import java.awt.BorderLayout;
import java.awt.Dimension;
import java.awt.GridLayout;
import java.awt.Panel;
import java.awt.event.ActionEvent;
import java.awt.event.ActionListener;
import java.awt.event.WindowAdapter;
import java.awt.event.WindowEvent;
import java.awt.event.WindowListener;
import java.text.SimpleDateFormat;

import javax.swing.JButton;
import javax.swing.JFrame;
import javax.swing.JLabel;
import javax.swing.JOptionPane;
import javax.swing.JPanel;
import javax.swing.JScrollPane;
import javax.swing.JTextArea;

public class Z09 extends JFrame{

	public static JPanel createpanels() {
		JTextArea ta1 = new JTextArea(30,30);
		JPanel panel1 = new JPanel(new BorderLayout());
		panel1.add(new JScrollPane(ta1, JScrollPane.VERTICAL_SCROLLBAR_ALWAYS, JScrollPane.HORIZONTAL_SCROLLBAR_AS_NEEDED),
				BorderLayout.CENTER);
		JButton susp = new JButton("SUSP");
		panel1.add(susp,BorderLayout.SOUTH);

		MyThread th = new MyThread(ta1);
		th.start();

		susp.addActionListener(new ActionListener() {

			@Override
			public void actionPerformed(ActionEvent e) {
				if(susp.getText() == "GO") {
					th.resumeThread();
				    susp.setText("SUSP");
				} else if (susp.getText() == "SUSP") {
					th.suspendThread();
					susp.setText("GO");
				}
			}
		});

		return panel1;
	}

	public static void main(String[] args) {

		JFrame f = new JFrame("StopResume");
		f.setLayout(new GridLayout(1,2));
		f.add(createpanels());
		f.add(createpanels());

		f.addWindowListener(new WindowAdapter() {
			public void windowClosing(WindowEvent e) {
				int a = JOptionPane.showConfirmDialog(f, "Are you sure you wanna exit?",
						"Approval", JOptionPane.OK_CANCEL_OPTION);
				if(a == JOptionPane.OK_OPTION)
					System.exit(0);
			}
		});

		f.pack();
		f.setDefaultCloseOperation(JFrame.DO_NOTHING_ON_CLOSE);
		f.setVisible(true);
		f.setLocationRelativeTo(null);
	}

}

import java.text.DateFormat;
import java.text.SimpleDateFormat;
import java.util.Calendar;
import java.util.Date;

import javax.swing.JTextArea;

public class MyThread extends Thread {
	JTextArea ta;
	boolean suspended = false;

	public MyThread(JTextArea ta) {
		this.ta = ta;
		suspended = false;
	}

	public void run() {
		while(isAlive()) {
			synchronized (this) {
				 while(suspended) {
	    	  try {
					wait();
				} catch (InterruptedException e1) {
					// TODO Auto-generated catch block
					e1.printStackTrace();
				}
	      }
	      while(!suspended) {
	    	  Calendar cal = Calendar.getInstance();
				ta.append(cal.getTime().toString() + "\n");
				try {
					Thread.sleep((long) (Math.random() * 1500 + 500));
				} catch (InterruptedException e) {
					// TODO Auto-generated catch block
					e.printStackTrace();
				}
	      }
			}

		}
	 }

	public void suspendThread() {
		suspended = true;
	}

	public void resumeThread() {
		suspended = false;
		synchronized(this) {
			notify();
		}
	}


}