try if equals jTextField5 getText String Name jTextField1 getText doub

     try {
            if (!"".equals(jTextField5.getText())){
                String Name = jTextField1.getText();
                double Price = Double.parseDouble(jTextField2.getText());
                int n = Integer.parseInt(jTextField5.getText());
                AppleList.set(n,new Apple(Name, Price));
            }
        } catch (Exception g) {
            jLabel3.setText(g.toString());
        }