import javax.swing.*;
import java.awt.Dimension;
import java.awt.BorderLayout;

public class JScrollPaneTest6 extends JFrame{

  public static void main(String[] args){
    JScrollPaneTest6 frame = new JScrollPaneTest6();

    frame.setDefaultCloseOperation(JFrame.EXIT_ON_CLOSE);
    frame.setBounds(10, 10, 300, 200);
    frame.setTitle("タイトル");
    frame.setVisible(true);
  }

  JScrollPaneTest6(){
    JScrollPane scrollpane = new JScrollPane();
    scrollpane.setPreferredSize(new Dimension(200, 120));

    JViewport view = new JViewport();

    JTextArea textarea = new JTextArea("JTextAreaを配置");
    view.setView(textarea);

    scrollpane.setViewport(view);

    JPanel panel = new JPanel();
    panel.add(scrollpane);

    getContentPane().add(panel, BorderLayout.CENTER);
  }