我注意到我必须点击＆＃34;输入＆＃34;每次我希望actionListener执行它的方法执行。我想在第二个用户在JTextField中输入任何类型的文本时执行操作。
这是代码......
import java.awt.*;
import java.awt.event.ActionEvent;
import java.awt.event.ActionListener;
import javax.swing.*;
import javax.swing.border.Border;
import javax.swing.border.TitledBorder;
public class TestGui extends JFrame {
//**************************************************************************************
// Variables
private int enterTxtInTextFieldFontSize = 16;
private int enterTxtInTextFieldWidth = 100;
private int enterTxtInTextFieldHeight = 40;
private JTextField enterTxtInTextField = createWhiteBoldFgDarkGreyBgFixedSizeAlignTextField("", enterTxtInTextFieldFontSize, enterTxtInTextFieldWidth, enterTxtInTextFieldHeight, SwingConstants.LEFT);;
private JLabel inputStringText = new JLabel("");
private JLabel inputIntText = new JLabel("");
private JPanel topFrame = createTopFrame();
private JScrollPane topFrameScroll = createTopScrollPane();
private JPanel centerFrame = createCenterFrame();
//**************************************************************************************
// Constructor
TestGui(){
add(topFrameScroll, BorderLayout.NORTH);
add(centerFrame, BorderLayout.CENTER);
setSize(1280,720);
setVisible(true);
setDefaultCloseOperation(JFrame.EXIT_ON_CLOSE);
}
//**************************************************************************************
// Support Methods
protected static boolean isInteger(String s) {
try {
Integer.parseInt(s);
} catch(NumberFormatException e) {
return false;
} catch(NullPointerException e) {
return false;
}
// String can be changed into an integer
return true;
}
private static GridBagConstraints setGbc(int gridx, int gridy, int gridWidth, int gridHeight, int ipadx, int ipady, String anchorLocation, double weightx, double weighty, Insets insets){
GridBagConstraints gbc = new GridBagConstraints();
if (anchorLocation.toUpperCase().equals("NORTHWEST")){
gbc.anchor = GridBagConstraints.NORTHWEST;
} else if (anchorLocation.toUpperCase().equals("NORTH")){
gbc.anchor = GridBagConstraints.NORTH;
} else if (anchorLocation.toUpperCase().equals("NORTHEAST")){
gbc.anchor = GridBagConstraints.NORTHEAST;
} else if (anchorLocation.toUpperCase().equals("WEST")){
gbc.anchor = GridBagConstraints.WEST;
} else if (anchorLocation.toUpperCase().equals("EAST")){
gbc.anchor = GridBagConstraints.EAST;
} else if (anchorLocation.toUpperCase().equals("SOUTHWEST")){
gbc.anchor = GridBagConstraints.SOUTHWEST;
} else if (anchorLocation.toUpperCase().equals("SOUTH")){
gbc.anchor = GridBagConstraints.SOUTH;
} else if (anchorLocation.toUpperCase().equals("SOUTHEAST")){
gbc.anchor = GridBagConstraints.SOUTHEAST;
} else {
gbc.anchor = GridBagConstraints.CENTER;
}
gbc.gridx = gridx; // column
gbc.gridy = gridy; // row
gbc.gridwidth = gridWidth; // number of columns
gbc.gridheight = gridHeight; // number of rows
gbc.ipadx = ipadx; // width of object
gbc.ipady = ipady; // height of object
gbc.weightx = weightx; // shifts rows to side of set anchor
gbc.weighty = weighty; // shifts columns to side of set anchor
gbc.insets = insets; // placement inside cell
gbc.fill = GridBagConstraints.HORIZONTAL;
gbc.fill = GridBagConstraints.VERTICAL;
return gbc;
}
private Insets setInsets(int top, int left, int bottom, int right){
Insets insets = new Insets(top,left,bottom,right);
return insets;
}
//**************************************************************************************
// Interactive Object Methods
private JTextField createWhiteBoldFgDarkGreyBgFixedSizeAlignTextField(String text, int textSize, int width, int height, int hAlign){
JTextField txtField = new JTextField(text);
txtField.setForeground(Color.WHITE);
txtField.setBackground(new Color(50,50,50));
txtField.setCaretColor(Color.CYAN);
txtField.setFont(new Font(text, Font.BOLD, textSize));
txtField.setPreferredSize(new Dimension(width, height));
txtField.setHorizontalAlignment(hAlign);
return txtField;
}
//**************************************************************************************
// Object Action Methods
private void setEnterTxtInTextFieldAction(){
enterTxtInTextField.addActionListener(
new ActionListener() {
public void actionPerformed(ActionEvent e) {
String textInTextField = enterTxtInTextField.getText();
if (isInteger(textInTextField)){
inputStringText.setText("");
inputIntText.setText(textInTextField);
} else {
inputIntText.setText("");
inputStringText.setText(textInTextField);
}
}
}
);
}
//**************************************************************************************
// Panel Methods
private JPanel createTopFrame(){
// pnl.add(object, setGbc(column,row, columnFill,rowFill, columnExtraWidth,columnExtraWidth, cellAlignment, weightColumn, weightRow, setInsets(top, left, bottom, right)));
JPanel pnl = new JPanel();
pnl.setLayout(new GridBagLayout());
Border gridBorder = BorderFactory.createMatteBorder(4,4,4,4,Color.BLUE);
JLabel enterText = new JLabel("Enter Text");
JLabel textIsString = new JLabel("Text Is String");
JLabel textIsInt = new JLabel("Text Is Int");
enterText.setBorder(gridBorder);
enterTxtInTextField.setBorder(gridBorder);
textIsString.setBorder(gridBorder);
inputStringText.setBorder(gridBorder);
textIsInt.setBorder(gridBorder);
inputIntText.setBorder(gridBorder);
setEnterTxtInTextFieldAction();
pnl.add(enterText, setGbc(0,0, 1,1, 0,0, "CENTER", 0, 0, setInsets(10, 10, 10, 10)));
pnl.add(enterTxtInTextField, setGbc(0,1, 1,1, 0,0, "CENTER", 0, 0, setInsets(10, 10, 10, 10)));
pnl.add(textIsString, setGbc(1,0, 1,1, 0,0, "CENTER", 0, 0, setInsets(10, 10, 10, 10)));
pnl.add(inputStringText, setGbc(1,1, 1,1, 0,0, "CENTER", 0, 0, setInsets(10, 10, 10, 10)));
pnl.add(textIsInt, setGbc(2,0, 1,1, 0,0, "CENTER", 0, 0, setInsets(10, 10, 10, 10)));
pnl.add(inputIntText, setGbc(2,1, 1,1, 0,0, "CENTER", 0, 0, setInsets(10, 10, 10, 10)));
pnl.setOpaque(false);
return pnl;
}
private JScrollPane createTopScrollPane(){
JScrollPane scrollPane = new JScrollPane();
Border raisedBevel = BorderFactory.createRaisedBevelBorder();
Border lineBorder = BorderFactory.createMatteBorder(2, 2, 2, 2, new Color(224,224,224));
Border loweredBevel = BorderFactory.createLoweredBevelBorder();
Border compoundSetup = BorderFactory.createCompoundBorder(raisedBevel, lineBorder);
Border compoundFinal = BorderFactory.createCompoundBorder(compoundSetup, loweredBevel);
scrollPane.setBorder(compoundFinal);
scrollPane.getViewport().setView(topFrame);
return scrollPane;
}
private JPanel createCenterFrame() {
JPanel pnl = new JPanel();
Border raisedBevel = BorderFactory.createRaisedBevelBorder();
Color lineColor = new Color(224, 224, 224);
Border lineBorder = BorderFactory.createMatteBorder(5, 5, 5, 5, lineColor);
Border loweredBevel = BorderFactory.createLoweredBevelBorder();
Border compoundSetup = BorderFactory.createCompoundBorder(raisedBevel, lineBorder);
Border compoundFinal = BorderFactory.createCompoundBorder(compoundSetup, loweredBevel);
TitledBorder topFrameTitle = BorderFactory.createTitledBorder(compoundFinal, "Stuff");
topFrameTitle.setTitleJustification(TitledBorder.CENTER);
pnl.setBorder(topFrameTitle);
pnl.setLayout(new GridBagLayout());
pnl.setOpaque(false);
return pnl;
}
//**************************************************************************************
public static void main(String[] args) {
new TestGui();
}
}
JTextField在第15行
上实例化addActionListener从＃106行开始
如果有人知道如何更新其他JLabel而无需先按＆＃34;输入＆＃34;，我将非常感谢帮助。谢谢:)）
答案 0 :(得分：0)
您需要改用 DocumentListener，然后相应地处理更改。将方法 setEnterTxtInTextFieldAction 更改为：
private void setEnterTxtInTextFieldAction(){
enterTxtInTextField.getDocument().addDocumentListener(new DocumentListener() {
@Override
public void insertUpdate(DocumentEvent documentEvent) {
performAction();
}
@Override
public void removeUpdate(DocumentEvent documentEvent) {
performAction();
}
@Override
public void changedUpdate(DocumentEvent documentEvent) {
}
});
enterTxtInTextField.addActionListener(
new ActionListener() {
public void actionPerformed(ActionEvent e) {
performAction();
}
}
);
}
private void performAction() {
String textInTextField = enterTxtInTextField.getText();
if (isInteger(textInTextField)){
inputStringText.setText("");
inputIntText.setText(textInTextField);
} else {
inputIntText.setText("");
inputStringText.setText(textInTextField);
}
}