java验证字符串是否是数字

import java.util.regex.Matcher;
import java.util.regex.Pattern;


public class TestString
{
	public static void main(String[] args)
	{
		String number = "333333222343423";
		
		TestString test = new TestString();
		
		if (test.isNumber1(number))
		{
			System.out.println(number);
		}
		
		if (test.isNumber2(number))
		{
			System.out.println(number);
		}
		
	}
	
	/**
	 * 方法1
	 */
	private boolean isNumber1(String number)
	{
		Pattern pattern = Pattern.compile("[0-9]*");
		Matcher matcher = pattern.matcher(number);
		
		if (matcher.matches())
		{
			return true;
		}
		return false;
	}
	
	/**
	 * 方法2
	 */
	private boolean isNumber2(String number)
	{
		for (int i = 0; i < number.length(); i++)
		{
			if(Character.isDigit(number.charAt(i)))
			{
			    return true;（注意：此判断为字符串中包含有数字，与isNumber1判断有异，请灵活运用）
			}
		}
		return false;
	}
}

 本文来源于：http://zqc-0101.iteye.com/blog/1898312