博客

import java.io.FileInputStream;
import java.io.InputStream;
import java.lang.reflect.Constructor;
import java.lang.reflect.InvocationTargetException;
import java.lang.reflect.Method;
import java.util.ArrayList;
import java.util.List;

import org.junit.Test;

public class Demo {

    /**
     * 反射类的方法
     * @throws Exception 
     *
     */

    //public void method(){
    @Test
    public void test1() throws Exception{
        
        Person p = new Person();
        
        Class clazz = Class.forName("Person");
        
        Method method = clazz.getMethod("method", null);
        
        method.invoke(p, null);
        
    }
    
    //public void method(String name,int password){
    @Test
    public void test2() throws Exception{
        
        Person p = new Person();
        
        Class clazz = Class.forName("Person");
        
        Method method = clazz.getMethod("method", String.class,int.class);
        
        method.invoke(p, "zero",28);
        
    }
    
    //public Class[] method(String name,int[] password){
    @Test
    public void test3() throws Exception{
        
        Person p = new Person();
        
        Class clazz = Class.forName("Person");
        
        Method method = clazz.getMethod("method", String.class,int[].class);
        
        Class[] cs = (Class[]) method.invoke(p, "one",new int[]{1,2,3});
        
        System.out.println(cs[0]);
    }
    
    //public void method(InputStream in){
    @Test
    public void test4() throws Exception{
        
        Person p = new Person();
        
        Class clazz = Class.forName("Person");
        
        Method method = clazz.getDeclaredMethod("method", InputStream.class);
        
        method.setAccessible(true);
        
        method.invoke(p, new FileInputStream("c:\\1.txt"));
    }
    
    //public static void method(int num){
    @Test
    public void test5() throws Exception{
        
        Class clazz = Class.forName("Person");
        
        Method method = clazz.getMethod("method", int.class);
        
        method.invoke(null,29);
    }
    
    //调用main方法
    @Test
    public void test6() throws Exception{
        
        Class clazz = Class.forName("Person");
        
        Method method = clazz.getMethod("main", String[].class);
        
        method.invoke(null,(Object)new String[]{"aa","bb"});
    }
}

import java.io.InputStream;
import java.util.List;


public class Person {
    
    public String name="hellowrold";
    private int password;
    private static int age;

    public Person(){
        System.out.println("person");
    }
    
    public Person(String name){
        System.out.println("person :"+name);
    }
    
    public Person(String name,int password){
        System.out.println("person:"+name+password);
    }
    
    private Person(List list){
        System.out.println("list");
    }
    
    public void method(){
        System.out.println("eai1");
    }
    
    public void method(String name,int password){
        System.out.println("method"+name+password);
    }
    
    public Class[] method(String name,int[] password){
        return new Class[]{String.class};
    }
    
    public void method(InputStream in){
        System.out.println(in);
    }
    
    public static void method(int num){
        System.out.println(num);
    }
    
    public static void main(String[] args){
        System.out.println("main");
    }
    
}