Java Double的JFormattedTextField仍采用字符
我有一个JFormattedTextField,用户可以在其中输入价格,我有这个,但是如果我键入一个字符,它无论如何都会允许我输入。我需要这个文本字段只读取数字,或者从键盘读取,如果是字符则忽略。我应该如何改变它以使其工作Java Double的JFormattedTextField仍采用字符,java,swing,keyboard,double,jformattedtextfield,Java,Swing,Keyboard,Double,Jformattedtextfield,我有一个JFormattedTextField,用户可以在其中输入价格,我有这个,但是如果我键入一个字符,它无论如何都会允许我输入。我需要这个文本字段只读取数字,或者从键盘读取,如果是字符则忽略。我应该如何改变它以使其工作 JFormattedTextField formattedTextField = new JFormattedTextField(); formattedTextField.setBounds(25, 330, 56, 20); content
JFormattedTextField formattedTextField = new JFormattedTextField();
formattedTextField.setBounds(25, 330, 56, 20);
contentPanel.add(formattedTextField);
formattedTextField.setValue(new Double(10.0));
您需要设置格式化程序:
NumberFormat f = NumberFormat.getNumberInstance();
JFormattedTextField field = new JFormattedTextField(f);
看一看:和
然后试试这个:
PlainDocument doc = new PlainDocument();
doc.setDocumentFilter(new DocumentFilter() {
@Override
public void insertString(FilterBypass fb, int off, String str, AttributeSet attr)
throws BadLocationException
{
fb.insertString(off, str.replaceAll("\\D++", ""), attr); // remove non-digits
}
@Override
public void replace(FilterBypass fb, int off, int len, String str, AttributeSet attr)
throws BadLocationException
{
fb.replace(off, len, str.replaceAll("\\D++", ""), attr); // remove non-digits
}
});
JFormattedTextField field = new JFormattedTextField();
field.setDocument(doc);
您需要设置格式化程序:
NumberFormat f = NumberFormat.getNumberInstance();
JFormattedTextField field = new JFormattedTextField(f);
看一看:和
然后试试这个:
PlainDocument doc = new PlainDocument();
doc.setDocumentFilter(new DocumentFilter() {
@Override
public void insertString(FilterBypass fb, int off, String str, AttributeSet attr)
throws BadLocationException
{
fb.insertString(off, str.replaceAll("\\D++", ""), attr); // remove non-digits
}
@Override
public void replace(FilterBypass fb, int off, int len, String str, AttributeSet attr)
throws BadLocationException
{
fb.replace(off, len, str.replaceAll("\\D++", ""), attr); // remove non-digits
}
});
JFormattedTextField field = new JFormattedTextField();
field.setDocument(doc);
JFormattedTextField
可以用于很多事情,也可以用于过滤日期或电话号码。您需要将numberformatter
设置为TextField
,或者使用DocumentFilter(仅适用于JTextField)
检查此代码段,这就是使用DocumentFilter仅允许JTextField中的数字的方式,这是最有效的方式:
import java.awt.*;
import javax.swing.*;
import javax.swing.text.AbstractDocument;
import javax.swing.text.AttributeSet;
import javax.swing.text.BadLocationException;
import javax.swing.text.DocumentFilter;
import javax.swing.text.DocumentFilter.FilterBypass;
public class InputInteger
{
private JTextField tField;
private MyDocumentFilter documentFilter;
private void displayGUI()
{
JFrame frame = new JFrame("Input Integer Example");
frame.setDefaultCloseOperation(JFrame.DISPOSE_ON_CLOSE);
JPanel contentPane = new JPanel();
contentPane.setBorder(
BorderFactory.createEmptyBorder(5, 5, 5, 5));
tField = new JTextField(10);
((AbstractDocument)tField.getDocument()).setDocumentFilter(
new MyDocumentFilter());
contentPane.add(tField);
frame.setContentPane(contentPane);
frame.pack();
frame.setLocationByPlatform(true);
frame.setVisible(true);
}
public static void main(String[] args)
{
Runnable runnable = new Runnable()
{
@Override
public void run()
{
new InputInteger().displayGUI();
}
};
EventQueue.invokeLater(runnable);
}
}
class MyDocumentFilter extends DocumentFilter
{
@Override
public void insertString(DocumentFilter.FilterBypass fp
, int offset, String string, AttributeSet aset)
throws BadLocationException
{
int len = string.length();
boolean isValidInteger = true;
for (int i = 0; i < len; i++)
{
if (!Character.isDigit(string.charAt(i)))
{
isValidInteger = false;
break;
}
}
if (isValidInteger)
super.insertString(fp, offset, string, aset);
else
Toolkit.getDefaultToolkit().beep();
}
@Override
public void replace(DocumentFilter.FilterBypass fp, int offset
, int length, String string, AttributeSet aset)
throws BadLocationException
{
int len = string.length();
boolean isValidInteger = true;
for (int i = 0; i < len; i++)
{
if (!Character.isDigit(string.charAt(i)))
{
isValidInteger = false;
break;
}
}
if (isValidInteger)
super.replace(fp, offset, length, string, aset);
else
Toolkit.getDefaultToolkit().beep();
}
}
import java.awt.*;
导入javax.swing.*;
导入javax.swing.text.AbstractDocument;
导入javax.swing.text.AttributeSet;
导入javax.swing.text.BadLocationException;
导入javax.swing.text.DocumentFilter;
导入javax.swing.text.DocumentFilter.FilterBypass;
公共类输入整合器
{
私有JTextField;
私有MyDocumentFilter文档过滤器;
私有void displayGUI()
{
JFrame frame=新JFrame(“输入整数示例”);
frame.setDefaultCloseOperation(JFrame.DISPOSE_ON_CLOSE);
JPanel contentPane=新的JPanel();
contentPane.setOrder(
createEmptyByOrder(5,5,5,5));
tField=新的JTextField(10);
((AbstractDocument)tField.getDocument()).setDocumentFilter(
新建MyDocumentFilter());
contentPane.add(tField);
frame.setContentPane(contentPane);
frame.pack();
frame.setLocationByPlatform(真);
frame.setVisible(true);
}
公共静态void main(字符串[]args)
{
Runnable Runnable=新的Runnable()
{
@凌驾
公开募捐
{
新建InputIntegrater().displayGUI();
}
};
invokeLater(可运行);
}
}
类MyDocumentFilter扩展了DocumentFilter
{
@凌驾
public void insertString(DocumentFilter.FilterBypass fp
,整数偏移量,字符串,属性集(aset)
抛出BadLocationException
{
int len=string.length();
布尔值isValidInteger=true;
对于(int i=0;i
AJFormattedTextField
可以用于很多事情,也可以用于过滤日期或电话号码。您需要将numberformatter
设置为TextField
,或者使用DocumentFilter(仅适用于JTextField)
检查此代码段,这就是使用DocumentFilter仅允许JTextField中的数字的方式,这是最有效的方式:
import java.awt.*;
import javax.swing.*;
import javax.swing.text.AbstractDocument;
import javax.swing.text.AttributeSet;
import javax.swing.text.BadLocationException;
import javax.swing.text.DocumentFilter;
import javax.swing.text.DocumentFilter.FilterBypass;
public class InputInteger
{
private JTextField tField;
private MyDocumentFilter documentFilter;
private void displayGUI()
{
JFrame frame = new JFrame("Input Integer Example");
frame.setDefaultCloseOperation(JFrame.DISPOSE_ON_CLOSE);
JPanel contentPane = new JPanel();
contentPane.setBorder(
BorderFactory.createEmptyBorder(5, 5, 5, 5));
tField = new JTextField(10);
((AbstractDocument)tField.getDocument()).setDocumentFilter(
new MyDocumentFilter());
contentPane.add(tField);
frame.setContentPane(contentPane);
frame.pack();
frame.setLocationByPlatform(true);
frame.setVisible(true);
}
public static void main(String[] args)
{
Runnable runnable = new Runnable()
{
@Override
public void run()
{
new InputInteger().displayGUI();
}
};
EventQueue.invokeLater(runnable);
}
}
class MyDocumentFilter extends DocumentFilter
{
@Override
public void insertString(DocumentFilter.FilterBypass fp
, int offset, String string, AttributeSet aset)
throws BadLocationException
{
int len = string.length();
boolean isValidInteger = true;
for (int i = 0; i < len; i++)
{
if (!Character.isDigit(string.charAt(i)))
{
isValidInteger = false;
break;
}
}
if (isValidInteger)
super.insertString(fp, offset, string, aset);
else
Toolkit.getDefaultToolkit().beep();
}
@Override
public void replace(DocumentFilter.FilterBypass fp, int offset
, int length, String string, AttributeSet aset)
throws BadLocationException
{
int len = string.length();
boolean isValidInteger = true;
for (int i = 0; i < len; i++)
{
if (!Character.isDigit(string.charAt(i)))
{
isValidInteger = false;
break;
}
}
if (isValidInteger)
super.replace(fp, offset, length, string, aset);
else
Toolkit.getDefaultToolkit().beep();
}
}
import java.awt.*;
导入javax.swing.*;
导入javax.swing.text.AbstractDocument;
导入javax.swing.text.AttributeSet;
导入javax.swing.text.BadLocationException;
导入javax.swing.text.DocumentFilter;
导入javax.swing.text.DocumentFilter.FilterBypass;
公共类输入整合器
{
私有JTextField;
私有MyDocumentFilter文档过滤器;
私有void displayGUI()
{
JFrame frame=新JFrame(“输入整数示例”);
frame.setDefaultCloseOperation(JFrame.DISPOSE_ON_CLOSE);
JPanel contentPane=新的JPanel();
contentPane.setOrder(
createEmptyByOrder(5,5,5,5));
tField=新的JTextField(10);
((AbstractDocument)tField.getDocument()).setDocumentFilter(
新建MyDocumentFilter());
contentPane.add(tField);
frame.setContentPane(contentPane);
frame.pack();
frame.setLocationByPlatform(真);
frame.setVisible(true);
}
公共静态void main(字符串[]args)
{
Runnable Runnable=新的Runnable()
{
@凌驾
公开募捐
{
新建InputIntegrater().displayGUI();
}
};
invokeLater(可运行);
}
}
类MyDocumentFilter扩展了DocumentFilter
{
@凌驾
public void insertString(DocumentFilter.FilterBypass fp
,整数偏移量,字符串,属性集(aset)
抛出BadLocationException
{
int len=string.length();
布尔值isValidInteger=true;
对于(int i=0;i