java - 如何检查密码是否有数字？

Question

如何检查密码是否有数字？我已经办理了支票对于长度，但密码也需要数字，我该如何实现？我知道它与 char 类和循环有关，但我尝试过的一切都让我陷入了困境。任何建议都会有帮助。

import javax.swing.JOptionPane;
public class Pasword
{
    public static void main(String[] args)
    {
        String password1 = JOptionPane.showInputDialog(null, "Please Enter A Password That Contains 6 - 10 Characters One Of Which Is A Number");
        int len = password1.length();

        while((len < 6) || (len > 10))
        {
            password1 = JOptionPane.showInputDialog(null, "! INVALID !Please Enter A Password That Contains 6 - 10 Characters One Of Which Is A Number");
            len = password1.length();
        }

        String password2 = JOptionPane.showInputDialog(null, "!PASSWORD VALIDATOR! Please Re-Enter Password");
        int len2 = password2.length();

        while((len2 < 6) || (len2 > 10))
        {
            password2 = JOptionPane.showInputDialog(null, "! INVALID !Please Re-Enter");
            len2 = password2.length();
        }
                if(password1.equals(password2))
                {
                    JOptionPane.showMessageDialog(null, "Accepted");
                }
                else
                {
                    JOptionPane.showInputDialog(null, "Passwords do not match, Pleas Re-enter");
                }

    }

}

我是java新手，已经学到了很多关于它的知识，我只是在实现这些知识时遇到了问题。谢谢您

Answer 1

我会使用一些正则表达式。

System.out.println("x123".matches("(.*?)\\d(.*?)"));
System.out.println("xyz".matches("(.*?)\\d(.*?)"));