Java Program to Create a Choice Menu to Select an Item

This is a Java program to create a choice menu to select an item and display it in the frame.

Problem Description

We have to write a program in Java such that it creates a choice menu consisting of 5 languages (C, C++, Java, Python, R), and the selected language from the choice menu is displayed in the frame.

Expected Input and Output

For displaying the language selected from a Choice Menu, we can have the following 5 sets of input and output.

1. Language selected ‘C’:

If the language C is selected from the Choice Menu (C, C++, Java, Python, R),
then the expected output is "Language Selected : C"

2. Language selected ‘C++’:

If the language C++ is selected from the Choice Menu (C, C++, Java, Python, R),
then the expected output is "Language Selected : C++"

3. Language selected ‘Java’:

If the language Java is selected from the Choice Menu (C, C++, Java, Python, R),
then the expected output is "Language Selected : Java"

4. Language selected ‘Python’:

If the language Python is selected from the Choice Menu (C, C++, Java, Python, R),
then the expected output is "Language Selected : Python"

5. Language selected ‘R’:

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If the language R is selected from the Choice Menu (C, C++, Java, Python, R),
then the expected output is "Language Selected : R"

Problem Solution

1. Create a frame, a choice menu consisting of the 5 languages, and an output text field.
2. Add the choice menu to the frame.
3. Associate ItemListener with the choice menu, and display the item selected.

Program/Source Code

Here is source code of the Java Program to create a choice menu and display the item selected. The program is successfully compiled and tested using javac compiler on Fedora 30.

/*Java Program to create a choice menu and display the item selected*/

```
import javax.swing.*;
```
```
import java.awt.*;
```
```
import java.awt.event.*;
```

class Choice_Menu implements ItemListener

```
{
```
```
	static Choice menu;
```
```
	static JTextField text;
```
```
        //Driver function
```
```
	public static void main(String args[])
```
```
	{
```
```
		//Create a frame
```

		JFrame frame=new JFrame("Choice Menu");

```
		frame.setSize(500,500);
```

		frame.setDefaultCloseOperation(JFrame.EXIT_ON_CLOSE);

```
		frame.setLayout(null);
```

		frame.getContentPane().setBackground(Color.white);

```
		//Create a choice menu
```
```
		menu=new Choice();
```
```
		menu.setBounds(100,100,120,60);
```
```
		frame.add(menu);
```
```
		//Add items to the menu
```
```
		menu.add("C");
```
```
		menu.add("C++");
```
```
		menu.add("Java");
```
```
		menu.add("Python");
```
```
		menu.add("R");
```
```
		//Create a text field for output
```
```
		text=new JTextField();
```
```
		text.setBounds(0,400,500,100);
```
```
		frame.add(text);
```
```
		//Create an object
```
```
		Choice_Menu obj=new Choice_Menu();
```

		//Associate ItemListener with the choice menu

```
		menu.addItemListener(obj);
```
```
		//Display the frame
```
```
		frame.setVisible(true);
```
```
	}
```

        //function to display the item selected

	public void itemStateChanged(ItemEvent e)

```
	{
```
```
		String item=menu.getSelectedItem();
```

		text.setText("Language Selected : "+item);

```
	}
```
```
}
```

Program Explanation

1. Create a frame with background color & specific size. frame.setBackground(Color.white); is used to create the frame background color as white. frame.setSize(500,500); is used to set the width and height of the frame.
2. frame.setDefaultCloseOperation(JFrame.EXIT_ON_CLOSE); is a default close operation for the frame.
3. Create a choice menu with a setBounds() values and add it to the frame by using frame.add();.
menu=new Choice(); –> Used to create the choice menu.
menu.setBounds(100,100,120,60); –> Sets the position of menu.
frame.add(menu); –> It will add the menu to the frame.

4. Once the menu is created. Add the items to the menu by using menu.add(” “);. The menu items used in this program are:
menu.add(“C”); –> Item “C” added to the menu.
menu.add(“C++”); –> Item “C++” added to the menu.
menu.add(“Java”); –> Item “Java” added to the menu.
menu.add(“Python”); –> Item “Python” added to the menu.
menu.add(“R”); –> Item “R” added to the menu.

5. Create a text field with a setBounds() values and add it to the frame. This text field is used for output to display a selected item from the menu.
6. Choice_Menu obj=new Choice_Menu(); is used to create the object. Once object is created associate ItemListener with the choice menu.
7. frame.setVisible(true); is used to display the frame.
8. String item=menu.getSelectedItem();. Function getItemSelected returns the selected item in String format.
9. text.setText(“Language Selected : “+item); –> It displays the selected menu item from choice menu in the output textfield.

Runtime Test Cases

Here’s the run time test case for getting the item selected from a choice menu.

Test case 1 – Here’s the runtime output to test language ‘C’. For example, if the language C is selected from the Choice Menu (C, C++, Java, Python, R), then the program displays “Language Selected : C”.

Test case 2 – Here’s the runtime output to test language ‘C++’. For example, if the language C++ is selected from the Choice Menu (C, C++, Java, Python, R), then the program displays “Language Selected : C++”.

Test case 3 – Here’s the runtime output to test language ‘Java’. For example, if the language Java is selected from the Choice Menu (C, C++, Java, Python, R), then the program displays “Language Selected : Java”.

Test case 4 – Here’s the runtime output to test language ‘Python’. For example, if the language Python is selected from the Choice Menu (C, C++, Java, Python, R), then the program displays “Language Selected : Python”.

Test case 5 – Here’s the runtime output to test language ‘R’. For example, if the language R is selected from the Choice Menu (C, C++, Java, Python, R), then the program displays “Language Selected : R”.

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