java - 如何获取从 JComboBox 中选择的项目的索引？

Question

这就是我创建 JComboBox 的方式 -

String[] options = {"First", "Second" , "Third"};
JComboBox optionsCombo = new JComboBox(options);

When one of these items is selected, how do i get the index of the item which was selected ? 我不想要被选中的项目。

Answer 1

int index = optionsCombo.getSelectedIndex() 

将给出选定的索引。在组合框动作监听器中使用它

Answer 2

索引从 0,1,2,.. 开始

optionsCombo.getSelectedIndex()

Answer 3

采用 ：optionsCombo.getSelectedIndex();

在actionListener里面像这样：

 ActionListener actionListener = new ActionListener() {
      public void actionPerformed(ActionEvent actionEvent) {
        System.out.println("Selected: " + optionsCombo.getSelectedItem());
        System.out.println(", Position: " + optionsCombo.getSelectedIndex());
      }
    };
    optionsCombo.addActionListener(actionListener);