通过关键事件搜索 jList

Question

I have a problem with my Java code. I am trying to search trough a JList , with key events, but it seems like it can't find anything.

With this event, I am adding values to my JList :

DefaultListModel<String> model = new DefaultListModel<>();
private void productButtonActionPerformed(java.awt.event.ActionEvent evt) {                                                   
    for (Shop i : shopSettings.Products) {
        model.addElement(i.getProductName()+i.getPrice()+i.getProductCategory()+i.getNumber());
    }
    jList1.setModel(model);
}  

Here I am trying to search trough the JList , with this action, but anytime I write something, it just overwrites the list, and displays nothing.

private void jTextField1KeyReleased(java.awt.event.KeyEvent evt) {                                        
    DefaultListModel filteredProducts = new DefaultListModel();
    for (Shop i: shopSettings.Products) {
        String productName=i.getProductName()+i.getPrice()+i.getProductCategory()+i.getNumber().toLowerCase();
        if(productName.contains(jTextField1.getText().toLowerCase()));
        {
            model.addElement(i.getProductName()+i.getPrice()+i.getProductCategory()+i.getNumber());
        }
    }
    model=filteredProduct;
    jList1.setModel(model);
}

Sorry, if the answer is way too obvious, I have just getting started with Java.

Answer 1

could be:

 String productName= (i.getProductName()+i.getPrice()+i.getProductCategory()+i.getNumber()).toLowerCase();

Best to learn how the debugger works in your IDE of choice and step through the algorithm to see why it doesn't match.

Edit: To be more clear: Call toLowerCase on the result of the concatenation, not just the last part.