java.util.Scanner;

public class Factory {
    private final int n = 5;
    Shape[] shapes;

    public Factory() {
        shapes = new Shape[n];
    }

    public void operate() {
        double area,totalArea = 0.0;
        Scanner obj = new Scanner(System.in);
        int sel;

        for (int i = 0; i < n; i++) {
            // 显示菜单
            System.out.println("=========菜单=========");
            System.out.println("1. 正方形");
            System.out.println("2. 三角形");
            System.out.println("=====================");

            // 选择
            do {
                try {
                    System.out.println("你的选择是：");
                    sel = obj.nextInt();
                } catch (Exception e) {
                    sel = -1;
                }
            } while (sel < 1 || sel > 2);
            
            // 生成图形
            switch(sel) {
            case 1:
                shapes[i] = new Square();
                break;
            case 2:
                shapes[i] = new Triangle();
                break;
            }
            
            // 求面积
            area = shapes[i].area();
            System.out.println("图形面积是： "+ area + "\n");
            totalArea += area;
        }
        System.out.println(n + "个图形的总面积是: " + totalArea);
    }
}

MainClass.java

package com.study.shapes;

public class MainClass {

    public static void main(String[] args) {
        // TODO Auto-generated method stub
        Factory obj = new Factory();
        obj.operate();
    }

}

Shape.java

package com.study.shapes;

public abstract class Shape {
    public abstract double area();
}

Square.java

package com.study.shapes;

import java.util.Scanner;

public class Square extends Shape {
    private double side;
    
    public Square() {
        @SuppressWarnings("resource")
        Scanner obj = new Scanner(System.in);
        try {
            System.out.print("请输入正方形的边长：");
            this.side = obj.nextDouble();
        }catch(Exception e) {
            this.side = 1.0;
        }
    }
    @Override
    public double area() {
        // TODO Auto-generated method stub
        return side * side;
    }

}

Triangle.java

package com.study.shapes;

import java.util.Scanner;

public class Triangle extends Shape {
    private double bottom;
    private double height;
    
    public Triangle() {
        @SuppressWarnings("resource")
        Scanner obj = new Scanner(System.in);
        try {
            System.out.print("请输入三角形的底和高：");
            this.bottom = obj.nextDouble();
            this.height = obj.nextDouble();
        }catch(Exception e) {
            this.bottom = 2.0;
            this.height = 1.0;
        }
    }
    @Override
    public double area() {
        // TODO Auto-generated method stub
        return 0.5 * this.bottom * this.height;
    }

}

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