create combobox using jframe

import java.awt.event.ItemEvent;

import java.awt.event.ItemListener;

import javax.swing.JComboBox;

import javax.swing.JFrame;

import javax.swing.JTextField;

public class CreateCombobox extends JFrame implements ItemListener{

     

      JTextField output1;

      JComboBox combobox1;

     

     

      public CreateTextbox(){

           

            setLayout(null);

           

              String[] str = {"item1","item2","item3","item4"};

                  combobox1 = new JComboBox(str);

                  combobox1.setBounds(100,50,100,20);

                  combobox1.addItemListener(this);

                  add(combobox1);

                     

              output1 = new JTextField(5);

              output1.setBounds(100,200,100,20);

              add(output1);

             

      }

     

      public void itemStateChanged(ItemEvent e) {

            output1.setText(combobox1.getSelectedItem().toString());

           

      }

     

     

      public static void main (String[] args)

    {

            CreateTextbox me = new CreateTextbox();

         me.setDefaultCloseOperation(JFrame.EXIT_ON_CLOSE);

         me.setVisible(true);

         me.setLocation(550, 500);

         me.setSize(300, 300);

         me. setTitle("Create Textbox");

    }

     

}

output: