反射常见方法

package Demo1; 

import java.io.InputStream;
import java.util.List;
//被反射类
public class person { 
    public String name="li liangliang";
    public person()
    {
        System.out.print("my name is person");
    }
    public person(String name,int age)
    {
        System.out.println("name="+ name+"   age="+age);
    }
    private person(String name)
    {
        System.out.print(name);
    }
    public void aal()
    {
        System.out.println("aal");
    }
    public void aal(String name,int password)
    {
        System.out.print(name+":"+"password"+password);
    }
    public Class[] aal(String name,int[] password)
    {
        return new Class[]{String.class};
    }
    private void aal(InputStream in)
    {
        System.out.print(in);
    }
    public static void aal(int num)
    {
        System.out.println(num);
    }
}

反射

package Demo1;

import static org.junit.Assert.*;

import java.lang.reflect.Constructor;
import java.lang.reflect.Method;

import org.junit.Test;

public class Demo1TestTest {
    //反射public void aal()
    @Test
    public void Test1()throws Exception{
        person p=new person();
        Class clazz=Class.forName("Demo1.person");
        Method method=clazz.getMethod("aal", null);
        method.invoke(p,null);
    }
    //反射public void aal(String name,int password)
    public void Test2()throws Exception{
        person p=new person();
        Class clazz=Class.forName("Demo1.person");
        Method method=clazz.getMethod("aal",String.class,int.class);
        method.invoke(p,"liang",22);
    }
    public void Test3()throws Exception{
        person p=new person();
        Class clazz=Class.forName("Demo1.person");
        Method method=clazz.getMethod("aal",String.class,int[].class);
        Class cs[]=(Class[]) method.invoke(p,"liang",new int[]{1,2,3,4});
        System.out.print(cs[0]);
    }
}

package Demo1;

import static org.junit.Assert.*;

import java.lang.reflect.Constructor;
import java.lang.reflect.InvocationTargetException;
import java.util.ArrayList;

import org.junit.Test;

import com.sun.xml.internal.bind.v2.schemagen.xmlschema.List;

public class Demo2Test {

    @Test
    public void test() throws ClassNotFoundException, NoSuchMethodException, SecurityException, InstantiationException, IllegalAccessException, IllegalArgumentException, InvocationTargetException {
        Class clazz=Class.forName("Demo1.person");
        Constructor c=clazz.getConstructor(null);
        person p=(person)c.newInstance(null);
         System.out.print(p.name);
    }
    @Test
    public void Test1()throws Exception{
        Class clazz=Class.forName("Demo1.person");
        Constructor c=clazz.getConstructor(String.class);
        person p=(person) c.newInstance("xxxxx");
    }
    @Test
    public void Test()throws Exception{
        Class clazz=Class.forName("Demo1.person");
        Constructor c=clazz.getConstructor(String.class,int.class);
        person p=(person) c.newInstance("int",11);
    }
    @Test
    public void Test4()throws Exception{
        Class clazz=Class.forName("Demo1.person");
        Constructor c=clazz.getDeclaredConstructor(String.class);
        c.setAccessible(true);
        person p=(person)c.newInstance("abc");
    
    }
    @Test
    public void Test5()throws Exception{
        Class clazz=Class.forName("Demo1.person");
        person p=(person)clazz.newInstance();
    
    }
}