java基礎，多段字符串驗證後拼接在一起

字符串驗證

LovoButton addBtn = new LovoButton("添加", 100, 240, this);

addBtn.addActionListener(newActionListener() {

 

publicvoid actionPerformed(ActionEvent e) {

Stringmsg = "";

 

if(!codeTxt.getText().matches("\\d+")){

msg += "編號必須爲數字\n";

}

if(!nameTxt.getText().matches("[a-zA-Z\\u4e00-\\u9fa5]{2,}")){

msg += "商品名必須爲漢字或者字母\n";

}

 

if(msg.length()!= 0){

JOptionPane.showMessageDialog(null,msg);

return;

}

add();        //下一步操作                        

}                                

});