package net.peace.ref;
import java.lang.reflect.Constructor;
import java.lang.reflect.Field;
import java.lang.reflect.InvocationTargetException;
import java.lang.reflect.Method;
import java.util.ArrayList;
import java.util.Collection;
import java.util.Stack;
public class TestRef {
public static void main(String[] args) {
// TODO Auto-generated method stub
//Stack<E>
try {
//装载指定的类
Class<Stack> c=(Class<Stack>) Class.forName("java.util.Stack");
//获得指定类名的方法;
Method ms[]=c.getDeclaredMethods();
//判断是否属于特定的类
System.out.println(c.isInstance(new Stack<>()));
for(Method m:ms){
//获得方法的一些信息;
System.out.println(m.getModifiers()+" "+m.getReturnType()+" "+m.getName());
//获得参数属性类
Class[] cc=m.getParameterTypes();
for(Class p:cc){
//获得类名
System.out.println(p.getName());
}
//获得异常类
Class[] ce=m.getExceptionTypes();
for(Class p:ce){
System.out.println(p.getName());
}
}
System.out.println("******************************");
//获得构造器方法
Constructor<Stack>[] con=(Constructor<Stack>[]) c.getDeclaredConstructors();
for(Constructor p:con){
System.out.println(p);
}
System.out.println("******************************");
//获取域
Field[] field=c.getDeclaredFields();
for(Field f:field){
System.out.println(f);
}
} catch (ClassNotFoundException e) {
// TODO Auto-generated catch block
e.printStackTrace();
}
System.out.println("******************************");
try {
//通过反射创建不是默认对象的构造器
Class list=Class.forName("java.util.ArrayList");
//参数类型设置
Class ps[]=new Class[1];
ps[0]=Integer.TYPE;
//获得对应参数的构造器
Constructor cons=list.getConstructor(ps);
//通过调用构造器构建对象
Integer[] os={3};
ArrayList t=( ArrayList)cons.newInstance(os);
t.add(1);
System.out.println(t.size());
//利用反射调用方法
//创建参数
Class ps3[]= new Class[1];
ps3[0]=Object.class;
//获得想要的方法 add
Method method1=list.getDeclaredMethod("add", ps3);
//进行调用 添加一个元素2;
method1.invoke(t, 2);//第一个参数是对象,第二个参数是方法参数;
///调用另外一个构造方法
Class ps2[]=new Class[1];
ps2[0]=Collection.class;
Constructor cons2=list.getConstructor(ps2);
ArrayList t2=( ArrayList)cons2.newInstance(t);
System.out.println(t2);
} catch (ClassNotFoundException e) {
// TODO Auto-generated catch block
e.printStackTrace();
} catch (NoSuchMethodException e) {
// TODO Auto-generated catch block
e.printStackTrace();
} catch (SecurityException e) {
// TODO Auto-generated catch block
e.printStackTrace();
} catch (InstantiationException e) {
// TODO Auto-generated catch block
e.printStackTrace();
} catch (IllegalAccessException e) {
// TODO Auto-generated catch block
e.printStackTrace();
} catch (IllegalArgumentException e) {
// TODO Auto-generated catch block
e.printStackTrace();
} catch (InvocationTargetException e) {
// TODO Auto-generated catch block
e.printStackTrace();
}
}
}