对JScrollPane的使用

import javax.swing.*;

public class TestSwing extends JFrame {

public TestSwing() {
// 若没有这行代码也没有窗口事件监听，单击关闭按钮窗口将隐藏，不会关闭
this.setDefaultCloseOperation(JFrame.EXIT_ON_CLOSE);
JScrollPane sp = new JScrollPane();
JTextArea ta = new JTextArea(100, 50);
sp.getViewport().add(ta);
this.getContentPane().add(sp);

}

public static void main(String[] args) {
// TODO Auto-generated method stub
System.out.println("Starting TestMyButton...");
TestSwing mainFrame = new TestSwing();
mainFrame.setSize(400, 400);
mainFrame.setTitle("TestButton");
mainFrame.setVisible(true);
}

}