Chapter 13: Problem 5

How do you retrieve the selected item from a JComboBox component? How do you get the index of the selected item?

Short Answer

Expert verified

Answer: To retrieve the selected item and its index from a JComboBox in Java, follow these steps: 1. Create a JComboBox and add items to it using `addItem()` method. 2. Implement an ActionListener and add it to the JComboBox using `addActionListener()` method. 3. Inside the `actionPerformed()` method, call `getSelectedItem()` on the JComboBox object to retrieve the selected item. 4. Call `getSelectedIndex()` on the JComboBox object to get the index of the selected item. This way, you can retrieve both the selected item and its index when the user selects an item.

Step by step solution

Create a JComboBox

First, you will need to import the necessary Java packages and create a JComboBox component. To do this, add the following lines of code: ``` import javax.swing.*; import java.awt.event.*; JComboBox comboBox = new JComboBox(); ```

Add Items to JComboBox

Next, you will need to add items to the JComboBox component. You can add items by calling the addItem() method on the JComboBox object like this: ``` comboBox.addItem("Item 1"); comboBox.addItem("Item 2"); comboBox.addItem("Item 3"); ```

Add ActionListener

To detect when the user selects an item in the JComboBox, you will need to implement an ActionListener and add it to the JComboBox. Here's how you can do that: ``` comboBox.addActionListener(new ActionListener() { @Override public void actionPerformed(ActionEvent e) { // Code to execute when an item is selected } }); ```

Get the Selected Item

Inside the actionPerformed() method, call the getSelectedItem() method on the JComboBox object to retrieve the selected item. Here's the code to do this: ``` String selectedItem = (String) comboBox.getSelectedItem(); System.out.println("Selected item: " + selectedItem); ```

Get the Index of the Selected Item

To get the index of the selected item in the JComboBox, call the getSelectedIndex() method on the JComboBox object. Here's the code to do this: ``` int selectedIndex = comboBox.getSelectedIndex(); System.out.println("Index of the selected item: " + selectedIndex); ``` By following these steps, you will be able to create a JComboBox, add items to it, and retrieve both the selected item and its index when the user selects an item.

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How do you retrieve the selected item from a JComboBox component? How do you get the index of the selected item?

Short Answer

Step by step solution

Create a JComboBox

Add Items to JComboBox

Add ActionListener

Get the Selected Item

Get the Index of the Selected Item

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