import?java.math.BigDecimal;
import?java.text.DecimalFormat;
import?java.text.DecimalFormatSymbols;
import?java.util.regex.Matcher;
import?java.util.regex.Pattern;

/**
?*?
?*/

/**
?*?@author?zwb?
?*?@date?2017年7月18日
?*/
public?class?test?{
	public?static?void?main（String?args[]）
	{
		String?str=“201706“;
		System.out.println（str.substring（0?4））;
		System.out.println（str.substring（4）.startsWith（“0“））;
		
		int?i=Integer.parseInt（str）;
		System.out.println（i）;
		
		BigDecimal???bd???=???new???BigDecimal（“3.14159265“）;???
		
		

		float?price=Float.parseFloat（“00000123“）;
		
		System.out.println（price）;
		
		
		
		DecimalFormat?decimalFormat=new?DecimalFormat（“.000“）;//構造方法的字符格式這里如果小數不足2位會以0補足.
		
		String?p=decimalFormat.format（price）;//format?返回的是字符串
		System.out.println（p）;
		
		??bd???=???bd.setScale（0BigDecimal.ROUND_HALF_UP）;???
		??System.out.println（bd）;
		??
		??
		??DecimalFormat?df8?=?new?DecimalFormat（）;??
		??int?number?=?123456789;??
		??//?設置三個一組??
		??df8.setGroupingSize（3）;??
		??DecimalFormatSymbols?dfs?=?DecimalFormatSymbols.getInstance（）;??
		??//?設置小數字分隔符??
		??dfs.setDecimalSeparator（‘.‘）;??
		??dfs.setGroupingSeparator（‘‘）;??
		??
		??df8.setDecimalFormatSymbols（dfs）;??		??
		??System.out.println（df8.format（2220.20222））;??
		??df8.setGroupingUsed（false）;??
		??System.out.println（df8.format（2220.20222））;?
		??
		??
		??System.out.println（isNumeric（“好的好的回電話“））;?

	}
	
	//返回?0?不是數字，1?整數?，2?浮點小數
	public?static?int?isNumeric（String?str）{?
		???int?ret?=?0;
		???Pattern?pattern?=?Pattern.compile（“-?[0-9]+.?[0-9]+“）;?
		???Matcher?isNum?=?pattern.matcher（str）;
		???if（?!isNum.matches（）?）{
			???ret?=?0;
		???????return?ret;?
		???}
		???if（str.indexOf（“.“）?!=?-1）
		???{
			???ret?=?2;
		???}else
		???{
			???ret?=?1;
		???}
		???return?ret;?
		}

}

?屬性????????????大小?????日期????時間???名稱
-----------?---------??----------?-----??----

?????文件???????1093??2017-07-12?11:44??JexcelTemple\.classpath

?????文件???????1195??2017-07-12?11:44??JexcelTemple\.project

?????文件????????522??2017-07-12?11:44??JexcelTemple\.settings\.jsdtscope

?????文件????????670??2017-07-17?14:25??JexcelTemple\.settings\org.eclipse.jdt.core.prefs

?????文件????????495??2017-07-12?11:44??JexcelTemple\.settings\org.eclipse.wst.common.component

?????文件????????414??2017-07-12?11:44??JexcelTemple\.settings\org.eclipse.wst.common.project.facet.core.xml

?????文件?????????49??2017-07-12?11:44??JexcelTemple\.settings\org.eclipse.wst.jsdt.ui.superType.container

?????文件??????????6??2017-07-12?11:44??JexcelTemple\.settings\org.eclipse.wst.jsdt.ui.superType.name

?????文件?????????66??2017-07-12?11:44??JexcelTemple\.tern-project

?????文件??????25088??2017-07-21?10:16??JexcelTemple\object_collection_template.xls

?????文件???????3139??2017-07-20?15:54??JexcelTemple\src\common\utils\JxlsUtils.java

?????文件???????1226??2017-07-17?17:53??JexcelTemple\src\jxls\demo\guide\Employee.java

?????文件???????2383??2017-07-21?10:18??JexcelTemple\src\jxls\demo\guide\objectCollectionDemo.java

?????文件??????59392??2017-07-17?11:27??JexcelTemple\src\jxls-template\object_collection_template.xls

?????文件???????1241??2017-07-17?11:27??JexcelTemple\src\log4j.properties

?????文件???????2014??2017-07-21?10:52??JexcelTemple\src\test.java

?????文件????????834??2017-07-12?11:44??JexcelTemple\WebRoot\index.jsp

?????文件?????????39??2017-07-12?11:44??JexcelTemple\WebRoot\meta-INF\MANIFEST.MF

?????文件???????4720??2017-07-21?14:04??JexcelTemple\WebRoot\WEB-INF\classes\common\utils\JxlsUtils.class

?????文件???????4869??2017-07-21?14:04??JexcelTemple\WebRoot\WEB-INF\classes\jxls\demo\guide\CCBB.class

?????文件???????1634??2017-07-21?14:04??JexcelTemple\WebRoot\WEB-INF\classes\jxls\demo\guide\Employee.class

?????文件???????3197??2017-07-21?14:04??JexcelTemple\WebRoot\WEB-INF\classes\jxls\demo\guide\objectCollectionDemo.class

?????文件????????281??2017-07-21?14:04??JexcelTemple\WebRoot\WEB-INF\classes\jxls\demo\guide\SPQQKHJG.class

?????文件??????59392??2017-07-17?11:27??JexcelTemple\WebRoot\WEB-INF\classes\jxls-template\object_collection_template.xls

?????文件???????1241??2017-07-17?11:27??JexcelTemple\WebRoot\WEB-INF\classes\log4j.properties

?????文件???????2575??2017-07-21?14:04??JexcelTemple\WebRoot\WEB-INF\classes\test.class

?????文件?????267634??2017-07-21?13:59??JexcelTemple\WebRoot\WEB-INF\lib\commons-jexl-2.1.1.jar

?????文件??????61829??2017-07-21?13:59??JexcelTemple\WebRoot\WEB-INF\lib\commons-logging-1.2.jar

?????文件??????31605??2017-07-21?13:59??JexcelTemple\WebRoot\WEB-INF\lib\commons-logging.jar

?????文件?????720702??2017-07-21?13:59??JexcelTemple\WebRoot\WEB-INF\lib\jxl-2.6.6.jar

............此處省略36個文件信息