testnewcar.java

来自「java 完全探索的随书源码」· Java 代码 · 共 25 行

import java.lang.reflect.Constructor;

public class TestNewCar{
  public static void main(String args[]) {
    try {
      Class car = Class.forName("NewCar");

      // create the array of parameter types and find the constructor
      Class param[] = {int.class};
      Constructor con = car.getDeclaredConstructor(param);

      // use a wrapper class to hold the int argument 4
      Object values[] = {new Integer(4)};

      // create an instance of the class
      NewCar carObj = (NewCar)con.newInstance(values);
      System.out.println("The car has " + carObj.getTireCount() + " tires");
    }
    catch (Exception e){
      System.out.println("Something went wrong while instantiating NewCar");
      e.printStackTrace(System.err);
    }
  }
}