Java 12入れた

JavaFXが標準SDKにはいってないとかどーとかなので気にせずSwing使っていきます

import java.util.List;
import java.util.ArrayList;
import java.util.stream.Stream;

import javax.sound.sampled.Mixer;
import javax.sound.sampled.AudioSystem;

import javax.swing.JFrame;
import javax.swing.JList;
import javax.swing.SwingUtilities;
import javax.swing.border.LineBorder;

import java.awt.Color;
import java.awt.Dimension;

public class AudioSample extends JList<Mixer.Info>{
    public static void main(String... args){
        SwingUtilities.invokeLater(() ->{
            var frame = new JFrame();
            var sample = new AudioSample(AudioSample.getLineInput().toArray(new Mixer.Info[0]));
            sample.setPreferredSize(new Dimension(400, 300));
            sample.setBorder(new LineBorder(Color.BLACK));
            
            frame.add(sample);
            
            frame.setDefaultCloseOperation(JFrame.EXIT_ON_CLOSE);
            frame.setVisible(true);
            frame.pack();
        });
    }
    
    public AudioSample(Mixer.Info[] elements){
        super(elements);
    }
    
    public static List<Mixer.Info> getLineInput(){
        return Stream.of(AudioSystem.getMixerInfo())
            .filter(info -> info.getName().startsWith("Port ライン入力"))
            .collect(ArrayList::new, List::add, List::addAll);
    }
}