java - 在 JComboBOX 中选择项目时无法将文本设置为 JLabel

Question

此代码向我显示语法错误(“{”除外)，但我认为还有其他问题。

 public class CircleController extends JPanel {
   private JComboBox product1=new JComboBox(Application.listArray);
   private JLabel jlb1=new JLabel();
   //..........some fields more
   // constructor....
 public CircleController() {

  // Panel to group labels
JPanel panel1 = new JPanel();
//..........some labels....
//another panel
JPanel panel2 = new JPanel();
panel2.setLayout(new GridLayout(4,4,20,20 ));
panel2.add(product1);
panel2.add(jlb1);

部分代码有错误

  //product1 is combobox, jlbt is label wich I want to set when I selected item from  combobox

    product1.addItemListener(new ItemListener() {
    public void itemStateChanged(ItemEvent e)  { // in this line shows me an error

        (Product name:Application.manu) {
             if ((String)product1.getSelectedItem()==name.getName()){
                 String price1=Double.toString(name.getPrice());
                jlb1.setText(price1);
             }
        }

    if (model != null){
        model.setProduct((String)product1.getSelectedItem());}}

});

程序使用这段代码运行良好

    product1.addItemListener(new ItemListener() {
    public void itemStateChanged(ItemEvent e) { 

    if (model != null){
        model.setProduct((String)product1.getSelectedItem());}}

});

但是当我添加这个语句的时候(这个语句是勾选的，是好的)

   (Product name:Application.manu) {
             if ((String)product1.getSelectedItem()==name.getName()){
                 String price1=Double.toString(name.getPrice());
                jlb1.setText(price1);
             }
        }

在 product1.addItemListener(new ItemListener() {.... 程序中显示错误

我是否必须添加另一个 ItemListener 来设置标签？

Answer 1

编译错误其实和这一行有关:

(Product name:Application.manu) {

它看起来像一个foreach，所以它应该是:

for (Product name:Application.manu) {