package com.lilei.pack09;

public class Logger {

    public void show(){

        System.out.println("hello world");

    }

    public int cal(int a,int b){

        return a + b;

    }

    public String multi(String... args){

        return args.length+";";

    }

}

package com.lilei.pack09;

import java.lang.reflect.InvocationTargetException;

import java.lang.reflect.Method;

public class app1 {

    public static void main(String[] args) throws ClassNotFoundException, NoSuchMethodException, SecurityException, IllegalAccessException, IllegalArgumentException, InvocationTargetException {

        Class c = Class.forName("com.lilei.pack09.Logger");

        Method[] ms = c.getMethods();

        Method m_show = c.getMethod("show", null);

        m_show.invoke(new Logger(), null);

        Method m_cal = c.getMethod("cal", new Class[]{int.class,int.class});

        Object result = m_cal.invoke(new Logger(), 233,2233);

        new Logger().multi("v","dd","ds");

        System.out.println(result);

        Method m_multi = c.getMethod("multi", new Class[]{String[].class});

        result = m_multi.invoke(new Logger(), new Object[]{new String[]{"v","dd","ds"}});

        System.out.println(result);

    }

}

package com.lilei.pack09;

import java.util.Date;

public class app2 {

    public static void main(String[] args) {

        Logger logger = new Logger();

        int result = 0;

        System.out.println(new Date());

        for (int i = 0; i < 2000000000; i++){

            result += logger.cal(i,i);

        }

        System.out.println(result);

        System.out.println(new Date());

    }

}

package com.lilei.pack09;

import java.lang.reflect.InvocationTargetException;

import java.lang.reflect.Method;

import java.util.Date;

public class app3 {

    public static void main(String[] args) throws NoSuchMethodException, SecurityException, IllegalAccessException, IllegalArgumentException, InvocationTargetException {

        Logger logger = new Logger();

        Method m = logger.getClass().getMethod("cal", new Class[]{int.class,int.class});

        int result = 0;

        System.out.println(new Date());

        for (int i = 0; i < 2000000000; i++){

            Integer in = (Integer)m.invoke(logger, i,i);

            result += in.intValue();

        }

        System.out.println(result);

        System.out.println(new Date());

    }

}