Java/com/study/demo3/Vehicle.java

package com.study.demo3;

public class Vehicle {
  protected String name;

  public Vehicle(String name) {
    this.name = name;
  }

  public Vehicle() {
    this.name = "Unknown Vehicle";
  }

  public void start() {
    System.out.println("Vehicle Start");
  }

  public void stop() {
    System.out.println("Vehicle Stop");
  }
}