Creating a JComboBox in Java Swings

package jcombobox;

import javax.swing.*;
import java.awt.*;
import java.awt.event.*;
import java.util.Vector;

public class JComboxBoxExample1 extends JFrame {
	public JComboxBoxExample1() {
		// Set up the frame
		setTitle("JComboBox Example");
		setSize(400, 300);
		setDefaultCloseOperation(JFrame.EXIT_ON_CLOSE);
		setLayout(new FlowLayout());

		// JComboBox with default data model
		JComboBox<String> comboBox1 = new JComboBox<>();
		comboBox1.addItem("India");
		comboBox1.addItem("USA");
		comboBox1.addItem("China");
		comboBox1.addItem("Germany");
		comboBox1.addItem("Canada");
		comboBox1.addItem("Japan");
		comboBox1.setEditable(true);
		
		// Adding JComboBox components to the frame
		add(new JLabel("Select Country:"));
		add(comboBox1);
		
		// Showing the frame
		setVisible(true);
	}

	public static void main(String[] args) {
		new JComboxBoxExample1();
	}
}

package jcombobox;

import javax.swing.*;
import java.awt.*;
import java.awt.event.*;
import java.util.Vector;

public class JComboxBoxExample2 extends JFrame {
	public JComboxBoxExample2() {
		// Set up the frame
		setTitle("JComboBox Example");
		setSize(700, 200);
		setLocation(200, 100);
		setDefaultCloseOperation(JFrame.EXIT_ON_CLOSE);
		setLayout(new FlowLayout());

		// JComboBox with default data model
		JComboBox<String> comboBox1 = new JComboBox<>();
		comboBox1.addItem("India");
		comboBox1.addItem("USA");
		comboBox1.addItem("China");
		comboBox1.addItem("Germany");
		comboBox1.addItem("Canada");
		comboBox1.addItem("Japan");
		comboBox1.setEditable(true);

		// Adding JComboBox components to the frame
		add(new JLabel("Select Country:"));
		add(comboBox1);

		// JComboBox with an array of items
		String[] items = {"Apple", "Orange", "Grapes", "Mango", "Guava"};
		JComboBox<String> comboBox2 = new JComboBox<>(items);

		// Adding JComboBox components to the frame
		add(new JLabel("Select Fruit:"));
		add(comboBox2);

		// JComboBox with a Vector of items
		Vector<String> vectorItems = new Vector<>();
		vectorItems.add("Java");
		vectorItems.add("Python");
		vectorItems.add("C++");
		vectorItems.add("PHP");
		JComboBox<String> comboBox3 = new JComboBox<>(vectorItems);

		// Adding JComboBox components to the frame
		add(new JLabel("Select Fruit:"));
		add(comboBox3);

		// JComboBox with a custom ComboBoxModel
		DefaultComboBoxModel<String> model = new DefaultComboBoxModel<>(
				new String[]{"Dog", "Cat", "Rabbit","Bird","Parrots","Horse"});
		JComboBox<String> comboBox4 = new JComboBox<>(model);

		// Additional JComboBox methods demonstration
		comboBox4.addItem("Reptiles");
		comboBox4.removeItem("Cat");
		comboBox4.setSelectedIndex(2);
		comboBox4.setRenderer(new DefaultListCellRenderer());

		// Adding JComboBox components to the frame
		add(new JLabel("Select Fruit:"));
		add(comboBox4);

		// Showing the frame
		setVisible(true);
	}

	public static void main(String[] args) {
		new JComboxBoxExample2();
	}
}