Jlabel does not receive new text

Question

That code was meant to be when he clicked the button the same became invisible and the lblVira becomes a number between 0 and 10, gives no error message and compiles only that the lblVira not "grab" the new text (I’m new to java).

private void btnstartActionPerformed(java.awt.event.ActionEvent evt) {                                         
    btnstart.setVisible(false);
    Random random = new Random();
        int array[] = new int[1]; 

        for (int i=1; i<array.length; i++) {
             array[i] = random.nextInt(10); 
            lblVira.setText(Integer.toString(array[i]));
        }    }

Answer 1

private void btnstartActionPerformed(java.awt.event.ActionEvent evt) {                                         
    btnstart.setVisible(false);
    Random random = new Random();
        int array[] = new int[1]; 

        for (int i=1; i<array.length; i++) {
             array[i] = random.nextInt(10); 
            lblVira.setText(Integer.toString(array[i]));
        }    }

Look at this one for. It rotates while i<1. It happens that once it starts with i=1, then the condition of for already starts fake and he won’t do anything.

I think you wanted i=0 instead of i=1.

Answer 2

I think you want something like this:

private void btnstartActionPerformed(java.awt.event.ActionEvent evt) {
    btnstart.setVisible(false);
    Random random = new Random();
    int numeroAleatorio = random.nextInt(10); 
    lblVira.setText(Integer.toString(numeroAleatorio));
}

No need to create a ArrayList