/**//*
* Created on 2005-5-13
* 利用正則表達式對數字進行判斷
* 代碼來源自PIGO，有改動
*/
package org.waityou.utils;
import java.util.regex.*;
/** *//**
* @author Ace
* thanks, pigo
*
*/
public class ValidationNumber 
{
private static Pattern intnumPattern;
private static Pattern numberPattern;
private static Pattern doublenumPattern;
public static boolean isintNumber(String aString) {
// 檢查一個字符串是否是整數 允許一個正負符號位
if (aString == null || aString.length() < 1) {
return false;
}
if (intnumPattern == null) {
intnumPattern = Pattern.compile("^[+-]?[\\d]+$");
}
return intnumPattern.matcher(aString).find();
}
public static boolean isNumber(String aString) {
// 檢查一個字符串是否全部是數字
if (aString == null || aString.length() < 1) {
return false;
}
if (numberPattern == null) {
numberPattern = Pattern.compile("^[\\d]+$"); // "^[+-]?([\\d]+)|([\\d]+\\.[\\d]+)$"
}
return numberPattern.matcher(aString).find();
}
public static boolean isdoubleNumber(String aString) {
//檢查一個字符串是否是浮點小數,浮點小數至少一個數字開頭,允許一個正負符號位
//中間只出現一個小數點,小數點之后至少一個數字
if (aString == null || aString.length() < 1) {
return false;
}
if (doublenumPattern == null) {
doublenumPattern = Pattern.compile("^[+-]?[\\d]+\\.[\\d]+$");
}
return doublenumPattern.matcher(aString).find();
}
public static void main(String[] args) {
// 測試
String intnum1 = "-23423";
String intnum2 = "234";
String numstring = "234sdf";
String num1 = "234234";
String doublenum1 = "0.123456";
String doublenum2 = "-0.23";
String doublenum3 = ".123123";
System.out.println("" + isintNumber(intnum1));
System.out.println("" + isintNumber(intnum2));
System.out.println("" + isintNumber(numstring));
System.out.println("" + isNumber(num1));
System.out.println("" + isNumber(numstring));
System.out.println("" + isdoubleNumber(doublenum1));
System.out.println("" + isdoubleNumber(doublenum2));
System.out.println("" + isdoubleNumber(doublenum3));
System.out.println("" + isdoubleNumber(numstring));
}
}