JAva反射メカニズムの詳細とインスタンスコード

JAva反射メカニズム:
エンティティクラスのテスト
ヒューマンを例に

/**
 * Project: Day12_for_lxy
 * Created: Lulu
 * Date: 2016/8/10
 */
public class Human {
  private String name;
  private int age;
  private float height;

  private static int legs = 2;
  private Map jobs;
  private T t;

  public int say() {
    System.out.println("I'm" + name);
    return 0;
  }
  private void sleep(Human human) {
    System.out.println(name + " sleep with " + human.name);
  }
  public List getList() {
    return new ArrayList<>();
  }
  public Human() {
  }
  private Human(String name, int age, float height) {
    this.name = name;
    this.age = age;
    this.height = height;
  }
  public String getName() {
    return name;
  }
  public void setName(String name) {
    this.name = name;
  }
  public int getAge() {
    return age;
  }
  public void setAge(int age) {
    if (age > 150 || age < 0) {
      throw new RuntimeException("age > 150 || age < 0");
    }
    this.age = age;
  }
  public float getHeight() {
    return height;
  }
  public void setHeight(float height) {
    this.height = height;
  }
  @Override
  public String toString() {
    return "Human{" +
        "name='" + name + '\'' +
        ", age=" + age +
        ", height=" + height +
        '}';
  }
}

構築方法のテスト

/**
 * Project: Day12_for_lxy
 * Created: Lulu
 * Date: 2016/8/10
 */
/*
      
 */
public class TestConstructor {
  public static void main(String[] args) {
    //        ,       Human     
    Class humanClass = Human.class;
    try {
////                     
//      //            ,        (public)
//      Constructor constructor1 = humanClass.getConstructor(String.class, Integer.TYPE, Float.TYPE);
//
//      Human h1 = constructor1.newInstance("  ", 18, 1.85f);
//      System.out.println(h1.toString());
//
//      //    ,      
//      int modifiers = constructor1.getModifiers();
//      if (Modifier.isPublic(modifiers)) {
//        System.out.println(" public");
//      }

//      ////            ,        
//      Constructor constructor2 = humanClass.getDeclaredConstructor(String.class, Integer.TYPE, Float.TYPE);
//      //        
//      constructor2.setAccessible(true);
//      //               ,      
//      Human human2 = constructor2.newInstance("zll", 18, 1.80f);
//      System.out.println(human2.toString());

      //           
      Constructor>[] constructors = humanClass.getDeclaredConstructors();

      for (Constructor> c : constructors) {
        c.setAccessible(true);
        System.out.println(c.getName());
        System.out.println("===========================");
        //    
        Class>[] types = c.getParameterTypes();
        for (Class> type : types) {
          System.out.println(type.getTypeName());
        }

        //     
        int modifiers = c.getModifiers();
        if (Modifier.isPublic(modifiers)) {
          System.out.println("    ");
        }else if (Modifier.isPrivate(modifiers)){
          System.out.println("    ");
        }
      }


    } catch (Exception e) {
      e.printStackTrace();
    }

  }
}

テスト取得フィールド

/**
 * Project: Day12_for_lxy
 * Created: Lulu
 * Date: 2016/8/10
 */

/*
    :
    :(               )
     
     
 */
public class TestField {
  public static void main(String[] args) {
    Class humanClass = Human.class;
    Field[] fields = humanClass.getDeclaredFields();
    for (Field f : fields) {

      //   
      System.out.print("   : " + f.getName() + " ");
      System.out.println();
      //  
      System.out.print("   :" + f.getType() + " ");
      System.out.println();
      //   
      int modifiers = f.getModifiers();
      if (Modifier.isPublic(modifiers)) {
        System.out.println("   ");
      } else if (Modifier.isPrivate(modifiers)) {
        System.out.println("   ");
      }
    }
    System.out.println("============================  ==================================");
    try {
      //       jobs  
      Field jobs = humanClass.getDeclaredField("jobs");
      //  
      ParameterizedType type = (ParameterizedType) jobs.getAnnotatedType().getType();
      Type[] types = type.getActualTypeArguments();
           for (Type type1 : types) {
        System.out.println(type1);
      }
    } catch (Exception e) {
      e.printStackTrace();
    }
    System.out.println("===================   ,    ============================");

    try {
      Human

取得方法のテスト

/**
 * Project: Day12_for_lxy
 * Created: Lulu
 * Date: 2016/8/10
 */
/*
    :
   
   
     
  

      

     

 */
public class TestMethod {
  public static void main(String[] args) {

    Class humanClass = Human.class;
    //   
    Method[] ms = humanClass.getDeclaredMethods();
    for (Method m : ms) {
      m.setAccessible(true);
      System.out.print("   : " + m.getName() + "  " );
      int modifiers = m.getModifiers();

      if (Modifier.isPublic(modifiers)) {
        System.out.println("   ");
      } else if (Modifier.isPrivate(modifiers)) {
        System.out.println("   ");
      }
    }
    //                       ,   
    try {
      //    
      Method sayM = humanClass.getDeclaredMethod("say");
      Class> returnType = sayM.getReturnType();
      System.out.println(returnType.toString());
      //  
      Method getListM = humanClass.getDeclaredMethod("getList");
      System.out.println(getListM.getReturnType());

      ParameterizedType type = (ParameterizedType) getListM.getAnnotatedReturnType().getType();
      System.out.println(type);
      Type[] ts = type.getActualTypeArguments();
      for (Type t : ts) {
        System.out.println(t);
      }


    } catch (Exception e) {
      e.printStackTrace();
    }
  }
}

クラス情報のテスト

public static void main(String[] args) {
  printClassInfo(Student.class);
}

public static void printClassInfo(Class c){
    //Java         Object
    System.out.println(c.getName());
    System.out.println(c.getSimpleName());
    System.out.println(c.getSuperclass());

    Class[] interfaces = c.getInterfaces();
    for (Class anInterface : interfaces) {
      System.out.println(anInterface);
    }
    //              (public   default)
    int modifiers = c.getModifiers();
  }

読書に感謝して、みんなを助けることができることを望んで、みんなの当駅に対する支持に感謝します!