Java 使用e.getsource打开新窗口（JFrame）
我在打开新窗口时遇到问题。如果我注释掉If（例如getsource（）==btnAddBook），执行的操作将打开窗口。只要我在中添加if语句并尝试打开窗口，就什么也没有发生Java 使用e.getsource打开新窗口（JFrame）,java,swing,jframe,Java,Swing,Jframe,我在打开新窗口时遇到问题。如果我注释掉If（例如getsource（）==btnAddBook），执行的操作将打开窗口。只要我在中添加if语句并尝试打开窗口，就什么也没有发生 /* this is the code that adds the button and the action listner JButton btnAddBook = new JButton("Add Book"); btnAddBook.setFont(new Font("Tahom
/* this is the code that adds the button and the action listner
JButton btnAddBook = new JButton("Add Book");
btnAddBook.setFont(new Font("Tahoma", Font.BOLD, 8));
btnAddBook.setBounds(10, 327, 86, 23);
btnAddBook.addActionListener(this);
getContentPane().add(btnAddBook);
*/
public void actionPerformed(ActionEvent e) {
Object source = e.getSource();
if(source == btnAddBook){
ChildWindowAdd child = new ChildWindowAdd(this);
this.setVisible(true);
child.setVisible(true);
child.setSize(450,400);
child.setDefaultCloseOperation(DISPOSE_ON_CLOSE);
}
}
}
class ChildWindowAdd extends JFrame implements ActionListener {
LibraryDatabase parent;
Container c;
JLabel lblTitle, lblaName, lblISBN, lblDate,lbl1,lbl5,lbl10;
JTextField txtTitle, txtaName, txtISBN, txtDate;
JButton btnSave;
JSlider sRating;
JCheckBox chkSci, chkFant, chkRomance, chkAction, chkThriller, chkHorror;
public ChildWindowAdd(LibraryDatabase parent){
this.parent = parent;
getContentPane().setLayout(null);
txtTitle = new JTextField();
txtTitle.setBounds(46, 29, 146, 20);
getContentPane().add(txtTitle);
txtTitle.setColumns(10);
JLabel lblTitle = new JLabel("Book Title");
lblTitle.setFont(new Font("Tahoma", Font.PLAIN, 14));
lblTitle.setBounds(36, 11, 72, 14);
getContentPane().add(lblTitle);
JLabel lblaName = new JLabel("Author Name");
lblaName.setFont(new Font("Tahoma", Font.PLAIN, 14));
lblaName.setBounds(36, 60, 89, 14);
getContentPane().add(lblaName);
txtaName = new JTextField();
txtaName.setBounds(46, 85, 146, 20);
getContentPane().add(txtaName);
txtaName.setColumns(10);
JLabel lblIsbnNumber = new JLabel("ISBN Number");
lblIsbnNumber.setFont(new Font("Tahoma", Font.PLAIN, 14));
lblIsbnNumber.setBounds(36, 116, 86, 14);
getContentPane().add(lblIsbnNumber);
txtISBN = new JTextField();
txtISBN .setBounds(46, 143, 146, 20);
getContentPane().add(txtISBN );
txtISBN .setColumns(10);
JLabel lblDate = new JLabel("Date Added yyyy/mm/dd");
lblDate.setFont(new Font("Tahoma", Font.PLAIN, 14));
lblDate.setBounds(36, 174, 177, 20);
getContentPane().add(lblDate);
txtDate = new JTextField();
txtDate.setBounds(46, 199, 146, 20);
getContentPane().add(txtDate);
txtDate.setColumns(10);
JPanel genreP = new JPanel();
genreP.setBounds(239, 29, 158, 194);
genreP.setBorder(new TitledBorder(null, "Genre's", TitledBorder.LEADING, TitledBorder.TOP, null, null));
getContentPane().add(genreP);
genreP.setLayout(null);
final JCheckBox chkSci = new JCheckBox("Sci - Fi");
chkSci.setBounds(23, 22, 97, 23);
genreP.add(chkSci);
final JCheckBox chkFant = new JCheckBox("Fantasy");
chkFant.setBounds(23, 48, 97, 23);
genreP.add(chkFant);
final JCheckBox chkRomance = new JCheckBox("Romance");
chkRomance.setBounds(23, 74, 97, 23);
genreP.add(chkRomance);
final JCheckBox chkAction = new JCheckBox("Action");
chkAction.setBounds(23, 100, 97, 23);
genreP.add(chkAction);
final JCheckBox chkThriller = new JCheckBox("Thriller");
chkThriller.setBounds(23, 126, 97, 23);
genreP.add(chkThriller);
final JCheckBox chkHorror = new JCheckBox("Horror");
chkHorror.setBounds(23, 152, 97, 23);
genreP.add(chkHorror);
final JSlider sRating = new JSlider();
sRating.setBounds(118, 280, 200, 26);
getContentPane().add(sRating);
JLabel lbl1 = new JLabel("1");
lbl1.setBounds(118, 257, 7, 14);
getContentPane().add(lbl1);
JLabel lbl10 = new JLabel("10");
lbl10.setBounds(301, 257, 17, 14);
getContentPane().add(lbl10);
JLabel lbl5 = new JLabel("5");
lbl5.setBounds(214, 257, 7, 14);
getContentPane().add(lbl5);
JButton btnSave = new JButton("Save Book");
btnSave.addActionListener(this);
btnSave.setBounds(164, 317, 110, 23);
getContentPane().add(btnSave);
JLabel lblRating = new JLabel("Rate the book");
lblRating.setFont(new Font("Tahoma", Font.PLAIN, 12));
lblRating.setBounds(118, 226, 95, 20);
getContentPane().add(lblRating);
btnSave.addActionListener(new ActionListener() {
public void actionPerformed(ActionEvent arg0) {
PrintWriter fileWriter = null;
try {
fileWriter = new PrintWriter(new BufferedWriter(new FileWriter("c:\\temp\\database.dat", true)));
} catch (IOException e) {
e.printStackTrace();
}
fileWriter.println( txtTitle.getText()+" , "+txtaName.getText()+" , "+txtISBN.getText()+" , "+txtDate.getText()+" , "+String.valueOf(chkSci.isSelected())+" , "+String.valueOf(chkFant.isSelected())+" , "+String.valueOf(chkRomance.isSelected())+" , "+String.valueOf(chkAction.isSelected())+" , "+String.valueOf(chkThriller.isSelected())+" , "+String.valueOf(chkHorror.isSelected())+" , "+sRating.getValue());
fileWriter.close();
}
});
}
@Override
public void actionPerformed(ActionEvent arg0) {
parent.setVisible(true);
this.dispose();
}
public void actionPerformed1(ActionEvent e) {
// TODO Auto-generated method stub
}
}
根据按钮文本进行检查
((JButton)source).getText().equals("Add Book")
这是完整的代码
public void actionPerformed(ActionEvent e) {
Object source = e.getSource();
if (source instanceof JButton && ((JButton) source).getText().equals("Add Book")) {
...
}
}
这对我有用。我必须匹配字符串，因为e.getsource无法工作
public void actionPerformed(ActionEvent e) {
Object source = e.getSource();
String test = ((JButton)source).getText();
if(test == "Add Book"){
ChildWindowAdd child = new ChildWindowAdd(this);
this.setVisible(true);
child.setVisible(true);
child.setSize(450,400);
child.setDefaultCloseOperation(DISPOSE_ON_CLOSE);
}
您在哪里添加了
ActionListenerSystem.out.print（source.getClass（）.getName（））查找源对象类名。我已经发布了它。你的回答中还有一个问题。如果对除JButton
以外的其他组件使用相同的操作侦听器，则您没有检查可能会产生问题的JButton
实例。您在做什么？不要使用==
来比较字符串。请使用equals（）
来比较字符串内容。