用java编写5个代码1.编写程序，在控制台中输出9*9乘法表。 2.定义一个用于存放班级分数的数组，长度为10，任意输入10个分数，求出班级的总分数 3. 设计一个Football类，拥有材质，直径，品牌，重量，生产日期，销售日期等属性；对各个属性的setter方法和getter方法。写出对应Java代码。 4. 设计一个抽象类Apple类，拥有重量，品种，单价，产地，采摘日期，销售日期等属性；一个抽象方法：计算运费。写出对应Java代码。 5. 分析以下需求，并用代码实现。描述笔记本类，实现笔记本使用USB鼠标。(1)定义USB接口:开启功能，关闭功能。(2)定义笔记本类:具备开机功能，关机功能，具备使用USB设备的功能。(3)定义鼠标类:要符合USB接口。(4) 定义测试类:创建电脑对象,依次调用开机方法,使用USB设备, 关机方法。 程序运行打印效果如下:开机 连接鼠标的USB 断开鼠标的USB 关机。

1. 输出9*9乘法表的Java代码：

public class MultiplicationTable {
    public static void main(String[] args) {
        for (int i = 1; i <= 9; i++) {
            for (int j = 1; j <= i; j++) {
                System.out.print(j + "*" + i + "=" + i * j + "\t");
            }
            System.out.println();
        }
    }
}

2. 计算班级总分数的Java代码：

import java.util.Scanner;

public class ClassScores {
    public static void main(String[] args) {
        int[] scores = new int[10];
        int totalScore = 0;
        Scanner scanner = new Scanner(System.in);
        for (int i = 0; i < 10; i++) {
            System.out.print("请输入第" + (i + 1) + "个学生的分数：");
            scores[i] = scanner.nextInt();
            totalScore += scores[i];
        }
        System.out.println("班级总分数为：" + totalScore);
    }
}

3. Football类的Java代码：

import java.util.Date;

public class Football {
    private String material;
    private int diameter;
    private String brand;
    private double weight;
    private Date productionDate;
    private Date saleDate;
    
    public String getMaterial() {
        return material;
    }

    public void setMaterial(String material) {
        this.material = material;
    }

    public int getDiameter() {
        return diameter;
    }

    public void setDiameter(int diameter) {
        this.diameter = diameter;
    }

    public String getBrand() {
        return brand;
    }

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

    public double getWeight() {
        return weight;
    }

    public void setWeight(double weight) {
        this.weight = weight;
    }

    public Date getProductionDate() {
        return productionDate;
    }

    public void setProductionDate(Date productionDate) {
        this.productionDate = productionDate;
    }

    public Date getSaleDate() {
        return saleDate;
    }

    public void setSaleDate(Date saleDate) {
        this.saleDate = saleDate;
    }
}

4. Apple抽象类的Java代码：

import java.util.Date;

public abstract class Apple {
    private double weight;
    private String variety;
    private double unitPrice;
    private String origin;
    private Date pickDate;
    private Date saleDate;
    
    public abstract double calculateFreight();
    
    public double getWeight() {
        return weight;
    }

    public void setWeight(double weight) {
        this.weight = weight;
    }

    public String getVariety() {
        return variety;
    }

    public void setVariety(String variety) {
        this.variety = variety;
    }

    public double getUnitPrice() {
        return unitPrice;
    }

    public void setUnitPrice(double unitPrice) {
        this.unitPrice = unitPrice;
    }

    public String getOrigin() {
        return origin;
    }

    public void setOrigin(String origin) {
        this.origin = origin;
    }

    public Date getPickDate() {
        return pickDate;
    }

    public void setPickDate(Date pickDate) {
        this.pickDate = pickDate;
    }

    public Date getSaleDate() {
        return saleDate;
    }

    public void setSaleDate(Date saleDate) {
        this.saleDate = saleDate;
    }
}

5. 笔记本类与鼠标类的Java代码：

interface USB {
    void turnOn();
    void turnOff();
}

class Laptop implements USB {
    public void turnOn() {
        System.out.println("开机");
    }
    
    public void turnOff() {
        System.out.println("关机");
    }
    
    public void connectUSB(USB usb) {
        System.out.println("连接" + usb.getClass().getSimpleName() + "的USB");
    }
    
    public void disconnectUSB(USB usb) {
        System.out.println("断开" + usb.getClass().getSimpleName() + "的USB");
    }
}

class Mouse implements USB {
    public void turnOn() {
        System.out.println("鼠标开启功能");
    }
    
    public void turnOff() {
        System.out.println("鼠标关闭功能");
    }
}

public class Test {
    public static void main(String[] args) {
        Laptop laptop = new Laptop();
        Mouse mouse = new Mouse();
        laptop.turnOn();
        laptop.connectUSB(mouse);
        laptop.disconnectUSB(mouse);
        laptop.turnOff();
    }
}