按键分配在Java组合框 [英] assign keys for combo box in java

问题描述

我要在Swing是简单的添加的JComboBox 但我想要分配的值康宝每个项目。我有以下的code

I want to add a JComboBox in Swing that is simple but I want to assign the values for each items in combo. I have the following code

    JComboBox jc1= new JComboBox();
    jc1.addItem("a");
    jc1.addItem("b");
    jc1.addItem("c");

现在我想的是，当点击组合框它应该返回1，2和3相应
 代替，B，C。
有什么办法来分配在组合框中每个项目的核心价值观？

Now what I want is that when click on combo box it should return 1, 2 and 3 correspondingly instead of a ,b, c. Is there any way to assign the key values for each items in combo box?

推荐答案

您可以添加一个项目作为一个对象，而不是添加字符串是这样的：

You can add an item as an object instead of adding String like this:

JComboBox<ItemClass> jc = new JComboBox<ItemClass>();
    jc.addItem(item1);
    jc.addItem(item2);
    jc.addItem(item3);

所以要返回键，事件的功能是： jc.getSelectedItem（）getKey
这样做的方式已经覆盖的toString（）类itemClass时的函数返回要在组合框中显示的字符串。

So to return key, the function of the event is : jc.getSelectedItem().getKey Doing this way you have to override the toString() function of class ItemClass to return the string you want to show in combobox.

顺便说一句，退货数量，你可以尝试： jc.getSelectedIndex（），它会回报你的字符串索引（ 0 1 2 为AbC）

Btw, for return number, you may try : jc.getSelectedIndex(), it'll return your index of your string (0 1 2 for "a" "b" "c")

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