JTextArea Demo

package swing.jtextarea;

import java.util.concurrent.TimeUnit;

public class Data {

    // 假设数据为一个自增数，不断输出数据

    public void outData() {
        try {
            for (int i = 0; i < 10000; i++) {
                System.out.println("当前数据为：" + i);
                Frame.jtextarea.append("当前数据为：" + i + "\n"); // 调用主窗口的jtextarea进行添加数据，显示
                // TimeUnit.SECONDS.sleep(1);
            }
        } catch (Exception ex) {
            ex.printStackTrace();
        }

    }
}

package swing.jtextarea;

import java.awt.BorderLayout;

import javax.swing.JFrame;
import javax.swing.JScrollPane;
import javax.swing.JTextArea;
import javax.swing.SwingUtilities;

public class Frame extends JFrame {
    private static final long serialVersionUID = 8390788205754221692L;
    public static JTextArea jtextarea;

    public Frame() {
        jtextarea = new JTextArea();
        JScrollPane scrollPane = new JScrollPane(jtextarea);
        this.add(scrollPane, BorderLayout.CENTER);
        // showData();// 假设创建主窗体时，就要获取，并显示数据
    }

    public void showData() {
        SwingUtilities.invokeLater(new Runnable() {// 启动数据获取，更新显示进程
                    public void run() {
                        Data d = new Data();
                        d.outData();
                    }
                });
    }

    public static void main(String[] args) {
        SwingUtilities.invokeLater(new Runnable() {
            @Override
            public void run() {
                Frame frame = new Frame();
                frame.showData();
                frame.setSize(400, 300);
                frame.setDefaultCloseOperation(JFrame.EXIT_ON_CLOSE);
                frame.setVisible(true);
                frame.setLocationRelativeTo(null);
            }
        });

    }

}