java之面向对象练习

1，题目大概：

import java.util.Random;
public class testRole1 {
    public static void main(String[] args) {
        Role r1 = new Role("小明",10,'男');
        Role r2 = new Role("小刚",6,'男');
        while(true) {
            r1.attack(r2);
            if(r2.getBlood()==0){
                System.out.println(r1.getName()+"K.O"+r2.getName());
                break;
            }
            r2.attack(r1);
            if(r1.getBlood()==0){
                System.out.println(r2.getName()+"K.O"+r1.getName());
                break;
            }
        }
    }
}

public class Role {
    private String name;
    private int blood;
    private char gender;
    private String face;
    String[] attack_desc = {"%s使出降龙十八掌，一掌打去 %s","%s使出九阴白骨爪，打向%s"};
    String[] boyFace = {"玉树临风","丑八怪"};
    String[] girlFace = {"美若天仙","相貌平平"};
    public Role() {
    }
    public Role(String name,int blood,char gender){
        this.name = name;
        this.blood = blood;
        this.gender = gender;
    }
    public char getGender() {
        return gender;
    }

    public void setGender(char gender) {
        this.gender = gender;
    }

    public String getFace() {
        return face;
    }

    public void setFace(String face) {
        Random r = new Random();
        if(getGender()=='女')
        {
            int index = r.nextInt(boyFace.length);//这样的程序可变性高
            this.face = girlFace[index];
        } else if (getGender()=='男') {
            int index = r.nextInt(girlFace.length);
            this.face = girlFace[index];
        }

    }
    public void setName(String name){
        this.name = name;
    }
    public String getName(){
        return name;
    }
    public void setBlood(int blood){
        this.blood = blood;
    }
   public int getBlood(){
        return blood;
   }

   public void attack(Role role){
       Random r =  new Random();
       int hurt  = r.nextInt(20)+1;
       int remainBlood = role.blood-hurt;
       remainBlood = (remainBlood>0)?remainBlood:0;//血量剩余
       role.setBlood(remainBlood);//这里要把原来的血量给重新赋回，否则blood一直是原来的值，最后造成在test测试类中一直循环
       int index = r.nextInt(attack_desc.length);
       String kungFu = attack_desc[index];
       System.out.printf(kungFu,this.getName(),role.getName());

       System.out.println(this.getName()+"打了"+role.getName()+"一拳，"+role.getName()+"造成了"+ hurt+"伤害，" +
               role.getName()+"还剩"+remainBlood+"血");
   }
}

2，

public class goodsTest {
    public static void main(String[] args) {
        goods[] Goods = new goods[3];
        goods g1 = new goods(1,"huawei",555.2,48);
        goods g2 = new goods(2,"apple",5556.2,45);
        goods g3 = new goods(3,"xioami",156.3,45);
        Goods[0] = g1;
        Goods[1] = g2;
        Goods[2] = g3;
        for (int i = 0; i < Goods.length  ; i++) {
            goods good = Goods[i];//用good来接受数组Goods遍历的每一元素
            System.out.println(good.getId()+","+good.getName()+","+good.getPrice()+","+good.getNum());

        }
    }
}

public class goods {
    private  int id;
    private  String name;
    private double price;
    private int num;

    public goods() {
    }

    public goods(int id, String name, double price, int num) {
        this.id = id;
        this.name = name;
        this.price = price;
        this.num = num;
    }

    public int getId() {
        return id;
    }

    public void setId(int id) {
        this.id = id;
    }

    public String getName() {
        return name;
    }

    public void setName(String name) {
        this.name = name;
    }

    public double getPrice() {
        return price;
    }

    public void setPrice(double price) {
        this.price = price;
    }

    public int getNum() {
        return num;
    }

    public void setNum(int num) {
        this.num = num;
    }
}

3，

import java.util.Scanner;

public class carTest {
    public static void main(String[] args) {
        car[] Car = new car[3];
        Scanner sc = new Scanner(System.in);
        for (int i = 0; i < Car.length ; i++) {
            car c = new car();//注意这里的new car(),它要放在循环里，不能放在for循环外,否则打印的数全部一样
            System.out.println("please input brand");
            String brand = sc.next();
            c.setBrand(brand);
            System.out.println("please input price");
            int price = sc.nextInt() ;
            c.setPrice(price);
            System.out.println("please input color");
            String color = sc.next();
            c.setColor(color);
            Car[i] = c;//这里要把c接到的信息存入数组中！
        }
        for (int i = 0; i < Car.length ; i++) {
            car s = Car[i];
            System.out.println(s.getBrand()+s.getPrice() +s.getColor() );
        }
    }
}

public class car {
    private String brand;
    private int price;
    private String color;

    public car() {
    }

    public car(String brand, int price, String color) {
        this.brand = brand;
        this.price = price;
        this.color = color;
    }

    public String getBrand() {
        return brand;
    }

    public void setBrand(String brand) {
        this.brand = brand;
    }

    public int getPrice() {
        return price;
    }

    public void setPrice(int price) {
        this.price = price;
    }

    public String getColor() {
        return color;
    }

    public void setColor(String color) {
        this.color = color;
    }
}

4，

public class phoneTest {
    public static void main(String[] args) {
        phone[] p = new phone[3];
        double avg;
        int sum = 0;
        phone p1 = new phone("huawei",2322,"green");
        phone p2 = new phone("xiaomi",8555,"red");
        phone p3 = new phone("sanxing",2822,"pink");
        p[0] = p1;
        p[1] = p2;
        p[2] = p3;
        for (int i = 0; i < p.length; i++) {
            phone temp = p[i];
            sum+= temp.getPrice();
        }
        avg = sum *1.0/p.length;//这里为了得到小数，sum注意要乘以1.0
        System.out.println(avg);

    }
}

public class phone {
    private String brand;
    private int price;
    private String color;

    public phone() {
    }

    public phone(String brand, int price, String color) {
        this.brand = brand;
        this.price = price;
        this.color = color;
    }

    public String getBrand() {
        return brand;
    }

    public void setBrand(String brand) {
        this.brand = brand;
    }

    public int getPrice() {
        return price;
    }

    public void setPrice(int price) {
        this.price = price;
    }

    public String getColor() {
        return color;
    }

    public void setColor(String color) {
        this.color = color;
    }

}