我的JFrame有问题。 当我单击“返回”按钮时，会出现“Classroomdetails”菜单，但是教室输入JFrame表单（addclassroom）保留在后台而不是关闭 请帮我纠正一下。
这是我的代码::
public class addclassroom extends JFrame{
public JTextField txt_classno,txt_bname,txt_size,txt_resources;
public JComboBox cmbfloor;
public JLabel label1, label2, label3, label4, label5, label6;
public JButton Save;
public JButton Reset;
public JButton Back;
public addclassroom(){
label1 = new javax.swing.JLabel();
label1.setFont(new java.awt.Font("Verdana", 3, 14)); // NOI18N
label1.setForeground(Color.BLACK);
label1.setText("Classroom Records Input");
label2 = new javax.swing.JLabel("Classroom_No:");
txt_classno = new javax.swing.JTextField(8);
label3 = new javax.swing.JLabel("Building Name:");
txt_bname = new javax.swing.JTextField(15);
label4 = new javax.swing.JLabel("Building Floor:");
String floor[] = {"Ground floor","1st floor","2nd floor","3rd floor","4th floor", "5th floor", "6th floor", "7th floor", "8th floor"};
cmbfloor = new javax.swing.JComboBox(floor);
label5 = new javax.swing.JLabel("Size Capacity:");
txt_size = new javax.swing.JTextField(5);
label6 = new javax.swing.JLabel("Resources");
txt_resources = new javax.swing.JTextField(20);
Save = new javax.swing.JButton();
Save.setText("Save");
Reset = new javax.swing.JButton();
Reset.setText("Reset");
Back = new javax.swing.JButton();
Back.setText("Back");
label1.setBounds(100, 25, 200, 50);
label2.setBounds(50, 100, 100, 50);
txt_classno.setBounds(180, 100, 100, 30);
label3.setBounds(50, 150, 100, 50);
txt_bname.setBounds(180, 150, 140, 30);
label4.setBounds(50, 200, 100, 50);
cmbfloor.setBounds(180, 200, 115, 30);
label5.setBounds(50, 250, 100, 50);
txt_size.setBounds(180, 250, 65, 30);
label6.setBounds(50, 300, 100, 50);
txt_resources.setBounds(180, 300, 175, 30);
Save.setBounds(100, 400, 75, 20);
Reset.setBounds(200, 400, 75, 20);
Back.setBounds(300,400,75,20);
JFrame ciFrame = new JFrame("Classroom Records Input Form");
ciFrame.add(label1);
ciFrame.add(label2);
ciFrame.add(txt_classno);
ciFrame.add(label3);
ciFrame.add(txt_bname);
ciFrame.add(label4);
ciFrame.add(cmbfloor);
ciFrame.add(label5);
ciFrame.add(txt_size);
ciFrame.add(label6);
ciFrame.add(txt_resources);
ciFrame.add(Save);
ciFrame.add(Reset);
ciFrame.add(Back);
ciFrame.setLayout(null);
ciFrame.setVisible(true);
ciFrame.setSize(500, 500);
ciFrame.setResizable(false);
ciFrame.setDefaultCloseOperation(JFrame.EXIT_ON_CLOSE);
Save.setMnemonic('S');
Save.addActionListener(new ActionListener() {
public void actionPerformed(ActionEvent e)
{
Save.setEnabled(true);
}
});
Reset.setMnemonic('R');
Back.setMnemonic('B');
Handleraddclassroom h = new Handleraddclassroom();
Save.addActionListener(h);
Reset.addActionListener(h);
Back.addActionListener(h);
}
public class Handleraddclassroom implements ActionListener{
public void actionPerformed(ActionEvent event){
String name = ((JButton)event.getSource()).getText();
if (name.equals("Back")){
dispose();
Classroomdetails cm = new Classroomdetails();
}
if (name.equals("Reset")){
txt_classno.setText("");
txt_bname.setText("");
txt_size.setText("");
txt_resources.setText("");
}
if (name.equals("Save")){
String filename = "C:/JAVA/schedule.accdb";
String database = "jdbc:odbc:scheduling";
//Character & Presence checks
String nsize = txt_size.getText();
String rsc = txt_resources.getText();
Pattern p = Pattern.compile("[A-Z,a-z,&%$@!()*^]");
Matcher Cnsize = p.matcher(nsize);
Pattern q = Pattern.compile("[A-Z,a-z,&%$@!()*^]");
Matcher Rsc = q.matcher(rsc);
if(txt_classno.getText().equals("")){
JOptionPane.showMessageDialog(addclassroom.this,"Classroom No field should not be blank");
}
if(txt_bname.getText().equals("")){
JOptionPane.showMessageDialog(addclassroom.this,"Building Name field should not be blank");
}
if(txt_size.getText().equals("")){
JOptionPane.showMessageDialog(addclassroom.this,"Size Capacity field should not be blank");
}else if(Cnsize.find()){
JOptionPane.showMessageDialog(addclassroom.this,"Invalid value for Size capacity entered. Please check again");
}
if(txt_resources.getText().equals("")){
JOptionPane.showMessageDialog(addclassroom.this,"Resources field should not be blank");
}else if(!Rsc.find()){
JOptionPane.showMessageDialog(addclassroom.this,"Invalid value for Resources entered. Please check again");
}
else{
try {
Class.forName("sun.jdbc.odbc.JdbcOdbcDriver");
Connection con = DriverManager.getConnection(database ,"",""); //username &password not being used
String flr="";
if(cmbfloor.getSelectedIndex()==0){
flr="Ground floor"; }
else if(cmbfloor.getSelectedIndex()==1){
flr="1st floor";}
else if(cmbfloor.getSelectedIndex()==2){
flr="2nd floor";}
else if(cmbfloor.getSelectedIndex()==3){
flr="3rd floor";}
else if(cmbfloor.getSelectedIndex()==4){
flr="4th floor";}
else if(cmbfloor.getSelectedIndex()==5){
flr="5th floor";}
else if(cmbfloor.getSelectedIndex()==6){
flr="6th floor";}
else if(cmbfloor.getSelectedIndex()==7){
flr="7th floor";}
else if(cmbfloor.getSelectedIndex()==8){
flr="8th floor";}
Statement s = con.createStatement(ResultSet.TYPE_SCROLL_INSENSITIVE, ResultSet.CONCUR_READ_ONLY); //The Result set can now scroll forward and back
String sql = "INSERT INTO classroom VALUES('"
+ txt_classno.getText()+ "','"
+ txt_bname.getText() + "','"
+ flr + "','"
+ txt_size.getText() + "','"
+ txt_resources.getText()+ "' )";
JOptionPane.showMessageDialog(addclassroom.this,"Classroom Records Saved.");
dispose();
addclassroom ac = new addclassroom();
s.execute(sql);
s.close();
con.close();
} catch (Exception e) {System.out.print("Error: " + e);}
}
}
}
}
}
答案 0 :(得分：2)
您的代码令人困惑，因为您的主要类扩展了JFrame，但您还创建了一个名为JFrame的内部ciFrame，这是实际显示的内容。{/ p>
快速解决方法是移动ciFrame旁边的JButton Back声明（不要将其设为public并将其称为back，而不是Back 1}}）。然后，而不是dispose()做ciFrame.dispose();
长期来说，请更改您的代码，例如扩展JFrame并仅使用this的{{1}}实例或创建一个作为变量，并且不要扩展{{1 }}
我不喜欢发布100行代码，但是在这里，你的代码被修改为可以工作：
JFrame答案 1 :(得分：2)
public class addclassroom
{
public JTextField txt_classno,txt_bname,txt_size,txt_resources;
public JComboBox cmbfloor;
public JLabel label1, label2, label3, label4, label5, label6;
public JButton Save;
public JButton Reset;
public JButton Back;
public addclassroom(){
label1 = new javax.swing.JLabel();
label1.setFont(new java.awt.Font("Verdana", 3, 14)); // NOI18N
label1.setForeground(Color.BLACK);
label1.setText("Classroom Records Input");
label2 = new javax.swing.JLabel("Classroom_No:");
txt_classno = new javax.swing.JTextField(8);
label3 = new javax.swing.JLabel("Building Name:");
txt_bname = new javax.swing.JTextField(15);
label4 = new javax.swing.JLabel("Building Floor:");
String floor[] = {"Ground floor","1st floor","2nd floor","3rd floor","4th floor", "5th floor", "6th floor", "7th floor", "8th floor"};
cmbfloor = new javax.swing.JComboBox(floor);
label5 = new javax.swing.JLabel("Size Capacity:");
txt_size = new javax.swing.JTextField(5);
label6 = new javax.swing.JLabel("Resources");
txt_resources = new javax.swing.JTextField(20);
Save = new javax.swing.JButton();
Save.setText("Save");
Reset = new javax.swing.JButton();
Reset.setText("Reset");
Back = new javax.swing.JButton();
Back.setText("Back");
label1.setBounds(100, 25, 200, 50);
label2.setBounds(50, 100, 100, 50);
txt_classno.setBounds(180, 100, 100, 30);
label3.setBounds(50, 150, 100, 50);
txt_bname.setBounds(180, 150, 140, 30);
label4.setBounds(50, 200, 100, 50);
cmbfloor.setBounds(180, 200, 115, 30);
label5.setBounds(50, 250, 100, 50);
txt_size.setBounds(180, 250, 65, 30);
label6.setBounds(50, 300, 100, 50);
txt_resources.setBounds(180, 300, 175, 30);
Save.setBounds(100, 400, 75, 20);
Reset.setBounds(200, 400, 75, 20);
Back.setBounds(300,400,75,20);
JFrame ciFrame = new JFrame("Classroom Records Input Form");
ciFrame.add(label1);
ciFrame.add(label2);
ciFrame.add(txt_classno);
ciFrame.add(label3);
ciFrame.add(txt_bname);
ciFrame.add(label4);
ciFrame.add(cmbfloor);
ciFrame.add(label5);
ciFrame.add(txt_size);
ciFrame.add(label6);
ciFrame.add(txt_resources);
ciFrame.add(Save);
ciFrame.add(Reset);
ciFrame.add(Back);
ciFrame.setLayout(null);
ciFrame.setVisible(true);
ciFrame.setSize(500, 500);
ciFrame.setResizable(false);
ciFrame.setDefaultCloseOperation(JFrame.DISPOSE_ON_CLOSE);
Save.setMnemonic('S');
Save.addActionListener(new ActionListener() {
public void actionPerformed(ActionEvent e)
{
Save.setEnabled(true);
}
});
Reset.setMnemonic('R');
Back.setMnemonic('B');
Handleraddclassroom h = new Handleraddclassroom();
Save.addActionListener(h);
Reset.addActionListener(h);
Back.addActionListener(h);
}
public class Handleraddclassroom implements ActionListener{
public void actionPerformed(ActionEvent event){
String name = ((JButton)event.getSource()).getText();
if (name.equals("Back")){
Classroomdetails cm = new Classroomdetails();
dispose();
}
if (name.equals("Reset")){
txt_classno.setText("");
txt_bname.setText("");
txt_size.setText("");
txt_resources.setText("");
}
if (name.equals("Save")){
String filename = "C:/JAVA/schedule.accdb";
String database = "jdbc:odbc:scheduling";
//Character & Presence checks
String nsize = txt_size.getText();
String rsc = txt_resources.getText();
Pattern p = Pattern.compile("[A-Z,a-z,&%$@!()*^]");
Matcher Cnsize = p.matcher(nsize);
Pattern q = Pattern.compile("[A-Z,a-z,&%$@!()*^]");
Matcher Rsc = q.matcher(rsc);
if(txt_classno.getText().equals("")){
JOptionPane.showMessageDialog(null,"Classroom No field should not be blank");
}
if(txt_bname.getText().equals("")){
JOptionPane.showMessageDialog(null,"Building Name field should not be blank");
}
if(txt_size.getText().equals("")){
JOptionPane.showMessageDialog(null,"Size Capacity field should not be blank");
}else if(Cnsize.find()){
JOptionPane.showMessageDialog(null,"Invalid value for Size capacity entered. Please check again");
}
if(txt_resources.getText().equals("")){
JOptionPane.showMessageDialog(null,"Resources field should not be blank");
}else if(!Rsc.find()){
JOptionPane.showMessageDialog(null,"Invalid value for Resources entered. Please check again");
}
else{
try {
Class.forName("sun.jdbc.odbc.JdbcOdbcDriver");
Connection con = DriverManager.getConnection(database ,"",""); //username &password not being used
String flr="";
if(cmbfloor.getSelectedIndex()==0){
flr="Ground floor"; }
else if(cmbfloor.getSelectedIndex()==1){
flr="1st floor";}
else if(cmbfloor.getSelectedIndex()==2){
flr="2nd floor";}
else if(cmbfloor.getSelectedIndex()==3){
flr="3rd floor";}
else if(cmbfloor.getSelectedIndex()==4){
flr="4th floor";}
else if(cmbfloor.getSelectedIndex()==5){
flr="5th floor";}
else if(cmbfloor.getSelectedIndex()==6){
flr="6th floor";}
else if(cmbfloor.getSelectedIndex()==7){
flr="7th floor";}
else if(cmbfloor.getSelectedIndex()==8){
flr="8th floor";}
Statement s = con.createStatement(ResultSet.TYPE_SCROLL_INSENSITIVE, ResultSet.CONCUR_READ_ONLY); //The Result set can now scroll forward and back
String sql = "INSERT INTO classroom VALUES('"
+ txt_classno.getText()+ "','"
+ txt_bname.getText() + "','"
+ flr + "','"
+ txt_size.getText() + "','"
+ txt_resources.getText()+ "' )";
JOptionPane.showMessageDialog(null,"Classroom Records Saved.");
s.execute(sql);
s.close();
con.close();
} catch (Exception e) {System.out.print("Error: " + e);}
}
}
}
}
private void dispose() {
}
}