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这篇文章将为大家详细讲解有关java 中反射简单使用示例，小编觉得挺实用的，因此分享给大家做个参考，希望大家阅读完这篇文章后可以有所收获。
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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;
}
@Override
public 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);
}
}
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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;
@Before
public 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
@Test
public 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
@Test
public 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
@Test
public 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
@Test
public void getPrivateConstructor() throws Exception {
//该出方法与非私有构造器区别getDeclaredConstructor
Constructor 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
@Test
public 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
@Test
public void getPirvateField() throws Exception {
Field f = clazz.getField("page");
Object value = f.get(obj);
System.out.println(value);
}
}关于“java 中反射简单使用示例”这篇文章就分享到这里了，希望以上内容可以对大家有一定的帮助，使各位可以学到更多知识，如果觉得文章不错，请把它分享出去让更多的人看到。
