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  • Java判断一个字符是否是数字的几种方法的代码

    在工作期间,将写内容过程经常用到的一些内容段做个记录,下面内容是关于Java判断一个字符是否是数字的几种方法的内容,希望能对码农们有好处。

    public class Test
    {
    public static void main(String[] args)
    {
    char[] ch =
    {
    'a', '1', 'b', '2', 'c', '3', 'd', '4',
    };
    System.out.println(ch[0] + ": " + isDigitA(ch[0]));
    System.out.println(ch[1] + ": " + isDigitA(ch[1]));
    System.out.println(ch[2] + ": " + isDigitB(ch[2]));
    System.out.println(ch[3] + ": " + isDigitB(ch[3]));
    System.out.println(ch[4] + ": " + isDigitC(ch[4]));
    System.out.println(ch[5] + ": " + isDigitC(ch[5]));
    System.out.println(ch[6] + ": " + isDigitD(ch[6]));
    System.out.println(ch[7] + ": " + isDigitD(ch[7]));
    }

    private static boolean isDigitA(char ch)
    {
    return Character.isDigit(ch);
    }

    private static boolean isDigitB(char ch)
    {
    Pattern pattern = Pattern.compile("[0-9]");
    return pattern.matcher(String.valueOf(ch)).matches();
    }

    private static boolean isDigitC(char ch)
    {
    if (ch < 48 || ch > 57)
    return false;
    else
    return true;
    }

    private static boolean isDigitD(char ch)
    {
    try
    {
    int i = Integer.parseInt(String.valueOf(ch));
    return true;
    }
    catch (NumberFormatException e)
    {
    e.printStackTrace();
    return false;
    }

    }
    }





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  • 原文地址:https://www.cnblogs.com/javahouse/p/10064436.html
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