java - 将密码解析为整数

Question

这是在 Java Swing 中读取文本字段的代码

jbtLogin.addActionListener(new ActionListener() {
    String id=jtfId.getText();      

    String s=new String(jpass.getPassword());
    int password = Integer.parseInt(s); 

但我有这个错误：

Exception in thread "main" java.lang.NumberFormatException: For input     string: ""
    at java.lang.NumberFormatException.forInputString(Unknown Source)
    at java.lang.Integer.parseInt(Unknown Source)
    at java.lang.Integer.parseInt(Unknown Source)