我正在尝试放置一个滚动文本区域，称为 descriptionScroll。但是，滚动条不可见。我尝试了很多方法，都以挫败感告终。
我是否缺少任何东西来显示滚动条？它应该出现在“说明”旁边的大文本框的右侧
这是相关的代码：
import javax.swing.JScrollPane;
import javax.swing.JTextArea;
protected JTextArea descriptionTextArea;
protected JScrollPane descriptionScroll;
String descriptionText =
"Lot ID(s):\n" +
"Wafer ID(s):\n" +
"PSPT(Probe Ship Part Type):\n" +
"Tester:\n" +
"Tester Job Name:\n" +
"PID (FPP, FPC):\n" +
"Reprobe required before shipping lot? (Y/N)\n\n" +
"Hold for (individual):\n" +
"Hold for (group)\n" +
"Expected release date\n" +
"Hold Comments:\n\n" +
"Shipping Information:\n" +
"Special Instructions:\n";
public Constructor(){
descriptionTextArea = new JTextArea(descriptionText);
descriptionScroll = new JScrollPane(descriptionTextArea, JScrollPane.VERTICAL_SCROLLBAR_ALWAYS, JScrollPane.HORIZONTAL_SCROLLBAR_AS_NEEDED);
add(descriptionTextArea);
add(descriptionScroll);
pack();
setSize(790, 625);
setDefaultCloseOperation(EXIT_ON_CLOSE);
setLocationRelativeTo(null);
setVisible(true);
descriptionTextArea.setSize(650, 200);
descriptionTextArea.setLocation(110, 228);
descriptionTextArea.setLineWrap(true);
}
