Java FocusEvent不';无法获取JFormattedTextField的最后一个值,如何获取它?
在我的Java FocusEvent不';无法获取JFormattedTextField的最后一个值,如何获取它?,java,swing,jframe,jformattedtextfield,Java,Swing,Jframe,Jformattedtextfield,在我的JFrame对象上有两个JFormattedTextField对象。我想要通过这些JFormattedTextField对象的值进行基本的数学(加法)。我希望它发生在焦点丢失第一个或第二个文本字段时。但是当“focusLost()”事件没有得到最后一个值时,它会得到上一个值 比如,tf1首先有0,而tf2首先有0。我将2写入tf1,当focusLost()时,结果(tf1+tf2)仍然为0。当我更改其中任何一个时,结果变为2(上一个值) 如何获取focusLost上的最后一个值 这是我的密
JFrame
对象上有两个JFormattedTextField
对象。我想要通过这些JFormattedTextField
对象的值进行基本的数学(加法)。我希望它发生在焦点丢失第一个或第二个文本字段时。但是当“focusLost()
”事件没有得到最后一个值时,它会得到上一个值
比如,tf1
首先有0,而tf2
首先有0。我将2写入tf1
,当focusLost()
时,结果(tf1+tf2
)仍然为0。当我更改其中任何一个时,结果变为2(上一个值)
如何获取focusLost上的最后一个值
这是我的密码:
JFormattedTextField tf1,tf2;
NumberFormat format=NumberFormat.getNumberInstance();
tf1=new JFormattedTextField(format);
tf1.addFocusListener(this);
tf2=new JFormattedTextField(format);
tf2.addFocusListener(this);
和focusLost()
:
JFormattedTextField tf1、tf2中是否存在一些defalut Number值集 例如,对我来说,在没有NPE的情况下工作
import java.awt.*;
import java.awt.event.*;
import java.math.RoundingMode;
import java.text.NumberFormat;
import javax.swing.*;
import javax.swing.border.*;
import javax.swing.event.*;
public class FormatterLimit {
private JFrame frame = new JFrame();
private JPanel pnl = new JPanel();
private JLabel focusLabel = new JLabel(" focusLost Handle ");
private JFormattedTextField formTextField;
private JLabel docLabel = new JLabel(" document Handle ");
private JFormattedTextField formTextField1;
private NumberFormat formTextFieldFormat;
private double amount = 10000.00;
public FormatterLimit() {
formTextFieldFormat = NumberFormat.getNumberInstance();
formTextFieldFormat.setMinimumFractionDigits(2);
formTextFieldFormat.setMaximumFractionDigits(2);
formTextFieldFormat.setRoundingMode(RoundingMode.HALF_UP);
focusLabel.setFont(new Font("Serif", Font.BOLD, 14));
focusLabel.setForeground(Color.blue);
focusLabel.setPreferredSize(new Dimension(120, 27));
formTextField = new JFormattedTextField(formTextFieldFormat);
formTextField.setValue(amount);
formTextField.setFont(new Font("Serif", Font.BOLD, 22));
formTextField.setForeground(Color.black);
formTextField.setBackground(Color.yellow);
formTextField.setPreferredSize(new Dimension(120, 27));
formTextField.setHorizontalAlignment(SwingConstants.RIGHT);
formTextField.addFocusListener(new FocusListener() {
@Override
public void focusGained(FocusEvent e) {
formTextField.requestFocus();
formTextField.setText(formTextField.getText());
formTextField.selectAll();
}
@Override
public void focusLost(FocusEvent e) {
Runnable doRun = new Runnable() {
@Override
public void run() {
double t1a1 = (((Number) formTextField.getValue()).doubleValue());
if (t1a1 < 1000) {
formTextField.setValue(amount);
}
}
};
SwingUtilities.invokeLater(doRun);
}
});
docLabel.setFont(new Font("Serif", Font.BOLD, 14));
docLabel.setForeground(Color.blue);
docLabel.setPreferredSize(new Dimension(120, 27));
formTextField1 = new JFormattedTextField(formTextFieldFormat);
formTextField1.setValue(amount);
formTextField1.setFont(new Font("Serif", Font.BOLD, 22));
formTextField1.setForeground(Color.black);
formTextField1.setBackground(Color.yellow);
formTextField1.setPreferredSize(new Dimension(120, 27));
formTextField1.setHorizontalAlignment(SwingConstants.RIGHT);
formTextField1.addFocusListener(new FocusListener() {
@Override
public void focusGained(FocusEvent e) {
formTextField1.requestFocus();
formTextField1.setText(formTextField1.getText());
formTextField1.selectAll();
}
@Override
public void focusLost(FocusEvent e) {
}
});
formTextField1.getDocument().addDocumentListener(docListener);
pnl = new JPanel();
pnl.setBorder(new EmptyBorder(2, 2, 2, 2));
pnl.setLayout(new GridLayout(2, 2));
pnl.add(focusLabel);
pnl.add(formTextField);
pnl.add(docLabel);
pnl.add(formTextField1);
frame.setDefaultCloseOperation(JFrame.EXIT_ON_CLOSE);
frame.add(pnl, BorderLayout.CENTER);
frame.setLocation(200, 200);
frame.pack();
frame.setVisible(true);
formTextFieldFocus();
}
//
private DocumentListener docListener = new DocumentListener() {
@Override
public void changedUpdate(DocumentEvent documentEvent) {
printIt(documentEvent);
}
@Override
public void insertUpdate(DocumentEvent documentEvent) {
printIt(documentEvent);
}
@Override
public void removeUpdate(DocumentEvent documentEvent) {
printIt(documentEvent);
}
private void printIt(DocumentEvent documentEvent) {
DocumentEvent.EventType type = documentEvent.getType();
double t1a1 = (((Number) formTextField1.getValue()).doubleValue());
if (t1a1 < 1000) {
Runnable doRun = new Runnable() {
@Override
public void run() {
formTextField1.setValue(amount);
}
};
SwingUtilities.invokeLater(doRun);
}
}
};
public void formTextFieldFocus1() {
Runnable doRun = new Runnable() {
@Override
public void run() {
formTextField1.grabFocus();
formTextField1.requestFocus();
formTextField1.setText(formTextField1.getText());
formTextField1.selectAll();
}
};
SwingUtilities.invokeLater(doRun);
}
public void formTextFieldFocus() {
Runnable doRun = new Runnable() {
@Override
public void run() {
formTextField.grabFocus();
formTextField.requestFocus();
formTextField.setText(formTextField.getText());
formTextField.selectAll();
formTextFieldFocus1();
}
};
SwingUtilities.invokeLater(doRun);
}
public static void main(String args[]) {
EventQueue.invokeLater(new Runnable() {
@Override
public void run() {
FormatterLimit fl = new FormatterLimit();
}
});
}
}
import java.awt.*;
导入java.awt.event.*;
导入java.math.RoundingMode;
导入java.text.NumberFormat;
导入javax.swing.*;
导入javax.swing.border.*;
导入javax.swing.event.*;
公共类格式化程序限制{
私有JFrame=新JFrame();
private JPanel pnl=new JPanel();
专用JLabel focusLabel=新JLabel(“focusLost句柄”);
私有JFormattedTextField formTextField;
私有JLabel docLabel=新JLabel(“文档句柄”);
私有JFormattedTextFieldFormTextField1;
私有数字格式formTextFieldFormat;
私人双倍金额=10000.00;
公共格式化程序限制(){
formTextFieldFormat=NumberFormat.getNumberInstance();
formTextFieldFormat.setMinimumFractionDigits(2);
formTextFieldFormat.setMaximumFractionDigits(2);
formTextFieldFormat.setRoundingMode(RoundingMode.HALF_UP);
setFont(新字体(“衬线”,Font.BOLD,14));
focusLabel.setForeground(颜色:蓝色);
focusLabel.setPreferredSize(新尺寸(120,27));
formTextField=新的JFormattedTextField(formTextFieldFormat);
formTextField.setValue(金额);
setFont(新字体(“衬线”,Font.BOLD,22));
formTextField.setForeground(颜色为黑色);
formTextField.setBackground(颜色:黄色);
setPreferredSize(新维度(120,27));
formTextField.setHorizontalAlignment(SwingConstants.RIGHT);
addFocusListener(新FocusListener()){
@凌驾
获得公共无效焦点(焦点事件e){
formTextField.requestFocus();
formTextField.setText(formTextField.getText());
formTextField.selectAll();
}
@凌驾
公共无效焦点丢失(焦点事件e){
Runnable doRun=new Runnable(){
@凌驾
公开募捐{
double t1a1=((数字)formTextField.getValue()).doubleValue());
如果(t1a1<1000){
formTextField.setValue(金额);
}
}
};
SwingUtilities.invokeLater(多伦);
}
});
docLabel.setFont(新字体(“衬线”,Font.BOLD,14));
docLabel.setForeground(颜色:蓝色);
docLabel.setPreferredSize(新尺寸(120,27));
formTextField1=新的JFormattedTextField(formTextFieldFormat);
formTextField1.设置值(金额);
formTextField1.setFont(新字体(“衬线”,Font.BOLD,22));
formTextField1.设置前景(颜色为黑色);
formTextField1.挫折背景(颜色:黄色);
formTextField1.setPreferredSize(新维度(120,27));
formTextField1.设置水平对齐(SwingConstants.右);
formTextField1.addFocusListener(新FocusListener(){
@凌驾
获得公共无效焦点(焦点事件e){
formTextField1.requestFocus();
formTextField1.setText(formTextField1.getText());
formTextField1.selectAll();
}
@凌驾
公共无效焦点丢失(焦点事件e){
}
});
formTextField1.getDocument().addDocumentListener(docListener);
pnl=新的JPanel();
pnl.setboorder(新的空订单(2,2,2,2));
pnl.setLayout(新网格布局(2,2));
pnl.add(焦点标签);
pnl.add(formTextField);
pnl.add(docLabel);
pnl.add(formTextField1);
frame.setDefaultCloseOperation(JFrame.EXIT_ON_CLOSE);
frame.add(pnl,BorderLayout.CENTER);
帧设置位置(200200);
frame.pack();
frame.setVisible(true);
formTextFieldFocus();
}
//
私有DocumentListener docListener=新DocumentListener(){
@凌驾
public void changedUpdate(DocumentEvent DocumentEvent){
printIt(documentEvent);
}
@凌驾
公共作废插入更新(DocumentEvent DocumentEvent){
printIt(documentEvent);
}
@凌驾
公共作废移除更新(DocumentEvent DocumentEvent){
printIt(documentEvent);
}
private void printIt(DocumentEvent DocumentEvent){
DocumentEvent.EventType类型=DocumentEvent.getType();
double t1a1=((数字)formTextField1.getValue()).doubleValue());
如果(t1a1<1000){
Runnable doRun=new Runnable(){
@凌驾
公开募捐{
formTextField1.设置值(金额);
}
};
SwingUtilities.invokeLater(多伦);
}
}
};
公共无效formTextFieldFocus1(){
Runnable doRun=new Runnable(){
@凌驾
公开募捐{
formTextField1.grabFocus();
formTextField1.requestFocus(
import java.awt.*;
import java.awt.event.*;
import java.math.RoundingMode;
import java.text.NumberFormat;
import javax.swing.*;
import javax.swing.border.*;
import javax.swing.event.*;
public class FormatterLimit {
private JFrame frame = new JFrame();
private JPanel pnl = new JPanel();
private JLabel focusLabel = new JLabel(" focusLost Handle ");
private JFormattedTextField formTextField;
private JLabel docLabel = new JLabel(" document Handle ");
private JFormattedTextField formTextField1;
private NumberFormat formTextFieldFormat;
private double amount = 10000.00;
public FormatterLimit() {
formTextFieldFormat = NumberFormat.getNumberInstance();
formTextFieldFormat.setMinimumFractionDigits(2);
formTextFieldFormat.setMaximumFractionDigits(2);
formTextFieldFormat.setRoundingMode(RoundingMode.HALF_UP);
focusLabel.setFont(new Font("Serif", Font.BOLD, 14));
focusLabel.setForeground(Color.blue);
focusLabel.setPreferredSize(new Dimension(120, 27));
formTextField = new JFormattedTextField(formTextFieldFormat);
formTextField.setValue(amount);
formTextField.setFont(new Font("Serif", Font.BOLD, 22));
formTextField.setForeground(Color.black);
formTextField.setBackground(Color.yellow);
formTextField.setPreferredSize(new Dimension(120, 27));
formTextField.setHorizontalAlignment(SwingConstants.RIGHT);
formTextField.addFocusListener(new FocusListener() {
@Override
public void focusGained(FocusEvent e) {
formTextField.requestFocus();
formTextField.setText(formTextField.getText());
formTextField.selectAll();
}
@Override
public void focusLost(FocusEvent e) {
Runnable doRun = new Runnable() {
@Override
public void run() {
double t1a1 = (((Number) formTextField.getValue()).doubleValue());
if (t1a1 < 1000) {
formTextField.setValue(amount);
}
}
};
SwingUtilities.invokeLater(doRun);
}
});
docLabel.setFont(new Font("Serif", Font.BOLD, 14));
docLabel.setForeground(Color.blue);
docLabel.setPreferredSize(new Dimension(120, 27));
formTextField1 = new JFormattedTextField(formTextFieldFormat);
formTextField1.setValue(amount);
formTextField1.setFont(new Font("Serif", Font.BOLD, 22));
formTextField1.setForeground(Color.black);
formTextField1.setBackground(Color.yellow);
formTextField1.setPreferredSize(new Dimension(120, 27));
formTextField1.setHorizontalAlignment(SwingConstants.RIGHT);
formTextField1.addFocusListener(new FocusListener() {
@Override
public void focusGained(FocusEvent e) {
formTextField1.requestFocus();
formTextField1.setText(formTextField1.getText());
formTextField1.selectAll();
}
@Override
public void focusLost(FocusEvent e) {
}
});
formTextField1.getDocument().addDocumentListener(docListener);
pnl = new JPanel();
pnl.setBorder(new EmptyBorder(2, 2, 2, 2));
pnl.setLayout(new GridLayout(2, 2));
pnl.add(focusLabel);
pnl.add(formTextField);
pnl.add(docLabel);
pnl.add(formTextField1);
frame.setDefaultCloseOperation(JFrame.EXIT_ON_CLOSE);
frame.add(pnl, BorderLayout.CENTER);
frame.setLocation(200, 200);
frame.pack();
frame.setVisible(true);
formTextFieldFocus();
}
//
private DocumentListener docListener = new DocumentListener() {
@Override
public void changedUpdate(DocumentEvent documentEvent) {
printIt(documentEvent);
}
@Override
public void insertUpdate(DocumentEvent documentEvent) {
printIt(documentEvent);
}
@Override
public void removeUpdate(DocumentEvent documentEvent) {
printIt(documentEvent);
}
private void printIt(DocumentEvent documentEvent) {
DocumentEvent.EventType type = documentEvent.getType();
double t1a1 = (((Number) formTextField1.getValue()).doubleValue());
if (t1a1 < 1000) {
Runnable doRun = new Runnable() {
@Override
public void run() {
formTextField1.setValue(amount);
}
};
SwingUtilities.invokeLater(doRun);
}
}
};
public void formTextFieldFocus1() {
Runnable doRun = new Runnable() {
@Override
public void run() {
formTextField1.grabFocus();
formTextField1.requestFocus();
formTextField1.setText(formTextField1.getText());
formTextField1.selectAll();
}
};
SwingUtilities.invokeLater(doRun);
}
public void formTextFieldFocus() {
Runnable doRun = new Runnable() {
@Override
public void run() {
formTextField.grabFocus();
formTextField.requestFocus();
formTextField.setText(formTextField.getText());
formTextField.selectAll();
formTextFieldFocus1();
}
};
SwingUtilities.invokeLater(doRun);
}
public static void main(String args[]) {
EventQueue.invokeLater(new Runnable() {
@Override
public void run() {
FormatterLimit fl = new FormatterLimit();
}
});
}
}
//...where initialization occurs:
double amount;
JFormattedTextField amountField;
...
amountField.addPropertyChangeListener("value",
new FormattedTextFieldListener());
...
class FormattedTextFieldListener implements PropertyChangeListener {
public void propertyChanged(PropertyChangeEvent e) {
Object source = e.getSource();
if (source == amountField) {
amount = ((Number)amountField.getValue()).doubleValue();
...
}
...//re-compute payment and update field...
}
}
import java.awt.EventQueue;
import java.awt.GridLayout;
import java.awt.event.FocusAdapter;
import java.awt.event.FocusEvent;
import java.text.NumberFormat;
import javax.swing.JFormattedTextField;
import javax.swing.JFrame;
import javax.swing.JPanel;
/** @see http://stackoverflow.com/questions/6803976 */
public class Adder extends JPanel {
private final NumberFormat format = NumberFormat.getNumberInstance();
private final JFormattedTextField a = new JFormattedTextField(format);
private final JFormattedTextField b = new JFormattedTextField(format);
private final JFormattedTextField sum = new JFormattedTextField(format);
public Adder() {
this.setLayout(new GridLayout(0, 1));
this.add(init(a));
this.add(init(b));
sum.setEditable(false);
sum.setFocusable(false);
this.add(sum);
}
private JFormattedTextField init(JFormattedTextField jtf) {
jtf.setValue(0);
jtf.addFocusListener(new FocusAdapter() {
@Override
public void focusLost(FocusEvent e) {
EventQueue.invokeLater(new Runnable() {
@Override
public void run() {
Number v1 = (Number) a.getValue();
Number v2 = (Number) b.getValue();
sum.setValue(v1.longValue() + v2.longValue());
}
});
}
});
return jtf;
}
private void display() {
JFrame f = new JFrame("Adder");
f.setDefaultCloseOperation(JFrame.EXIT_ON_CLOSE);
f.add(this);
f.pack();
f.setLocationRelativeTo(null);
f.setVisible(true);
}
public static void main(String[] args) {
EventQueue.invokeLater(new Runnable() {
@Override
public void run() {
new Adder().display();
}
});
}
}