package fanshe;
import java.lang.reflect.Constructor;
import java.lang.reflect.Field;
import java.lang.reflect.InvocationTargetException;
import java.lang.reflect.Method;
public class testDemo {
public static void main(String[] args) throws Exception {
method_9();
}
private static void method_9() throws Exception, Exception {
// TODO Auto-generated method stub
Class clazz=Class.forName("fanshe.person");
Method method=clazz.getMethod("show",String.class);
Object obj=clazz.newInstance();
method.invoke(obj,"show传值");
}
private static void method_8() throws Exception {
Class clazz=Class.forName("fanshe.person");
Method method=clazz.getMethod("show", null);
//Object obj=clazz.newInstance();
Constructor constructor=clazz.getConstructor(String.class,int.class);
Object obj=constructor.newInstance("李亮亮",33);
method.invoke(obj,null);
}
//调用指定方法
private static void method_7() throws Exception {
Class clazz=Class.forName("fanshe.person");
Method method=clazz.getMethod("show", null);
Object obj=clazz.newInstance();
method.invoke(obj, null);
}
//获取指定Class中的公共函数
private static void method_6() throws Exception {
Class clazz=Class.forName("fanshe.person");
Method[] methods=clazz.getMethods();//获取的共有方法
methods=clazz.getDeclaredMethods();//只获得本类中的所有方法
for(Method method:methods)
{
System.out.println(method);
}
}
//设置字段
private static void method_5() throws Exception {
Class clazz=Class.forName("fanshe.person");
Field field=clazz.getDeclaredField("age");
field.setAccessible(true);
Object obj=clazz.newInstance();
field.set(obj, 33);
Object o=field.get(obj);
System.out.println(o);
}
//指定参数
private static void method_4() throws Exception {
String clazz="fanshe.person";
Class c1=Class.forName(clazz);
Constructor con=c1.getConstructor(String.class,int.class);
person obj=(person) con.newInstance("小强",33);
System.out.println(obj);
}
//反射创建对象
private static void method_3() throws ClassNotFoundException, InstantiationException, IllegalAccessException, NoSuchMethodException, SecurityException, IllegalArgumentException, InvocationTargetException {
String clazz="fanshe.person";
Class c1=Class.forName(clazz);
c1.newInstance();
/* Constructor con=c1.getConstructor();
person obj=(person) con.newInstance();
System.out.println(obj);*/
}
private static void method_2() {
Class<person> c1=person.class;
Class<person> c2=person.class;
System.out.println(c1==c2);
}
public static void method_1() {
person p=new person();
Class c1=p.getClass();
person p1=new person();
Class c2=p1.getClass();
System.out.println(c1==c2);
}
}
package fanshe;
public class person {
private int age;
private String name;
public person() {
System.out.println("空参数 run");
}
public person(String name, int age) {
this.name = name;
this.age = age;
System.out.println("两个run"+name+"age="+age);
}
public void show()
{
System.out.println("无参数show run");
}
public void show(String name)
{
System.out.println("show run"+name);
}
private void method()
{
System.out.println("show run");
}
}
