[英]Parse Exception MaskFormatter
I'm trying to use MaskFormatter
with JFormattedTextField
. 我正在尝试将
MaskFormatter
与JFormattedTextField
一起使用。
Inside my class I have this line of code 在我的课堂中,我有这行代码
JFormattedTextField jtfCNP=new JFormattedTextField(new MaskFormatter(formatCNP));
When I compile, I get the ParseException
. 编译时,我得到
ParseException
。 The only way around it I found to create the instance of the MaskFormatter
inside the constructor of my GUI panel inside a try
block like this 围绕它的唯一方法是,我发现在这样的
try
块内的GUI面板的构造函数内创建MaskFormatter
的实例
try { format_cnp=new MaskFormatter("# ###### ######");
jtf_cnp=new JFormattedTextField(format_cnp);
} catch (ParseException pex) {}
jtf_cnp.setColumns(20);
I'd like the functionality of the MaskFormatter, but isn't there any way to instantiate it outside a method? 我想要MaskFormatter的功能,但是没有方法在方法之外实例化它吗? Also, is there a better alternative to
MaskFormatter
? 此外,还有更好的替代
MaskFormatter
吗?
Edit: the sample code that doesn't work: 编辑:无效的示例代码:
import java.awt.*;
import java.awt.event.*;
import javax.swing.*;
import java.text.*;
import javax.swing.text.*;
public class test extends JFrame{
String formatCNP="# ###### ######";
//components
JFormattedTextField jtfCNP=new JFormattedTextField(new MaskFormatter(formatCNP));
public test(){
super("MaskFormatter Test");
setSize(300,300);
setLocationRelativeTo(null);
setDefaultCloseOperation(JFrame.EXIT_ON_CLOSE);
jtfCNP.setColumns(20);
add(jtfCNP);
setVisible(true);
}
public static void main(String[] args){
test tf=new test();
}
}
MaskFormatter
should be created as method, void. MaskFormatter
应该作为方法创建,无效。 etc 等等
read Initial Thread
读取
Initial Thread
create an local variable for JFrame
, don't to extend whatever in Swing, nor for Top-Level Containers
, 为
JFrame
创建局部变量,不要扩展Swing中的任何内容,也不要扩展Top-Level Containers
,
search for Java Naming Convention
, eg class & constructor name should be Test
instead of test
搜索
Java Naming Convention
,例如,类和构造函数名称应为Test
而不是test
. 。
import javax.swing.JFormattedTextField;
import javax.swing.JFrame;
import javax.swing.SwingUtilities;
import javax.swing.text.*;
public class Test {
private String formatString = "##/######";
private MaskFormatter formatCNP = createFormatter(formatString);
private JFormattedTextField jtfCNP = new JFormattedTextField(formatCNP);
private JFrame frame = new JFrame("MaskFormatter Test");
public Test() {
jtfCNP.setColumns(20);
frame.setLocationRelativeTo(null);
frame.setDefaultCloseOperation(JFrame.EXIT_ON_CLOSE);
frame.add(jtfCNP);
frame.pack();
frame.setVisible(true);
}
MaskFormatter createFormatter(String format) {
MaskFormatter formatter = null;
try {
formatter = new MaskFormatter(format);
formatter.setPlaceholderCharacter('.'/*or '0' etc*/);
formatter.setAllowsInvalid(false); // if needed
formatter.setOverwriteMode(true); // if needed
} catch (java.text.ParseException exc) {
System.err.println("formatter is bad: " + exc.getMessage());
}
return formatter;
}
public static void main(String[] args) {
SwingUtilities.invokeLater(new Runnable() {
@Override
public void run() {
Test tf = new Test();
}
});
}
}
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