java一个类里面写两个类

Question

编写一个 java 应用程序，该程序中有两个类Vehicle(用于描述机动
车），一个主类User，其中 Vehicle 的speed 属性用于描述速度,power用于描述功率，setSpeed 方法用于设定机动车的速度值，setPower
用于设定机动车的功率，getSpeed 和 getPower 用于获取机动车的速度和功率，speedUp 和 speedDown 方法用于描述机动车的加速和减速情况。
Vehicle
speed: double
power: int
setSpeed (double): void
getSpeed (): double
speedUp (int): void
speedDown (int): void
setPower (int):
void
getPower (): int

Answer 1

public class Test {
    
    public static class Vehicle{
        
        private double speed;
        private int power;

        public double getSpeed() {
            return speed;
        }

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

        public int getPower() {
            return power;
        }

        public void setPower(int power) {
            this.power = power;
        }
        
        public void speedUp(double speedUp) {
            this.speed = speedUp;
        }

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

    public static class User{

    }
}