java创建一个饮料类，其中包含私有属性名称、价格和容量，然 后创建方法去访问和修改这些属性的测试类

下面是Java代码实现：

public class Beverage {
    private String name;
    private double price;
    private double capacity;

    public Beverage(String name, double price, double capacity) {
        this.name = name;
        this.price = price;
        this.capacity = capacity;
    }

    public String getName() {
        return name;
    }

    public double getPrice() {
        return price;
    }

    public double getCapacity() {
        return capacity;
    }

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

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

    public void setCapacity(double capacity) {
        this.capacity = capacity;
    }
}

测试类：

public class BeverageTest {
    public static void main(String[] args) {
        Beverage beverage = new Beverage("可乐", 3.0, 500.0);
        System.out.println(beverage.getName() + " " + beverage.getPrice() + "元 " + beverage.getCapacity() + "毫升");
        beverage.setName("雪碧");
        beverage.setPrice(3.5);
        beverage.setCapacity(600.0);
        System.out.println(beverage.getName() + " " + beverage.getPrice() + "元 " + beverage.getCapacity() + "毫升");
    }
}

输出结果：

可乐 3.0元 500.0毫升
雪碧 3.5元 600.0毫升