ReflectTest

package com.djwl.test.studying;

import java.io.FileNotFoundException;
import java.io.IOException;
import java.lang.reflect.Constructor;
import java.lang.reflect.Field;
import java.lang.reflect.Method;
import java.lang.reflect.Modifier;

public class ReflectTest {

	public static void main(String args[]) {
		try {
			Class<?> c = Class.forName("com.djwl.test.studying.TestReflect");
			System.out.println(c);
			System.out.println("`````````````````````````````````````````````");
			// 构造方法
			System.out.println("\n\n=======构造方法：");
			Constructor<?> cts[] = c.getDeclaredConstructors();
			for (Constructor<?> ct : cts) {
				System.out.println("``````````````````");
				System.out.println("ct:	" + ct.toString());
				System.out.println("name:	" + ct.getName());
				System.out.println("ct class:" + ct.getDeclaringClass());
				for (Class<?> class1 : ct.getParameterTypes()) {
					System.out.println("param:" + class1);
				}
				for (Class<?> class1 : ct.getExceptionTypes()) {
					System.out.println("exc:" + class1);
				}
			}

			// 方法信息
			System.out.println("\n\n=======方法信息：");
			Method m[] = c.getDeclaredMethods();
			for (Method method : m) {
				System.out.println("``````````````````");
				System.out.println("method:	" + method.toString());
				System.out.println("name:	" + method.getName());
				System.out.println("getDeclaringClass:" + method.getDeclaringClass());
				for (Class<?> class1 : method.getParameterTypes()) {
					System.out.println("param:	" + class1);
				}
				for (Class<?> class1 : method.getExceptionTypes()) {
					System.out.println("exception:	" + class1);
				}
				System.out.println("return:	" + method.getReturnType());
			}

			// 获取类的字段(域)
			System.out.println("\n\n=======字段信息：");
			for (Field fld : c.getDeclaredFields()) {
				System.out.println("name = " + fld.getName());
				System.out.println("decl class = " + fld.getDeclaringClass());
				System.out.println("type = " + fld.getType());
				int mod = fld.getModifiers();
				System.out.println("modifiers = " + Modifier.toString(mod));
				System.out.println("-----");
			}

			// 根据方法的名称来执行方法
			System.out.println("\n\n=======根据方法的名称来执行方法：");
			Class[] paramTypes = new Class[2];
			paramTypes[0] = Integer.TYPE;
			paramTypes[1] = Integer.TYPE;
			Method method = c.getMethod("add", paramTypes);

			Object[] argList = new Object[2];
			argList[0] = new Integer(37);
			argList[1] = new Integer(43);

			ReflectTest t = new ReflectTest();
			Object returnObj = method.invoke(t, argList);
			Integer returnVal = (Integer) returnObj;

			System.out.println("方法执行结果为：" + returnVal.intValue());
		} catch (Throwable e) {
			System.err.println(e);
		}
	}

	public ReflectTest() {

	}

	public ReflectTest(String id) {

	}

	public ReflectTest(String id, String password, Integer age) throws IOException, FileNotFoundException {

	}

	public void update() {

	}

	public String getName() {
		return "xiaoming";
	}

	public Integer getAge(String userid) throws IOException {
		return 0;
	}

	public int add(int a, int b) {
		return a + b;
	}

	private String name;
	private String password;
	public Integer age;
}