java定义一个汽车类，属性包括车牌号、车主、核载人数、自重、车速

以下是一个简单的Java汽车类的实现：

public class Car {
    private String licensePlateNumber;  // 车牌号
    private String owner;  // 车主
    private int capacity;  // 核载人数
    private double weight;  // 自重
    private double speed;  // 车速

    // 构造方法
    public Car(String licensePlateNumber, String owner, int capacity, double weight, double speed) {
        this.licensePlateNumber = licensePlateNumber;
        this.owner = owner;
        this.capacity = capacity;
        this.weight = weight;
        this.speed = speed;
    }

    // getter和setter方法
    public String getLicensePlateNumber() {
        return licensePlateNumber;
    }

    public void setLicensePlateNumber(String licensePlateNumber) {
        this.licensePlateNumber = licensePlateNumber;
    }

    public String getOwner() {
        return owner;
    }

    public void setOwner(String owner) {
        this.owner = owner;
    }

    public int getCapacity() {
        return capacity;
    }

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

    public double getWeight() {
        return weight;
    }

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

    public double getSpeed() {
        return speed;
    }

    public void setSpeed(double speed) {
        this.speed = speed;
    }
}

在上面的代码中，我们定义了一个名为`Car`的类，并声明了该类的五个属性：`licensePlateNumber`（车牌号）、`owner`（车主）、`capacity`（核载人数）、`weight`（自重）和`speed`（车速）。我们还提供了一个构造方法和getter和setter方法来访问这些属性。