public class Person {
  private int age;
  private String name;

  public Person() {
    System.out.println("person run");
  }

  public Person(String name, int age) {
    this.age = age;
    this.name = name;
    System.out.println("Person param run..." + this.name + ":" + this.age);
  }

  public void showInfo() {
    System.out.println(this.name + "......" + this.age);
  }
}

public class GetClassFile {
  public static void main(String[] args) throws ClassNotFoundException {
    getClassObject_3();
  }

  /**
   * 通過給定的類的字符串名稱就可以獲取該類的字節碼文件，更利于擴展
   * 可以用Class類中的"forName()"方法來完成
   */
  public static void getClassObject_3() throws ClassNotFoundException {
  // 包名一定要寫全，否則會報"java.lang.ClassNotFoundException"異常
    String className = "src.Person"; 
    Class clazz = Class.forName(className);
    System.out.println(clazz);
  }

  /**
   * 任何數據類型都具備一個靜態屬性
   * 通過".class"來獲取對應的Class對象
   * 擴展性較差
   */
  public static void getClassObject_2() {
    Class clazz = Person.class;
    Class clazz1 = Person.class;
    System.out.println(clazz == clazz1);
  }

  /**
   * 運用Object類中的getClass方法
   * 用這個方法時，必須明確具體的類，并創建對象
   * 比較麻煩
   */
  public static void getClassObject_1() {
    Person p = new Person();
    Class clazz = p.getClass();
    Person p1 = new Person();
    Class clazz1 = p1.getClass();
    System.out.println(clazz == clazz1);
  }
}