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import java.io.*;
import java.util.*;
import java.util.regex.*;
import java.text.*;
public class Main
{
public static void main(String[] args)
{
Scanner pz=new Scanner(new BufferedInputStream(System.in));
String str;
String[] ss=new String[5];//Ã÷Ã÷Ò»¸ö×ã¹»ÁË£¬ÒòΪÊäÈë±íʾֻ»áÔÚ×Ö´®Êײ¿»òĩβÓпոñ
//msÒ²ÄÜÒ»¸ö±í´ïʽ¸ã¶¨ËùÓеÄÇé¿ö£¬ÎÞÄÎÄÔÈÝÁ¿ÓÐÏÞ£¬Ïë²»³ö
Pattern pata=Pattern.compile("\\s*[+|-]?\\d+\\.\\d+[e|E][+|-]?\\d+\\s*");//Æ¥ÅäÀàËÆ +4.1234567890E-99999 »ò+4.13E99
Pattern patb=Pattern.compile("\\s*[+|-]?\\d+\\.\\d+\\s*");//Æ¥ÅäÀàËÆ 1.2
Pattern patc=Pattern.compile("\\s*[+|-]?\\d+[e|E][+|-]?\\d+\\s*");//Æ¥ÅäÀàËÆ 1e-12
Matcher mat=null;
while(pz.hasNext())
{
str=pz.nextLine();
if(str.charAt(0)=='*')
break;
ss=str.split(" ");
for(int i=0;i<ss.length;++i)
System.out.print(ss[i]);
mat=pata.matcher(str);
if(mat.matches())
System.out.println(" is legal.");
else
{
mat=patb.matcher(str);
if(mat.matches())
System.out.println(" is legal.");
else
{
mat=patc.matcher(str);
if(mat.matches())
System.out.println(" is legal.");
else
System.out.println(" is illegal.");
}
}
}
}
}


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http://download.csdn.net/source/2283940
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  Statement sta = null;
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1¡¢public boolean isNumber(String str)
{
if(java.lang.Character.isDigit(msg.charAt(0))){
    return true;
}
    return false;
}
}
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Ê×ÏÈÒªimport java.util.regex.Pattern ºÍ java.util.regex.Matcher
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