java反射机制学习代码

根据

http://www.iteye.com/topic/137944

文档进行学习

代码如下:

package reflectTest;

import java.lang.reflect.*;
import java.awt.event.ActionEvent;
import java.awt.event.ActionListener;
import java.io.*;

class A{

}

class B extends A{

}

class C extends B{

}

class TestClass extends Object implements ActionListener {
	private int a = 3;
	public Integer b = 4;
	public TestClass(){}
	public TestClass(int id,String name){}
	public void Abc(int id,String name){}
	public void ActionPerformed(ActionEvent e){}
}

public class Main {

	public static void main(String[] args) {
		// TODO Auto-generated method stub
		TestClass tc = new TestClass();
		Class temp = tc.getClass();
		//==============================================
		try{
			System.out.println("反射类中所有公有的属性");
			Field[] fb = temp.getFields();
			for(int i=0;i < fb.length;i++)
			{
				Class cl = fb[i].getType();
				System.out.println("fb: "+cl);
			}

			System.out.println("反射类中所有的属性");
			Field[] fa = temp.getDeclaredFields();
			for(int i = 0;i < fa.length;i++)
			{
				Class cl = fa[i].getType();
				System.out.println("fa: "+cl);
			}

			System.out.println("反射类中私有属性的值");
			Field f = temp.getDeclaredField("a");
			f.setAccessible(true);
			Integer i = (Integer)f.get(tc);
			System.out.println(i);
			//===============================
			String className = temp.getName();
			Constructor[] constructs = temp.getConstructors();
			for(int k = 0;k < constructs.length;k++)
			{
				Class[] Parametertypes = constructs[k].getParameterTypes();
				System.out.print(className + "(");
				for(int j =0 ;j < Parametertypes.length;j++)
				{
					System.out.print(Parametertypes[j].getName()+"  ");
				}
				System.out.println(")");
			}
			//==================================================================
			Class[] interfaces = temp.getInterfaces();
			for(int j = 0;j<interfaces.length;j++)
			{
				System.out.println(interfaces[j].getName());
			}
			Class superClass = temp.getSuperclass();
			System.out.println(superClass.getName());
			//=================================================================
			C c = new C();
			Class t = c.getClass();
			Class superClass1 = t.getSuperclass();
			System.out.println(c);
			System.out.println(c.getClass());
			System.out.println(c.getClass().getSuperclass());
			System.out.println(c.getClass().getSuperclass().getSuperclass());

		}catch(Exception e)
		{
			System.out.println(e);
		}
	}

}

运行结果如下:

反射类中所有公有的属性
fb: class java.lang.Integer
反射类中所有的属性
fa: int
fa: class java.lang.Integer
反射类中私有属性的值
3
reflectTest.TestClass()
reflectTest.TestClass(int java.lang.String )
java.awt.event.ActionListener
java.lang.Object
reflectTest.C@70dea4e
class reflectTest.C
class reflectTest.B
class reflectTest.A