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paola
Asked: 2020-04-16 21:12:38 +0800 CST 2020-04-16 21:12:38 +0800 CST

Sending text from one JFrame to another

  • 772

I would like to know why this code does not send me data from one Jframe to another. I have two fields (textField), one (num1) in a Jframe called purchases and the other (p4) in another Jframe called invoice.

What I want is that I type any word in the shopping field called num1 and it appears in the other field (p4) of the other JFrame.

For that I execute the following code, in a button called invoice, as shown below. But it does not send the word.

What could be the problem?

private void BotonFacturaActionPerformed(java.awt.event.ActionEvent evt){             
    String dato; //variable que gusrda la informacion que se dijite el JTextField llamado num1
    dato=num1.getText();//estoy capturando lo que se digite en el campo num1 y guardandolo en la variable dato
    new Factura().setVisible(true);//la ventana que recibe los datos se abra
    Factura.p4.setText(dato);//envia el dato a la variable de la factura
}
java

2 Answers

  1. Best Answer

    When I need to send information between windows, I usually modify the constructor of the JFrame by adding the parameter of the variable that I want to send.

    Example. In my main window, event on button click:

    private void btnSendTextActionPerformed(java.awt.event.ActionEvent evt) {                                            
    String nombre = txtNombre.getText(); //Obtengo el texto que contiene el textfield txtNombre

    JFrame childFrame = new ChildFrame(nombre); //Creo una instancia de mi otra ventana "childFrame"
    childFrame.setLocationRelativeTo(null); //Que cuando aparezca la ventana sea en el centro de la pantalla principal
    childFrame.setResizable(false); //Que no se pueda cambiar el tamaño
    childFrame.setVisible(true); //Que sea visible
}

    Now, you can notice that when creating the childFrame instance, I am sending the variable "name" as a parameter to the constructor method. The other side looks like this.

    In the other window, in the constructor method:

    public ChildFrame(String arg) {
    initComponents(); //Metodo que inicializa los componentes generados por netbeans
    lblSaludo.setText("Hola: "+arg); //Establezco a mi lblSaludo el texto
}

    There are other ways to do this, you can also create your own "init" function and after instantiating the child window, you call its init method and pass it whatever variables are required.

    enter image description here

    • 1

  2. in the Jframe purchase you have your text field and your button

    private javax.swing.JButton btnEnviar;
private javax.swing.JTextField num1;

    inside the actionPerformed

    int info = Integer.parseInt(num1.getText());
    Factura.dato = info;
    Factura f = new Factura();
    f.setVisible(true);

    the invoice Jframe has a static variable used to set that value in this form

    public static int dato;

    in your constructor you do this

    public Factura() {
    initComponents();

    //se modifica el valor del campo de texto p4
    //al momento de crear una nueva instancia de Factura esto sucedara cuando se precione el boton en tu ventana compra se modifica dicha variable y luego se setea en este campos de texto
    p4.setText(Integer.toString(dato));

}
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