Java多线程环境下SimpleDateFormat类的安全转换方法

本篇内容主要讲解"Java多线程环境下SimpleDateFormat类的安全转换方法"，感兴趣的朋友不妨来看看。本文介绍的方法操作简单快捷，实用性强。下面就让小编来带大家学习"Java多线程环境下SimpleDateFormat类的安全转换方法"吧!

一、SimpleDateFormat类

package state;import java.text.ParseException;import java.text.SimpleDateFormat;import java.util.Date;/** * SimpleDateFormat类负责日期的转换与格式化 * 解决SimpleDateFormat类多线程环境下转换错误问题 * @author zc * */public class SimpleDateFormatThread extends Thread{  private SimpleDateFormat sdf;  private String dateString;    public SimpleDateFormatThread(SimpleDateFormat sdf,String dateString) {   super();   this.sdf =sdf;   this.dateString =dateString;  }   @Override public void run() {  try {  //System.out.println(dateString);  //刚开始日期格式设置错误为YYYY-MM-dd  Date date =DateTools.getSimpleDateFormat("yyyy-MM-dd").parse(dateString);      // System.out.println(date);  String newDateString =DateTools.getSimpleDateFormat("yyyy-MM-dd").format(date).toString();    if(!newDateString.equals(dateString)) {  System.out.println("ThreadName="+this.getName()+"报错日期"+dateString+" 转换日期"+newDateString);  }else {  System.out.println("ThreadName="+this.getName()+"日期"+dateString+"  转换日期"+newDateString);  } } catch (ParseException e) {  // TODO Auto-generated catch block  e.printStackTrace(); } }  public static void main(String[] args) { SimpleDateFormat sdf =new SimpleDateFormat("yyyy-MM-dd"); String[] dateStringArray =new String[]{  "2020-02-05","2020-02-06","2020-02-07","2020-02-08" }; SimpleDateFormatThread []threadArray= new SimpleDateFormatThread[4]; for(int i=0;i<4;i++) {  threadArray[i] =new SimpleDateFormatThread(sdf,dateStringArray[i]); } for(int i=0;i<4;i++) {  threadArray[i].start(); } }}class DateTools{ //ThreadLocal能使线程绑定到指定的对象 private static ThreadLocal t = new ThreadLocal();  public static SimpleDateFormat getSimpleDateFormat(String datePattern) { SimpleDateFormat sdf=null; sdf =t.get(); if(sdf==null) {    sdf =new SimpleDateFormat(datePattern);   t.set(sdf);  } return sdf; }}

二、线程状态和线程组

(2)线程5状态//NEW 尚未启动的线程//RUNNABLE Java虚拟机中执行的线程//TERMINATED 已经退出的线程//BLOCKED 阻塞受监视的线程//WAITING 无限等待另一个线程//TIMED_WAITING 等待另一个线程指定时间package state;/** * 线程中状态和线程组 * @author zc * */public class MyThread extends Thread{  //NEW  //RUNNABLE  //TERMINATED  //BLOCKED  //WAITING  //TIMED_WAITING public MyThread() { System.out.println("构造方法中的状态: "+Thread.currentThread().getState()); } @Override public void run() { System.out.println("run方法中的状态:"+Thread.currentThread().getState()); try {  Thread.sleep(1000); } catch (InterruptedException e) {  // TODO Auto-generated catch block  e.printStackTrace(); } }  public static void main(String[] args) {   MyThread myThread = new MyThread();   System.out.println("main方法中的状态1 "+ myThread.getState());      Thread t1 = new Thread();   Thread t2 = new Thread();   ThreadGroup group =new ThreadGroup("左氏线程组");   Thread t3 = new Thread(group,t1);   Thread t4 = new Thread(group,t2);   t3.start();   t4.start();   System.out.println("活动的线程数量为: " +group.activeCount());   System.out.println("线程组的名称为: "+group.getName());      try {  myThread.start();  Thread.sleep(1000);  System.out.println("main方法中的状态2 "+ myThread.getState()); } catch (InterruptedException e) {  // TODO Auto-generated catch block  e.printStackTrace(); } }}

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