[英]JTextField contain control method
I have a text field (for name )that i want to prevent user to enter number, Or empty! 我有一个文本字段(用于name),我想防止用户输入数字,否则为空!
I try all of this, But there is some infirmity in it: 我尝试了所有这些,但是其中有些弱点:
public boolean nameControl(String str) {
if (haveDigit(str)) return false; // works corrctly
else if (str.isEmpty()) return false; // Not work
else if (str.length() == 0) return false; // not work
return true;
}
As described in How to Use the Focus Subsystem: Validating Input , you may be looking for InputVerifier
. 如如何使用“焦点子系统:验证输入”中所述 ,您可能正在寻找InputVerifier
。 There's a related example here , among others . 有一个相关的例子在这里 ,除其他 。
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