Simple wait and notify example

wait and notify example with GUI components

import java.awt.event.ActionEvent; import java.awt.event.ActionListener; import javax.swing.JButton; import javax.swing.JFrame; import javax.swing.JLabel; import javax.swing.JScrollPane; import javax.swing.JTextArea; class Resource { int nums[] = new int[10]; int count = 0; int i; String text = ""; synchronized void waitThread(JTextArea ta, int num) { for (i = 1; i <= nums.length; i++) { nums[count++] = num * i; try { text = text + num + " * " + " = " + nums[count - 1] + "\n"; ta.setText(text); wait(); } catch (InterruptedException e) { e.printStackTrace(); } } } public synchronized int getCount() { return count; } synchronized void notifyThread() { notify(); } } public class D1 { JLabel l1; Resource resource = new Resource(); public D1() { JFrame f = new JFrame(); f.setSize(500, 500); f.setLayout(null); f.setDefaultCloseOperation(JFrame.EXIT_ON_CLOSE); JButton b1 = new JButton("start"); JButton b3 = new JButton("notify"); JTextArea ta = new JTextArea(); JScrollPane jp=new JScrollPane(ta); jp.setBounds(100, 150, 300, 200); b1.setBounds(20, 30, 100, 30); b3.setBounds(20, 110, 100, 30); f.add(jp); f.add(b1); f.add(b3); b1.addActionListener(new ActionListener() { @Override public void actionPerformed(ActionEvent e) { try { Thread t1 = new Thread() { @Override public void run() { resource.waitThread(ta, 12); } }; t1.start(); b1.setEnabled(false); b3.setEnabled(true); }catch (Exception e1) { // TODO: handle exception } } }); b3.addActionListener(new ActionListener() { @Override public void actionPerformed(ActionEvent e) { try { if(resource.getCount()!=10) { System.out.println(resource.getCount()); Thread t1 = new Thread() { @Override public void run() { resource.notifyThread(); } }; t1.start(); }else { resource.count=0; ta.setText(""); resource.text=""; b3.setEnabled(false); b1.setEnabled(true); } }catch (Exception e1) { // TODO: handle exception } } }); f.setVisible(true); } public static void main(String[] args) { D1 d = new D1(); } }