java-可编辑的JComboBox

如果用户选择索引为1的项目,然后将其从“ 123”更改为“ abcd”.如何设置“ abcd”而不是“ 123”(在NetBeans中)？另外,如何永久删除该项目？

解决方法:

请尝试以下方法.当用户更改值并按[ENTER]时,将删除旧值,并添加新值.

如果需要在同一位置替换值,则必须提供自己的模型,该模型支持在特定位置添加值.

final DefaultComboBoxModel model = new DefaultComboBoxModel(new String[] {"Red", "Green", "Blue"});

comboBox = new JComboBox(model);
comboBox.setEditable(true);
comboBox.addActionListener(new ActionListener() {
    private int selectedIndex = -1;

    @Override
    public void actionPerformed(ActionEvent e) {
        int index = comboBox.getSelectedIndex();
        if(index >= 0) {
            selectedIndex = index;
        }
        else if("comboBoxEdited".equals(e.getActionCommand())) {
            Object newValue = model.getSelectedItem();
            model.removeElementAt(selectedIndex);
            model.addElement(newValue);
            comboBox.setSelectedItem(newValue);
            selectedIndex = model.getIndexOf(newValue);
        }
    }
});
comboBox.setSelectedIndex(0);

标签：jcombobox,java
来源： https://codeday.me/bug/20191210/2101449.html