8){JOptionPane.showConfirmDialog(null,"用户名长度应该在4-8位之间!!");loginUserName.requestFocus();}elseif(checkUserNameValid(loginUserName.getText())==false){JOptionPane.showConfirmDialog(null,"不是合法的用户名!!");loginUserName.requestFocus();}else{-IMDN开发者社群-imdn.cn"> 8){JOptionPane.showConfirmDialog(null,"用户名长度应该在4-8位之间!!");loginUserName.requestFocus();}elseif(checkUserNameValid(loginUserName.getText())==false){JOptionPane.showConfirmDialog(null,"不是合法的用户名!!");loginUserName.requestFocus();}else{ - IMDN开发者社群-imdn.cn">
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摆动

于 2022-12-13 发布 文件大小:175.29 kB
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下载积分: 2 下载次数: 1

代码说明:

图书管理系统用户的登录、注册、修改密码 if (loginUserName.getText().length() == 0) { JOptionPane.showConfirmDialog(null, "请输入用户名!!"); loginUserName.requestFocus(); } else if (loginUserName.getText().length() < 4 || loginUserName.getText().length() > 8) { JOptionPane.showConfirmDialog(null, "用户名长度应该在4-8位之间!!"); loginUserName.requestFocus(); } else if (checkUserNameValid(loginUserName.getText()) == false) { JOptionPane.showConfirmDialog(null, "不是合法的用户名!!"); loginUserName.requestFocus(); } else {

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