java 中反射简单使用示例

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package reflect_test;public class Dog implements Animals {    private  int age =100;    private  String xstr="test...";    public  int page = 100000;private  Dog(String xstr) {    this.xstr = xstr;    }    public Dog() {    }    public Dog(int age) {    this.age = age;    }@Overridepublic String scrime(String str) {return str;}public int getAge() {return age;}public void setAge(int age) {this.age = age;}private   int  getAddAge() {return age+=10;}public void getXstr() {System.out.println(xstr);}}----------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------测试类：package reflect_test;import java.lang.reflect.Constructor;import java.lang.reflect.Field;import java.lang.reflect.InvocationTargetException;import java.lang.reflect.Method;import org.junit.Before;import org.junit.Test;public class TestDemo {Class clazz= null;Class interfa = null;Object obj = null;@Beforepublic void init() throws ClassNotFoundException, InstantiationException, IllegalAccessException {clazz = Class.forName("reflect_test.Dog");interfa = Class.forName("reflect_test.Animals");obj = clazz.newInstance(); }//调用非私有成员函数@Testpublic void MethodTest() throws NoSuchMethodException, SecurityException, IllegalAccessException, IllegalArgumentException, InvocationTargetException {Method m = clazz.getMethod("scrime", String.class);Object object = m.invoke(obj, "say.....");System.out.println(object);}//调用私有成员函数@Testpublic void privateMethodTest() throws NoSuchMethodException, SecurityException, IllegalAccessException, IllegalArgumentException, InvocationTargetException {Method m = clazz.getDeclaredMethod("getAddAge");m.setAccessible(true);Object object = m.invoke(obj);System.out.println(object);}//获取非私有构造函数@Testpublic void getNotPrivateConstructor() throws Exception {Constructor construct = clazz.getConstructor(int.class);Dog dog = (Dog)construct.newInstance(10);System.out.println("The age is : "+dog.getAge());}//获取私有构造函数@Testpublic void getPrivateConstructor() throws Exception {//该出方法与非私有构造器区别getDeclaredConstructorConstructor construct = clazz.getDeclaredConstructor(String.class);//获得权限construct.setAccessible(true);Dog dog = (Dog)construct.newInstance("1000");dog.getXstr();}//获取非私有变量@Testpublic void getField() throws Exception {Field f = clazz.getDeclaredField("age");f.setAccessible(true);Object value = f.get(obj);System.out.println(value);}//获取私有变量@Testpublic void getPirvateField() throws Exception {Field f = clazz.getField("page");Object value = f.get(obj);System.out.println(value);}}

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