java 反射机制

package com.zqflc.reflction;import java.lang.reflect.Field;import java.lang.reflect.InvocationTargetException;import java.lang.reflect.Method;@SuppressWarnings("all")public class TestReflction {public static void main(String[] args) {try {Class clazz = Class.forName("com.zqflc.reflction.Test");Object obj = clazz.newInstance();Field[] fields = clazz.getDeclaredFields();/** * 获取所有的成员变量 并设值 */for (Field field : fields) {System.out.println(field.getName());field.setAccessible(true);field.set(obj, "100000000");}/** * 获取所有的方法 */Method[] methods = clazz.getDeclaredMethods();for (Method method : methods) {if (method.getName().equals("getId")) {method.invoke(obj);//获取方法的返回类型Class returnType = method.getReturnType();System.out.println(returnType.getName());}if (method.getName().equals("setName")) {//动态调用对象的方法method.invoke(obj, new Object[] {"Young"});}if (method.getName().equals("getName")) {method.invoke(obj);}if (method.getName().equals("setName")) {//获取方法的参数类型for (Class parameterType : method.getParameterTypes()) {System.out.println(parameterType.getName());}}}} catch (ClassNotFoundException e) {e.printStackTrace();} catch (InstantiationException e) {e.printStackTrace();} catch (IllegalAccessException e) {e.printStackTrace();} catch (IllegalArgumentException e) {e.printStackTrace();} catch (InvocationTargetException e) {e.printStackTrace();}}}class Test {private String id;private String name;static {System.out.println("Test loaded!");}Test() {System.out.println("Test constructor!");}public String getId() {return id;}public void setId(String id) {this.id = id;}public String getName() {System.out.println(name);return name;}public void setName(String name) {this.name = name;}}