Java 如何从keyevent方法调用textfield变量？
好的，我正在做一个GUI程序，我很难检索用户将输入的信息，并从另一个类调用它，以便在那里访问它。以下是我的GUI类的主要部分，它从创建第一个文本字段开始：Java 如何从keyevent方法调用textfield变量？,java,swing,user-interface,methods,key-events,Java,Swing,User Interface,Methods,Key Events,好的，我正在做一个GUI程序，我很难检索用户将输入的信息，并从另一个类调用它，以便在那里访问它。以下是我的GUI类的主要部分，它从创建第一个文本字段开始： /** *Text genereted by Simple GUI Extension for BlueJ */ import javax.swing.UIManager.LookAndFeelInfo; import java.awt.*; import java.awt.event.ActionEvent; import java.awt
/**
*Text genereted by Simple GUI Extension for BlueJ
*/
import javax.swing.UIManager.LookAndFeelInfo;
import java.awt.*;
import java.awt.event.ActionEvent;
import java.awt.event.ActionListener;
import java.awt.event.KeyAdapter;
import java.awt.event.KeyEvent;
import java.awt.event.MouseAdapter;
import java.awt.event.MouseEvent;
import java.awt.event.MouseWheelEvent;
import java.awt.event.MouseWheelListener;
import javax.swing.border.Border;
import javax.swing.*;
public class GUI_project extends JFrame {
private JMenuBar menuBar;
private JButton button1;
private JLabel label1;
private JLabel label2;
private JLabel label3;
private JLabel label4;
private JTextField textfield1;
private JTextField textfield2;
private JTextField textfield3;
public String SoftName;
public String ReportName;
public String Devices;
public int InDevices;
//Constructor
public GUI_project(){
setTitle("Software Calculator");
setSize(500,400);
//menu generate method
generateMenu();
setJMenuBar(menuBar);
//pane with null layout
JPanel contentPane = new JPanel(null);
contentPane.setPreferredSize(new Dimension(500,400));
contentPane.setBackground(new Color(51,153,0));
button1 = new JButton();
button1.setBounds(180,325,150,35);
button1.setBackground(new Color(214,217,223));
button1.setForeground(new Color(0,0,0));
button1.setEnabled(true);
button1.setFont(new Font("sansserif",0,12));
button1.setText("Calculate and Save");
button1.setVisible(true);
//Set action for key events
//Call defined method
button1.addActionListener(new ActionListener() {
public void actionPerformed(ActionEvent evt) {
startApp(evt);
}
});
label1 = new JLabel();
label1.setBounds(95,12,300,35);
label1.setBackground(new Color(214,217,223));
label1.setForeground(new Color(0,0,0));
label1.setEnabled(true);
label1.setFont(new Font("SansSerif",0,20));
label1.setText("Software Agreement Calcuator");
label1.setVisible(true);
label2 = new JLabel();
label2.setBounds(18,102,150,35);
label2.setBackground(new Color(214,217,223));
label2.setForeground(new Color(0,0,0));
label2.setEnabled(true);
label2.setFont(new Font("SansSerif",0,16));
label2.setText("Name of Software:");
label2.setVisible(true);
label3 = new JLabel();
label3.setBounds(15,174,300,35);
label3.setBackground(new Color(214,217,223));
label3.setForeground(new Color(0,0,0));
label3.setEnabled(true);
label3.setFont(new Font("SansSerif",0,16));
label3.setText("Number of Devices the Software is on:");
label3.setVisible(true);
label4 = new JLabel();
label4.setBounds(17,244,250,35);
label4.setBackground(new Color(214,217,223));
label4.setForeground(new Color(0,0,0));
label4.setEnabled(true);
label4.setFont(new Font("SansSerif",0,15));
label4.setText("Name of Report to Save Under:");
label4.setVisible(true);
textfield1 = new JTextField();
textfield1.setBounds(335,102,90,35);
textfield1.setBackground(new Color(255,255,255));
textfield1.setForeground(new Color(0,0,0));
textfield1.setEnabled(true);
textfield1.setFont(new Font("sansserif",0,12));
textfield1.setText("");
textfield1.setVisible(true);
//Set action for key events
//Call defined method
textfield1.addKeyListener(new KeyAdapter() {
public void keyTyped(KeyEvent evt) {
getSoftwareName(evt);
}
});
textfield2 = new JTextField();
textfield2.setBounds(335,173,90,35);
textfield2.setBackground(new Color(255,255,255));
textfield2.setForeground(new Color(0,0,0));
textfield2.setEnabled(true);
textfield2.setFont(new Font("sansserif",0,12));
textfield2.setText("");
textfield2.setVisible(true);
//Set action for key events
//Call defined method
textfield2.addKeyListener(new KeyAdapter() {
public void keyTyped(KeyEvent evt) {
number(evt);
}
});
textfield3 = new JTextField();
textfield3.setBounds(336,240,90,35);
textfield3.setBackground(new Color(255,255,255));
textfield3.setForeground(new Color(0,0,0));
textfield3.setEnabled(true);
textfield3.setFont(new Font("sansserif",0,12));
textfield3.setText("");
textfield3.setVisible(true);
//Set action for key events
//Call defined method
textfield3.addKeyListener(new KeyAdapter() {
public void keyTyped(KeyEvent evt) {
FileName(evt);
}
});
//adding components to contentPane panel
contentPane.add(button1);
contentPane.add(label1);
contentPane.add(label2);
contentPane.add(label3);
contentPane.add(label4);
contentPane.add(textfield1);
contentPane.add(textfield2);
contentPane.add(textfield3);
//adding panel to JFrame and seting of window position and close operation
getContentPane().add(contentPane);
setDefaultCloseOperation(JFrame.EXIT_ON_CLOSE);
setLocationRelativeTo(null);
pack();
setVisible(true);
}
//Method keyPressed for button1
public void startApp (ActionEvent evt) {
Print.Start();
}
//Method actionPerformed for textfield1
public String getSoftwareName (KeyEvent evt) {
SoftName = textfield1.getText();
return SoftName;
}
//Method actionPerformed for textfield2
public int number (KeyEvent evt) {
char c=evt.getKeyChar();
if(!(Character.isDigit(c) || (c==KeyEvent.VK_BACK_SPACE)||c==KeyEvent.VK_DELETE)){
evt.consume();
}
this.Devices= this.textfield2.getText();
InDevices= Integer.parseInt(Devices);
return InDevices;
}
//Method actionPerformed for textfield3
public String FileName (KeyEvent evt) {
this.ReportName= this.textfield3.getText();
return ReportName;
}
//method for generate menu
public void generateMenu(){
menuBar = new JMenuBar();
JMenu file = new JMenu("File");
JMenuItem open = new JMenuItem("Open ");
open.setAccelerator(KeyStroke.getKeyStroke(KeyEvent.VK_O,Event.CTRL_MASK));
JMenuItem exit = new JMenuItem("Exit ");
exit.setAccelerator(KeyStroke.getKeyStroke(KeyEvent.VK_Q,Event.CTRL_MASK));
//Setings action for menu item
//Call defined method
open.addActionListener(new ActionListener() {
public void actionPerformed(ActionEvent evt) {
openFile(evt);
}
});
//Setings action for menu item
//Call defined method
exit.addActionListener(new ActionListener() {
public void actionPerformed(ActionEvent evt) {
Quit(evt);
}
});
file.add(open);
file.add(exit);
menuBar.add(file);
}
//Method for Open from menuFile
private void openFile (ActionEvent evt) {
PopUp Pop= new PopUp();
Pop.Frame();
}
//Method for Exit from menuFile
private void Quit (ActionEvent evt) {
System.exit(0);
}
public static void main(String[] args){
System.setProperty("swing.defaultlaf", "com.sun.java.swing.plaf.nimbus.NimbusLookAndFeel");
javax.swing.SwingUtilities.invokeLater(new Runnable() {
public void run() {
new GUI_project();
}
});
}
public static int software;
public static String name;
public static void Company(){
GUI_project main= new GUI_project();
name=main.getSoftwareName();
if(name.equals("Microsoft")||name.equals("Norton")||name.equals("Oracle")||name.equals("CRM")){
if(name.equals("Microsoft")){
Name.software = 1200000;
}else if(name.equals("Norton")){
Name.software = 3000000;
}else if(name.equals("Oracle")){
Name.software = 1700000;
}else if(name.equals("CRM")){
Name.software = 2300000;
}
}else{
System.out.println("Not a company, GOOD BYE!");
System.exit(0);
}
}
我相信这是一个愚蠢的错误，但是任何帮助都是很好的。一旦我能够让这两个类工作，其余的应该以同样的方式工作：）尝试下面的代码 Test.java
import javax.swing.*;
import java.awt.*;
import javax.swing.event.*;
public class Test
{
JFrame myMainWindow = new JFrame("This is my title");
JPanel firstPanel = new JPanel(null);
JTextField textfield1 = new JTextField();
public void runGUI() {
myMainWindow.setBounds(10, 10, 500, 500);
myMainWindow.setDefaultCloseOperation(JFrame.EXIT_ON_CLOSE);
myMainWindow.setLayout(new GridLayout(1,1));
createFirstPanel();
myMainWindow.getContentPane().add(firstPanel);
myMainWindow.setVisible(true);
}
public void createFirstPanel() {
textfield1.setBounds(335,102,90,35);
textfield1.setBackground(new Color(255,255,255));
textfield1.setForeground(new Color(0,0,0));
textfield1.setEnabled(true);
textfield1.setFont(new Font("sansserif",0,12));
textfield1.setVisible(true);
textfield1.getDocument().addDocumentListener(new MyDocumentListener());
firstPanel.add(textfield1);
}
private class MyDocumentListener implements DocumentListener {
public void insertUpdate(DocumentEvent e) {
new Class2(textfield1.getText());
}
public void removeUpdate(DocumentEvent e) {
new Class2(textfield1.getText());
}
public void changedUpdate(DocumentEvent e) {}
}
public static void main(String[] args)
{
Test t = new Test();
t.runGUI();
}
}
public class Class2 {
int software;
public Class2(String s) {
Company(s);
System.out.println(s);
System.out.println(software);
}
public void Company(String s) {
if(s.equals("Microsoft")||s.equals("Norton")||s.equals("Oracle")||s.equals("CRM")){
if(s.equals("Microsoft")) {
software = 1200000;
System.out.println("Matches Microsoft");
} else if(s.equals("Norton")) {
software = 3000000;
System.out.println("Matches Norton");
} else if(s.equals("Oracle")) {
software = 1700000;
System.out.println("Matches Oracle");
} else if(s.equals("CRM")) {
software = 2300000;
System.out.println("Matches CRM");
}
} else {
System.out.println("Not a company, GOOD BYE!");
}
}
}
import javax.swing.*;
import java.awt.*;
import javax.swing.event.*;
public class Test
{
JFrame myMainWindow = new JFrame("This is my title");
JPanel firstPanel = new JPanel(null);
JTextField textfield1 = new JTextField();
public void runGUI() {
myMainWindow.setBounds(10, 10, 500, 500);
myMainWindow.setDefaultCloseOperation(JFrame.EXIT_ON_CLOSE);
myMainWindow.setLayout(new GridLayout(1,1));
createFirstPanel();
myMainWindow.getContentPane().add(firstPanel);
myMainWindow.setVisible(true);
}
public void createFirstPanel() {
textfield1.setBounds(335,102,90,35);
textfield1.setBackground(new Color(255,255,255));
textfield1.setForeground(new Color(0,0,0));
textfield1.setEnabled(true);
textfield1.setFont(new Font("sansserif",0,12));
textfield1.setVisible(true);
textfield1.getDocument().addDocumentListener(new MyDocumentListener());
firstPanel.add(textfield1);
}
private class MyDocumentListener implements DocumentListener {
public void insertUpdate(DocumentEvent e) {
new Class2(textfield1.getText());
}
public void removeUpdate(DocumentEvent e) {
new Class2(textfield1.getText());
}
public void changedUpdate(DocumentEvent e) {}
}
public static void main(String[] args)
{
Test t = new Test();
t.runGUI();
}
}
public class Class2 {
int software;
public Class2(String s) {
Company(s);
System.out.println(s);
System.out.println(software);
}
public void Company(String s) {
if(s.equals("Microsoft")||s.equals("Norton")||s.equals("Oracle")||s.equals("CRM")){
if(s.equals("Microsoft")) {
software = 1200000;
System.out.println("Matches Microsoft");
} else if(s.equals("Norton")) {
software = 3000000;
System.out.println("Matches Norton");
} else if(s.equals("Oracle")) {
software = 1700000;
System.out.println("Matches Oracle");
} else if(s.equals("CRM")) {
software = 2300000;
System.out.println("Matches CRM");
}
} else {
System.out.println("Not a company, GOOD BYE!");
}
}
}
KeyAdapterdocumentlistenerKeyAdaptertextfield1文档监听器Test.java中输入以下代码即可
导入javax.swing。；
导入java.awt。；
导入javax.swing.event。；
导入java.awt.event
您可以使用列表界面来改进第二个类的代码
List <String> companyList = new ArrayList<String>();
companyList.add("Microsoft");
companyList.add("Norton");
companyList.add("Oracle");
companyList.add("CRM");
int index=companyList.indexOf(name);
switch(index){
case 0: Name.software = 1200000;break;
case 1: Name.software = 3000000;break;
case 2: Name.software = 1700000;break;
case 3: Name.software = 2300000;break;
case -1: //-1 Signifies it did not match the company names
}
List companyList=new ArrayList（）；
公司列表添加（“微软”）；
公司列表添加（“诺顿”）；
公司列表添加（“甲骨文”）；
公司列表添加（“CRM”）；
int index=companyList.indexOf（名称）；
开关（索引）{
案例0:Name.software=1200000；中断；
案例1:Name.software=3000000；中断；
案例2:Name.software=1700000；中断；
案例3:Name.software=2300000；中断；
案例-1://-1表示它与公司名称不匹配
}
好的，基于此
GUI_project main= new GUI_project();
name=main.getSoftwareName();
用户与表单交互后，您似乎希望获得softwareName
在这种情况下，您有三种选择，您可以使用某种类型的，当某种操作发生时，GUI\u项目
将向任何相关方发送某种事件（例如，用户按下“确定”按钮）
或者，您可以使用一个对话框，它将在对话框可见时停止代码的执行，直到对话框关闭，此时您可以访问所需的信息
或者你应该直接将第二个类需要的信息传递给它
第二种方法是更常见的方法和更“线性”的方法，这似乎适合您的代码
但是，在我们激动之前，做些家务
- 避免使用
null
布局，像素完美的布局在现代ui设计中是一种错觉。影响零部件单个尺寸的因素太多，您无法控制。Swing的设计初衷是与布局管理器一起工作，丢弃这些布局管理器将导致无止境的问题，您将花费越来越多的时间来纠正这些问题
- 一般来说，避免使用
KeyListener
，但特别是对于文本组件，它们是非常不合适的，事实上，在您的情况下，ActionListener
会更好。有关详细信息，请参阅和
- 如果在将文本输入到字段时需要提供特殊处理，则应使用
DocumentListener
，有关更多详细信息，请参阅。如果要在字段上提供实时验证，则应使用“DocumentFilter”，有关详细信息，请参阅和
作为一个概念性的想法
import java.awt.Color;
import java.awt.Dimension;
import java.awt.Event;
import java.awt.EventQueue;
import java.awt.Font;
import java.awt.GridBagConstraints;
import java.awt.GridBagLayout;
import java.awt.event.ActionEvent;
import java.awt.event.ActionListener;
import java.awt.event.KeyEvent;
import javax.swing.JButton;
import javax.swing.JFrame;
import javax.swing.JLabel;
import javax.swing.JMenu;
import javax.swing.JMenuBar;
import javax.swing.JMenuItem;
import javax.swing.JPanel;
import javax.swing.JTextField;
import javax.swing.KeyStroke;
import javax.swing.SwingUtilities;
import javax.swing.UIManager;
import javax.swing.UnsupportedLookAndFeelException;
public class Test {
public static void main(String[] args) {
new Test();
}
public Test() {
EventQueue.invokeLater(new Runnable() {
@Override
public void run() {
try {
UIManager.setLookAndFeel(UIManager.getSystemLookAndFeelClassName());
} catch (ClassNotFoundException | InstantiationException | IllegalAccessException | UnsupportedLookAndFeelException ex) {
ex.printStackTrace();
}
GUI_project project = new GUI_project();
JFrame frame = new JFrame("Testing");
frame.setDefaultCloseOperation(JFrame.EXIT_ON_CLOSE);
frame.setJMenuBar(project.generateMenu());
frame.add(project);
frame.pack();
frame.setLocationRelativeTo(null);
frame.setVisible(true);
}
});
}
public class GUI_project extends JPanel {
private JButton button1;
private JLabel label1;
private JLabel label2;
private JLabel label3;
private JLabel label4;
private JTextField textfield1;
private JTextField textfield2;
private JTextField textfield3;
public String SoftName;
public String ReportName;
public String Devices;
public int InDevices;
public GUI_project() {
generateMenu();
//pane with null layout
setBackground(new Color(51, 153, 0));
button1 = new JButton();
button1.setBackground(new Color(214, 217, 223));
button1.setForeground(new Color(0, 0, 0));
button1.setEnabled(true);
button1.setFont(new Font("sansserif", 0, 12));
button1.setText("Calculate and Save");
button1.setVisible(true);
//Set action for key events
//Call defined method
button1.addActionListener(new ActionListener() {
public void actionPerformed(ActionEvent evt) {
startApp(evt);
}
});
label1 = new JLabel();
label1.setBackground(new Color(214, 217, 223));
label1.setForeground(new Color(0, 0, 0));
label1.setEnabled(true);
label1.setFont(new Font("SansSerif", 0, 20));
label1.setText("Software Agreement Calcuator");
label1.setVisible(true);
label2 = new JLabel();
label2.setBackground(new Color(214, 217, 223));
label2.setForeground(new Color(0, 0, 0));
label2.setEnabled(true);
label2.setFont(new Font("SansSerif", 0, 16));
label2.setText("Name of Software:");
label2.setVisible(true);
label3 = new JLabel();
label3.setBackground(new Color(214, 217, 223));
label3.setForeground(new Color(0, 0, 0));
label3.setEnabled(true);
label3.setFont(new Font("SansSerif", 0, 16));
label3.setText("Number of Devices the Software is on:");
label3.setVisible(true);
label4 = new JLabel();
label4.setBackground(new Color(214, 217, 223));
label4.setForeground(new Color(0, 0, 0));
label4.setEnabled(true);
label4.setFont(new Font("SansSerif", 0, 15));
label4.setText("Name of Report to Save Under:");
label4.setVisible(true);
textfield1 = new JTextField(10);
textfield1.setBackground(new Color(255, 255, 255));
textfield1.setForeground(new Color(0, 0, 0));
textfield1.setEnabled(true);
textfield1.setFont(new Font("sansserif", 0, 12));
textfield1.setText("");
textfield1.setVisible(true);
textfield2 = new JTextField(10);
textfield2.setBackground(new Color(255, 255, 255));
textfield2.setForeground(new Color(0, 0, 0));
textfield2.setEnabled(true);
textfield2.setFont(new Font("sansserif", 0, 12));
textfield2.setText("");
textfield2.setVisible(true);
//Set action for key events
//Call defined method
textfield3 = new JTextField(10);
textfield3.setBackground(new Color(255, 255, 255));
textfield3.setForeground(new Color(0, 0, 0));
textfield3.setEnabled(true);
textfield3.setFont(new Font("sansserif", 0, 12));
textfield3.setText("");
textfield3.setVisible(true);
//Set action for key events
//Call defined method
//adding components to contentPane panel
setLayout(new GridBagLayout());
GridBagConstraints gbc = new GridBagConstraints();
gbc.gridwidth = GridBagConstraints.REMAINDER;
gbc.gridx = 0;
gbc.gridy = 0;
add(label1, gbc);
gbc.anchor = GridBagConstraints.EAST;
gbc.gridy++;
gbc.gridwidth = 1;
add(label2, gbc);
gbc.gridy++;
add(label3, gbc);
gbc.gridy++;
add(label4, gbc);
gbc.anchor = GridBagConstraints.WEST;
gbc.gridy = 1;
gbc.gridx++;
add(textfield1, gbc);
gbc.gridy++;
add(textfield2, gbc);
gbc.gridy++;
add(textfield3, gbc);
gbc.gridy++;
gbc.gridx = 0;
gbc.anchor = gbc.EAST;
gbc.gridwidth = GridBagConstraints.REMAINDER;
add(button1, gbc);
}
@Override
public Dimension getPreferredSize() {
return new Dimension(500, 400);
}
public JMenuBar generateMenu() {
JMenuBar menuBar = new JMenuBar();
JMenu file = new JMenu("File");
JMenuItem open = new JMenuItem("Open ");
open.setAccelerator(KeyStroke.getKeyStroke(KeyEvent.VK_O, Event.CTRL_MASK));
JMenuItem exit = new JMenuItem("Exit ");
exit.setAccelerator(KeyStroke.getKeyStroke(KeyEvent.VK_Q, Event.CTRL_MASK));
//Setings action for menu item
//Call defined method
open.addActionListener(new ActionListener() {
public void actionPerformed(ActionEvent evt) {
openFile(evt);
}
});
//Setings action for menu item
//Call defined method
exit.addActionListener(new ActionListener() {
public void actionPerformed(ActionEvent evt) {
Quit(evt);
}
});
file.add(open);
file.add(exit);
menuBar.add(file);
return menuBar;
}
public void startApp(ActionEvent evt) {
Popup pop = new Popup(textfield1.getText());
// And what ever you need to do
}
private void openFile(ActionEvent evt) {
}
private void Quit(ActionEvent evt) {
SwingUtilities.windowForComponent(this).dispose();
}
}
public class Popup {
private int type;
public Popup(String softwareName) {
if (softwareName.equals("Microsoft") || softwareName.equals("Norton") || softwareName.equals("Oracle") || softwareName.equals("CRM")) {
if (softwareName.equals("Microsoft")) {
type = 1200000;
} else if (softwareName.equals("Norton")) {
type = 3000000;
} else if (softwareName.equals("Oracle")) {
type = 1700000;
} else if (softwareName.equals("CRM")) {
type = 2300000;
}
}
}
}
}
添加GUI\u项目
类的完整代码。我刚刚上传的完整代码实际上没有回答他的问题，但这是一个很好的观点，可以改进他的代码。它可以使其更容易，但我不想使用数组，因为代码要复杂得多，并且包含7个其他类。。这7个类中只有3个将使用GUI类从中检索其信息，但目前仅尝试合并上述类是不够的great@HusseinOkasha数组列表
与数组
不同。字符串[]
中的主要区别通常必须定义其大小=新字符串[8]
，而数组列表不定义。在许多情况下，ArrayList
可能更有用。如果你和他们一起工作的话，一定要记住这一点