小编Han*_*mer的帖子

我试图将JScrollPane添加到我的JTextArea,它不起作用.有人能告诉我有什么问题吗？我想只有横向的

import java.awt.*;
import java.awt.event.*;
import java.io.*;

import javax.swing.*;

public class Program extends JFrame{

    JButton button1, button2;
    JTextArea textArea1;
    JScrollPane scroller;
    public static String directory, nameOfFile, finalPath;

    public static void main(String[] args){

        new Program();

    }

    public Program(){

        this.setSize(500,500);
        this.setLocationRelativeTo(null);
        this.setDefaultCloseOperation(JFrame.EXIT_ON_CLOSE);
        this.setResizable(false);
        this.setTitle("swinging");

        JPanel thePanel = new JPanel();
        thePanel.setLayout(null);
        thePanel.setLayout(new FlowLayout(FlowLayout.LEFT));

        button1 = new JButton("Wybierz plik:");
        button2 = new JButton("Dodaj");

        final JTextField text = new JTextField(24);
        textArea1 = new JTextArea();
        textArea1.setEditable(true);                                        
        textArea1.setLineWrap(true);
        textArea1.setPreferredSize(new Dimension(490,200));

        scroller = new JScrollPane(textArea1);
         scroller.setHorizontalScrollBarPolicy(JScrollPane.HORIZONTAL_SCROLLBAR_ALWAYS);

        thePanel.add(button1);
        thePanel.add(text); …