35、作业

╰+攻爆jí腚メ 2024-03-31 08:23 73阅读 0赞

1、![6db03e36fe7d4483a9ce932b53094055.png][]

//我的代码：

package Homework_;
    
    public class TestFrock {
        public static void main(String[] args) {
            Frock f1=new Frock();
            Frock f2=new Frock();
            Frock f3=new Frock();
            System.out.println("f1的序列号="+f1.toString()
                    +" \nf2的序列号="+f2.toString()+" \nf3的序列号="+f3.toString());
        }
    }
    //输出：
    // f1的序列号=Frock{seralNumber=100100} 
    // f2的序列号=Frock{seralNumber=100200} 
    // f3的序列号=Frock{seralNumber=100300}

package Homework_;
    
    public class Frock {
        private static int currentNum=100000;
        private int seralNumber;
        public int getNextNum(){
            currentNum+=100;
            return currentNum;
        }
        @Override
        public String toString() {
            return "Frock{" +
                    "seralNumber=" + seralNumber +
                    '}';
        }
        public Frock() {
            this.seralNumber = getNextNum();
    
        }
    }

//老师的代码：

class Frock {
        private static int currentNum=100000;
        private int seralNumber;
        public static int getNextNum(){
            currentNum+=100;
            return currentNum;
        }
    
        public int getSeralNumber() {
            return seralNumber;
        }
    
        public void setSeralNumber(int seralNumber) {
            this.seralNumber = seralNumber;
        }
    
        public Frock() {
            seralNumber = getNextNum();
    
        }
    }
    class TestFrock {
        public static void main(String[] args) {
            System.out.println(Frock.getNextNum());//100100
            System.out.println(Frock.getNextNum());//100200
            Frock f1=new Frock();
            Frock f2=new Frock();
            Frock f3=new Frock();
            System.out.println(f1.getSeralNumber());//100300
            System.out.println(f2.getSeralNumber());//100400
            System.out.println(f3.getSeralNumber());//100500
        }
    }

2、![71cfbc0e3c6e414aac17b71dd4408e73.png][]

//我的代码：

package Homework_;
    public class Homework01 {
        public static void main(String[] args) {
            Animal cat=new Cat();
            cat.shout();
            Animal dog=new Dog();
            dog.shout();
        }
    }
    abstract class Animal{
        void shout(){}
    }
    class Cat extends Animal{
        public void shout(){
            System.out.println("猫会喵喵叫");
        }
    }
    class Dog extends Animal{
        public void shout(){
            System.out.println("狗会汪汪叫");
        }
    }
    //写错了，抽象类里的那个不是抽象方法

//老师的代码：

package Homework_;
    public class Homework01 {
        public static void main(String[] args) {
            Animal cat=new Cat();
            cat.shout();
            Animal dog=new Dog();
            dog.shout();
        }
    }
    abstract class Animal{
        public abstract void shout();
    }
    class Cat extends Animal{
    
        @Override
        public void shout() {
            System.out.println("猫会喵喵叫");
        }
    }
    class Dog extends Animal{
    
        @Override
        public void shout() {
            System.out.println("狗会汪汪叫");
        }
    }

3、![3730524a99824dc98b63e784b21ba76a.png][]

//我的代码：

package Homework_;
    public class Homework01 {
        public static void main(String[] args) {
            Cellphone cellphone=new Cellphone();
            cellphone.testWork();
        }
    }
    interface computer{
        public void work();
    }
    class Cellphone{
    
        public void testWork(){
            computer cellphone=new computer() {
                @Override
                public void work() {
                    System.out.println("运算");
                }
            };
            cellphone.work();
        }
    
    }

//老师的代码：

package Homework_;
    public class Homework01 {
        public static void main(String[] args) {
            Cellphone cellphone=new Cellphone();
            cellphone.testWork(new ICalculate() {
                @Override
                public double work(double n1, double n2) {
                    return n1+n2;
                }
            },10,8);
            Cellphone cellphone1=new Cellphone();
            cellphone.testWork(new ICalculate() {
                @Override
                public double work(double n1, double n2) {
                    return n1*n2;
                }
            },10,8);
        }
    }
    interface ICalculate{
        public double work(double n1,double n2);
    }
    class Cellphone{
        //当我们调用testWork方法时，直接传入一个实现了ICalculate接口的匿名内部类即可
        //该匿名内部类，可以灵活地实现work，完成不同的计算任务
        public void testWork(ICalculate iCalculate,double n1, double n2){
            double result=iCalculate.work(n1,n2);
            System.out.println("计算的结果是="+result);
        }
    }
    //输出：
    //计算的结果是=18.0
    //计算的结果是=80.0
    
    //总结：匿名内部类可以很灵活地修改计算方法需求，所以干脆把计算需求当作参数传入

4、![fe09615b20dc4762a7f6a1e7597d2c50.png][]

//我的代码：

package Homework_;
    
    public class Homework05 {
        public static void main(String[] args) {
            A a=new A("tom");
            a.test();
        }
    }
    class A{
        private String name;
    
        public A(String name) {
            this.name = name;
        }
    
        public String getName() {
            return name;
        }
    
        public void setName(String name) {
            this.name = name;
        }
    
        public void test(){
            class B{
                private String NAME="jack";
                public void show(){
                    System.out.println(NAME);
                    System.out.println(A.this.name);
                }
            }
            B b=new B();
            b.show();
        }
    }
    //输出：
    //jack
    //tom

//老师的代码：把A的属性name写成常量

5、![419f011040174adfa4a5e2775794becb.png][]

package Homework_;
    public class Homework06 {
        public static void main(String[] args) {
            Person person=new Person("唐僧",new Horse());
            person.common();
            person.passRiver();
            person.fire();
            person.common();
        }
    }
    class VehiclesFactory{
        private static Horse horse=new Horse();//饿汉式,唐僧使用的一直是同一匹马
        private VehiclesFactory(){}//构造器私有化
        public static Horse getHorse(){
            return horse;
        }
        public static Boat getBoat(){
            return new Boat();
        }
        public static Plane getPlane(){
            return new Plane();
        }
    }
    interface Vehicles{
        void work();
    }
    class Horse implements Vehicles{
        @Override
        public void work(){
            System.out.println("一般情况下使用马儿前进...");
        }
    }
    class Boat implements Vehicles{
        @Override
        public void work() {
            System.out.println("过河时使用小船...");
        }
    }
    class Plane implements Vehicles{
        @Override
        public void work() {
            System.out.println("过火焰山使用飞机...");
        }
    }
    class Person{
        private String name;
        private Vehicles vehicles;
        //在创建人对对象时,事先给他分配一个交通工具,还得不要浪费这个交通工具
        public Person(String name, Vehicles vehicles) {
            this.name = name;
            this.vehicles = vehicles;
        }
    
        //把具体的要求封装成方法
        public void passRiver(){
            //只有当前对象不是船时(为null或为马),才会得到一艘船
            if(!(vehicles instanceof Boat)) {
                vehicles= VehiclesFactory.getBoat();
            }
            vehicles.work();
        }
        public void common(){
            //只有当前对象不是马时(为null或为船),才会得到一匹马
            if(!(vehicles instanceof Horse)) {
                vehicles= VehiclesFactory.getHorse();
            }
            vehicles.work();
        }
        public void fire(){
            if(!(vehicles instanceof Plane)){
                vehicles= VehiclesFactory.getPlane();
            }
            vehicles.work();
        }
    }
    //输出:
    //一般情况下使用马儿前进...
    //过河时使用小船...
    //过火焰山使用飞机...
    //一般情况下使用马儿前进...
    
    //增加一个飞机,代码很容易扩展

6,![5f9473cbe70c4236967f7eaf1a5f51f6.png][]

//我的代码：

package Homework_;
    public class Homework07 {
        public static void main(String[] args) {
            Car car=new Car(41);
            car.test();
        }
    }
    class Car{
        private int temperature;
        public Car(int temperature) {
            this.temperature = temperature;
        }
        public void test(){
            class Air{//局部内部类
                public void flow(){
                    if(temperature>40){
                        System.out.println("吹冷风");
                    }else if(temperature<0){
                        System.out.println("吹暖气");
                    }else{
                        System.out.println("关空调");
                    }
                }
            }
            Air air=new Air();
            air.flow();
        }
    }
    //输出:吹冷气

//老师的代码：

package Homework_;
    public class Homework07 {
        public static void main(String[] args) {
            Car car=new Car(41);
            car.getAir().flow();
        }
    }
    class Car{
        private double temperature;
    
        public Car(double temperature) {//成员内部类
            this.temperature = temperature;
        }
    
        class Air{
            public void flow(){
                if(temperature>40){
                    System.out.println("吹冷气");
                }else if(temperature<0){
                    System.out.println("吹暖气");
                }else{
                    System.out.println("关闭空调");
                }
            }
        }
        public Air getAir(){//返回一个Air对象
            return new Air();
        }
    }
    //输出:吹冷气

7,![8fb7fbf693f54a9792a39af0a15473ee.png][]

//我的代码：

package Homework_;
    
    public class Homework08 {
        public static void main(String[] args) {
            Color color=Color.YELLOW;
            System.out.println(color+":");
            color.show();
        }
    }
    enum Color implements color_{
        RED(255,0,0),BLUE(0,0,255),
        BLACK(0,0,0),YELLOW(255,255,0),
        GREEN(0,255,0);
        private double redValue;
        private double greenValue;
        private double blueValue;
        private Color(double redValue, double greenValue, double blueValue) {
            this.redValue = redValue;
            this.greenValue = greenValue;
            this.blueValue = blueValue;
        }
        public double getRedValue() {
            return redValue;
        }
        public double getGreenValue() {
            return greenValue;
        }
        public double getBlueValue() {
            return blueValue;
        }
    
        @Override
        public void show() {
            System.out.println("redValue:"+getRedValue()+" greenValue:"+getGreenValue()
                    +" blueValue:"+getBlueValue());
        }
    }
    interface color_{
        void show();
    }
    //输出:
    // YELLOW:
    // redValue:255.0 greenValue:255.0 blueValue:0.0

//老师的代码：

package Homework_;
    
    public class Homework08 {
        public static void main(String[] args) {
            Color color=Color.YELLOW;//改变YELLOW匹配switch使用
            color.show();
            //switch()中放入枚举对象
            //在每个case后,直接写上枚举类中定义的枚举对象即可
            switch (color){
                case RED :
                    System.out.println("匹配到红色");
                    break;
                case YELLOW:
                    System.out.println("匹配到黄色");
                    break;
                //后面的自己写
            }
        }
    }
    enum Color implements IMyInterface{
        RED(255,0,0),BLUE(0,0,255),
        BLACK(0,0,0),YELLOW(255,255,0),
        GREEN(0,255,0);
        private int redValue;
        private int greenValue;
        private int blueValue;
        private Color(int redValue, int greenValue, int blueValue) {
            this.redValue = redValue;
            this.greenValue = greenValue;
            this.blueValue = blueValue;
        }
        public int getRedValue() {
            return redValue;
        }
        public int getGreenValue() {
            return greenValue;
        }
        public int getBlueValue() {
            return blueValue;
        }
    
        @Override
        public void show() {
            System.out.println("属性值为"+getRedValue()+","+getGreenValue()+","+getBlueValue());
        }
    }
    interface IMyInterface{
        void show();
    }
    //输出:
    //属性值为255,255,0
    //匹配到黄色

[6db03e36fe7d4483a9ce932b53094055.png]: https://image.dandelioncloud.cn/pgy_files/images/2024/03/31/1240801c5076477bb4dca5ee21d1ef41.png
[71cfbc0e3c6e414aac17b71dd4408e73.png]: https://image.dandelioncloud.cn/pgy_files/images/2024/03/31/adbd0c781eac440980e4b6f64e4f735c.png
[3730524a99824dc98b63e784b21ba76a.png]: https://image.dandelioncloud.cn/pgy_files/images/2024/03/31/c02a16d4fa9841dd8ed68809633975b3.png
[fe09615b20dc4762a7f6a1e7597d2c50.png]: https://image.dandelioncloud.cn/pgy_files/images/2024/03/31/c5453796cbb24e35883f885f688a9833.png
[419f011040174adfa4a5e2775794becb.png]: https://image.dandelioncloud.cn/pgy_files/images/2024/03/31/8e363bdc3f2643a19774491016a6738c.png
[5f9473cbe70c4236967f7eaf1a5f51f6.png]: https://image.dandelioncloud.cn/pgy_files/images/2024/03/31/1befc57b86a240bcb0bbbb99da6566bb.png
[8fb7fbf693f54a9792a39af0a15473ee.png]: https://image.dandelioncloud.cn/pgy_files/images/2024/03/31/aceb87d0286a492c9293def55d0f71df.png