====String 转成Int=======
1). int i = Integer.parseInt([String]); 或
i = Integer.parseInt([String],[int radix]);
2). int i = Integer.valueOf(my_str).intValue();
====INT转String=============
有叁种方法:
1.) String s = String.valueOf(i);
2.) String s = Integer.toString(i);
3.) String s = "" + i;
注: Double, Float, Long 转成字串的方法大同小异.
====字符串时间格式转成Date====
SimpleDateFormat sdf=new SimpleDateFormat("yyyy-MM-dd");//小写的mm表示的是分钟
String dstr="2008-4-24";
Date time = sdf.parse(dstr);
System.out.println(time);//Thu Apr 24 00:00:00 CST 2008
====Date转成字符串时间格式====
SimpleDateFormat formatter = new SimpleDateFormat( "yyyy-MM-dd ");
String date = formatter.format(new Date());
====Date的各种使用============
Date dt =new Date();
System.out.println(dt); //格式: Wed Jul 06 09:28:19 CST 2016
//格式:2016-7-6
String formatDate = null;
formatDate = DateFormat.getDateInstance().format(dt);
System.out.println(formatDate);
//格式:2016年7月6日 星期三
formatDate = DateFormat.getDateInstance(DateFormat.FULL).format(dt);
System.out.println(formatDate);
//格式 24小时制:2016-07-06 09:39:58
DateFormat dFormat = new SimpleDateFormat("yyyy-MM-dd HH:mm:ss"); //HH表示24小时制;
formatDate = dFormat.format(dt);
System.out.println(formatDate);
//格式12小时制:2016-07-06 09:42:44
DateFormat dFormat12 = new SimpleDateFormat("yyyy-MM-dd hh:mm:ss"); //hh表示12小时制;
formatDate = dFormat12.format(dt);
System.out.println(formatDate);
//格式去掉分隔符24小时制:20160706094533
DateFormat dFormat3 = new SimpleDateFormat("yyyyMMddHHmmss");
formatDate = dFormat3.format(dt);
System.out.println(formatDate);
//格式转成long型:1467770970
long lTime = dt.getTime() / 1000;
System.out.println(lTime);
//格式long型转成Date型,再转成String: 1464710394 -> ltime2*1000 -> 2016-05-31 23:59:54
long ltime2 = 1464710394;
SimpleDateFormat lsdFormat = new SimpleDateFormat("yyyy-MM-dd HH:mm:ss");
Date lDate = new Date(ltime2*1000);
String lStrDate = lsdFormat.format(lDate);
System.out.println(lStrDate);
//格式String型转成Date型:2016-07-06 10:17:48 -> Wed Jul 06 10:17:48 CST 2016
String strDate = "2016-07-06 10:17:48";
SimpleDateFormat lsdStrFormat = new SimpleDateFormat("yyyy-MM-dd HH:mm:ss");
try {
Date strD = lsdStrFormat.parse(strDate);
System.out.println(strD);
} catch (ParseException e) {
e.printStackTrace();
}
====计算时间差=============
String beginTime=new String("2014-08-15 10:22:22");
String endTime=new String("2014-09-02 11:22:22");
SimpleDateFormat sdf=new SimpleDateFormat("yyyy-MM-dd");
long bt=sdf.parse(beginTime).getTime();
long et=sdf.parse(endTime).getTime();
long cha=(et-bt)/(1000*60*60*24);
System.out.println(cha);//18
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