62_ComboBox

//JComboBox = A component that combines a button or editable field and a drop-down list

<Main.java>
public class Main{
    public static void main(String[] args){

    new myFrame();

    }
}


<myFrame.java>
import javax.swing.*;
import java.awt.*;
import java.awt.event.ActionEvent;
import java.awt.event.ActionListener;

public class myFrame extends JFrame implements ActionListener {
    JComboBox comboBox; //global scope if outside constructor, local scope if inside: {}
    myFrame(){
        this.setDefaultCloseOperation(JFrame.EXIT_ON_CLOSE);
        this.setLayout(new FlowLayout());

        String[] animals = {"dog", "cat", "bird"}; //Create string array, Use Wrapper class

        comboBox = new JComboBox();
        comboBox.addActionListener(this);

        comboBox.setEditable(true); //can type to search for
        System.out.println(comboBox.getItemCount());
        comboBox.addItem("horse");//add item to end of the list
        comboBox.insertItemAt("pig",0);//item, index (to add at)
        comboBox.setSelectedIndex(0);//default selected item
        comboBox.removeItem("cat");//name
        comboBox.removeItemAt(0);//index
        comboBox.removeAllItems();//Clear comboBox


        this.add(comboBox);
        this.pack();
        this.setVisible(true);
    }

    @Override
    public void actionPerformed(ActionEvent e) { //response to certain event
        if(e.getSource()==comboBox){
            //System.out.println(comboBox.getSelectedItem()); //name of item
            System.out.println(comboBox.getSelectedIndex()); //0,1,2...
        }
    }
}