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import javax.swing.*;

class First{
    public static void main(String args[]){

        Second gui = new Second();
        gui.setDefaultCloseOperation(WindowConstants.EXIT_ON_CLOSE);
        gui.setSize(300, 200);
        gui.setVisible(true);

    }
}

import javax.swing.*;
import java.awt.*;
import java.awt.event.ActionEvent;
import java.awt.event.ActionListener;

class Second extends JFrame {

    private JList leftList, rightList;
    private JButton moveButton;
    private static String[] foods = {"ham", "bacon", "beef", "salad", "potatoes"};

    public Second(){
        super("Title");
        setLayout(new FlowLayout());

        leftList = new JList(foods);
        leftList.setVisibleRowCount(4);
        leftList.setSelectionMode(ListSelectionModel.MULTIPLE_INTERVAL_SELECTION);
        add(new JScrollPane(leftList));

        moveButton = new JButton("Move -->");
        moveButton.addActionListener(
                new ActionListener() {
                    @Override
                    public void actionPerformed(ActionEvent e) {
                        rightList.setListData(leftList.getSelectedValues());
                    }
                }
        );
        add(moveButton);

        rightList = new JList();
        rightList.setVisibleRowCount(4);
        rightList.setFixedCellHeight(15);
        rightList.setFixedCellWidth(100);
        rightList.setSelectionMode(ListSelectionModel.MULTIPLE_INTERVAL_SELECTION);
        add(new JScrollPane(rightList));

    }
}