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如果我有滾動條，JTextArea就會消失。沒有它，一切都很好。有人可以向我解釋這個嗎？以及如何解決它！添加ScrollPane讓我的JTextArea消失
此外，作爲旁白，是否可以更改顏色或設置滾動窗格上的邊框？
下面是相關代碼：
//Text Container
JPanel textCon = new JPanel();
textCon.setOpaque(false);
textCon.setLayout(new GridLayout(1,3));
add(textCon);
//Left Filler
JPanel left = new JPanel();
left.setOpaque(false);
textCon.add(left);
//Text area
mainText = new JTextArea("SAMPLE");
mainText.setOpaque(true);
mainText.setSize(50,30);
mainText.setLineWrap(true);
mainText.setWrapStyleWord(true);
textCon.add(mainText);
//Set textAre fonts, colors, border/padding
mainText.setBorder(BorderFactory.createCompoundBorder(BorderFactory.createLineBorder(Color.GREEN), BorderFactory.createEmptyBorder(10, 10, 10, 10)));
mainText.setFont(new Font("sansserif", Font.BOLD, 10));
mainText.setForeground(Color.GREEN);
mainText.setBackground(Color.BLACK);
//Scroll Bar
scroller = new JScrollPane(mainText);
scroller.setVerticalScrollBarPolicy(ScrollPaneConstants.VERTICAL_SCROLLBAR_ALWAYS);
mainText.add(scroller);
這裏是它的其餘部分，以防萬一！
import java.awt.*;
import java.awt.event.*;
import java.awt.Toolkit.*;
import javax.swing.*;
import java.io.*;
import javax.swing.border.*;
import java.util.*;
class ProjectMain extends JFrame
{
//Declare String/Array for mainText
String output = "";
String [] hero;
int page = 0;
JTextArea mainText;
JScrollPane scroller;
public ProjectMain()
{
//Set Background
setTitle("JLA Viewer");
setSize(1920,1080);
setLocationRelativeTo(null);
setDefaultCloseOperation(EXIT_ON_CLOSE);
setVisible(true);
setContentPane(new JLabel(new ImageIcon("bg.png")));
setLayout(new GridLayout(3,1));
//Refresh Background
setSize(1919,1079);
setSize(1920,1080);
//Label Container
JPanel labelCon = new JPanel();
labelCon.setOpaque(false);
labelCon.setLayout(new BorderLayout());
add(labelCon);
//Top Label
JLabel topLabel = new JLabel("JLA Profile Viewer");
topLabel.setHorizontalAlignment(SwingConstants.CENTER);
topLabel.setForeground(Color.GREEN);
topLabel.setOpaque(false);
topLabel.setFont(new Font("sansserif", Font.BOLD, 30));
labelCon.add(BorderLayout.NORTH,topLabel);
//Logo
ImageIcon logo = new ImageIcon("logo.jpg");
JLabel logoLabel = new JLabel();
logoLabel.setHorizontalAlignment(SwingConstants.CENTER);
logoLabel.setIcon(logo);
labelCon.add(BorderLayout.SOUTH,logoLabel);
//Text Container
JPanel textCon = new JPanel();
textCon.setOpaque(false);
textCon.setLayout(new GridLayout(1,3));
add(textCon);
//Left Filler
JPanel left = new JPanel();
left.setOpaque(false);
textCon.add(left);
//Text area
mainText = new JTextArea("SAMPLE");
mainText.setOpaque(true);
mainText.setSize(50,30);
mainText.setLineWrap(true);
mainText.setWrapStyleWord(true);
textCon.add(mainText);
//Set textAre fonts, colors, border/padding
mainText.setBorder(BorderFactory.createCompoundBorder(BorderFactory.createLineBorder(Color.GREEN), BorderFactory.createEmptyBorder(10, 10, 10, 10)));
mainText.setFont(new Font("sansserif", Font.BOLD, 10));
mainText.setForeground(Color.GREEN);
mainText.setBackground(Color.BLACK);
//Scroll Bar
scroller = new JScrollPane(mainText);
scroller.setVerticalScrollBarPolicy(ScrollPaneConstants.VERTICAL_SCROLLBAR_ALWAYS);
mainText.add(scroller);
//Right Filler
JPanel right = new JPanel();
right.setOpaque(false);
textCon.add(right);
//Button Container
JPanel buttonContainer = new JPanel();
buttonContainer.setOpaque(false);
add(BorderLayout.SOUTH,buttonContainer);
//PREV Button
JButton prev = new JButton("PREV");
prev.setOpaque(false);
ActionListener PrevList = new PrevButton(); //Call Button Listener
prev.addActionListener(PrevList);
buttonContainer.add(prev);
//EXIT Button
JButton exit = new JButton("EXIT");
exit.setOpaque(false);
ActionListener ExitList = new ExitButton(); //Call Button Listener
exit.addActionListener(ExitList);
buttonContainer.add(exit);
//NEXT Button
JButton next = new JButton("NEXT");
next.setOpaque(false);
ActionListener NextList = new NextButton(); //Call Button Listener
next.addActionListener(NextList);
buttonContainer.add(next);
//File Handling
try
{
File inputFile = new File ("ProjectInputFile.txt");
Scanner scanner = new Scanner(inputFile);
while(scanner.hasNextLine())
{
output = output + (scanner.nextLine() + "\n");
}
}
catch(IOException ioe)
{
}
//Add split strings to array
hero = output.split("@");
}
//Prev button event listener
public class PrevButton implements ActionListener
{
public void actionPerformed(ActionEvent e)
{
page = page - 1;
if(page < 0)
{
page = hero.length;
}
mainText.setText(hero[page]);
}
}
//Exit button event listener
public class ExitButton implements ActionListener
{
public void actionPerformed(ActionEvent e)
{
setVisible(false);
dispose();
System.exit(0);
}
}
//Next button event listener
public class NextButton implements ActionListener
{
public void actionPerformed(ActionEvent e)
{
page++;
if(page > (hero.length))
{
page = 0;
}
mainText.setText(hero[page]);
}
}
public static void main(String args[])
{
new ProjectMain();
}
}
謝謝，但這並沒有真正的幫助。不添加滾動窗格，我沒有滾動窗格。添加滾動窗格使JTextArea消失。我擴展了JFrame，因爲它適用於大學的一個項目，講師因爲某種原因需要它。 – Aezur
將'JScrollPane'添加到'textCon'' JPanel'而不是'JTextArea。請參閱更新 – Reimeus
再次感謝您花時間提供幫助，但如果將滾動窗格添加到textCon，則佈局會變得混亂。我認爲這是因爲它在一個網格上，並且所有三個插槽都被佔用，所以我擺脫了其中一個填充面板，並在其中添加了滾動窗格，但是接下來我只是得到一個大的灰色塊來佔據網格，我是否將不透明設置爲false或不是滾動窗格。這只是一個大學項目，我有一個解決方法（少文本=不需要滾動; D）所以它不是那麼重要，它只是令人討厭，我不能讓它工作。 – Aezur