类方法学习二:getClasses()、getDeclaredClasses()

一.定义

Class[] getDeclaredClasses()

返回类中定义的公共、私有、保护的内部类

Class[] getClasses()

返回类定义的公共的内部类,以及从父类、父接口那里继承来的内部类

二.例子

1.GrandFather.java

public class GrandFather {

  public class ClassG_Pub {

    int x;

  }



  class ClassG_Pro {

    int x;

  }



  private class ClassG_Pri {

    int x;

  }

  public interface InterfG_Pub {

    public String getName();

  }



  interface InterfG_Pro {

    public String getName();

  }



  private interface InterfG_Pri {

    public String getName();

  }



}

2.Father.java

public class Father extends GrandFather{

  public class ClassF_Pub {

    int x;

  }



  class ClassF_Pro {

    int x;

  }



  private class ClassF_Pri {

    int x;

  }

  public interface InterfF_Pub {

    public String getName();

  }



  interface InterfF_Pro {

    public String getName();

  }



  private interface InterfF_Pri {

    public String getName();

  }



}

3.Son.java

public class Son extends Father{

  public class ClassS_Pub {

    int x;

  }



  class ClassS_Pro {

    int x;

  }



  private class ClassS_Pri {

    int x;

  }

  public interface InterfS_Pub {

    public String getName();

  }



  interface InterfS_Pro {

    public String getName();

  }



  private interface InterfS_Pri {

    public String getName();

  }



  public static void main(String args[]) throws Exception{

    System.out.println("getClasses:");

    for (Class c:Son.class.getClasses()) {

      System.out.println("class name:" + c.getName());

    }



    System.out.println("getDeclaredClasses:");

    for (Class c:Son.class.getDeclaredClasses()) {

      System.out.println("class name:" + c.getName());

    }

  }



}

4.java Son的输出结果是:

getClasses:

class name:Son$InterfS_Pub

class name:Son$ClassS_Pub

class name:Father$InterfF_Pub

class name:Father$ClassF_Pub

class name:GrandFather$InterfG_Pub

class name:GrandFather$ClassG_Pub

getDeclaredClasses:

class name:Son$InterfS_Pri

class name:Son$InterfS_Pro

class name:Son$InterfS_Pub

class name:Son$ClassS_Pri

class name:Son$ClassS_Pro

class name:Son$ClassS_Pub