JAVA EXAMPLE

1. 多线程编程

package org.gocom.abframe.auth;

import java.io.FileNotFoundException;
import java.io.PrintWriter;
import java.text.SimpleDateFormat;
import java.util.Date;

public class AbTest extends Thread {

    private static Date date = new Date();
    private String date1;
    private static SimpleDateFormat sdf = new SimpleDateFormat("hh:mm:ss");
    //通过构造方法传参
    public AbTest(String date){
        this.date1 = date;
    }
    //重写run方法
    public void run(){
        while(true){
            if(sdf.format(AbTest.date).equals(date1)){
                System.out.println("-----执行定时任务------");
                Date begin = new Date();
                PrintWriter pw;
                try {
                    pw = new PrintWriter("d://time.log");
                    for(int i=0;i<10000;i++){
                        pw.println("任务："+i);
                    }
                    pw.close();
                    pw.flush();
                } catch (FileNotFoundException e) {
                    // TODO 自动生成 catch 块
                    e.printStackTrace();
                }
                Date end = new Date();
                System.out.println("任务执行时间："+(float)(end.getTime()-begin.getTime())/1000+"秒");
                System.out.println("------定时任务执行完成-------");
            }else{
                System.out.println("等待定时任务..."+sdf.format(AbTest.date)+" "+date1);
            }
            try {
                sleep(1000);
                AbTest.date = new Date();
            } catch (InterruptedException e) {
                // TODO 自动生成 catch 块
                e.printStackTrace();
            }
        }
    }
    public static void main(String[] args) {
        /*
        AbTest at = new AbTest("11:04:00");
        AbTest at2 = new AbTest("11:05:00");
        AbTest at3 = new AbTest("11:06:00");
        at.start();//start方法启动线程
        at2.start();
        at3.start();
        */

        //启动3个线程
        for(int i=0;i<3;i++){
            AbTest ab = new AbTest("16:4"+i+":00");
            ab.start();
            System.out.println("加载第"+i+"个线程");
        }
    }
}

2. Timer用法

package com.sdbank;

import java.util.Timer;
import java.util.TimerTask;

public class Test {

    public static void print(){
        System.out.println(1);
    }
    public static void main(String[] args) {
        final Timer t = new Timer();
        t.schedule(new TimerTask() {
            private int count = 5;
            @Override
            public void run() {
                if(count==0){
                    print();
                    t.cancel();
                }else{
                    System.out.println(count);
                    count--;
                }
            }
        }, 1000,1000);//1秒后开始执行，每隔1s重复执行
    }

}