import javax.swing.JFrame;

import javax.swing.JButton;

import java.awt.GridLayout;

import java.awt.event.MouseAdapter;

import java.awt.event.MouseEvent;

import static java.lang.System.out;

import java.util.logging.Level;

import java.util.logging.Logger;

public class MainFrame extends JFrame {

    private JButton blockButton, unblockButton;

    private final BlockTest blockTest = new BlockTest();

    private static final Logger LOGGER = Logger.getLogger(MainFrame.class.getName());

    private MainFrame() {

        initComponents();

        initFrame();

    }

    private void initComponents() {

        blockButton = new JButton("阻塞测试");

        unblockButton = new JButton("解除阻塞");

        unblockButton.setEnabled(false);

        blockButton.addMouseListener(new MouseAdapter() {

            @Override

            public void mouseClicked(MouseEvent ev) {

                if (blockButton.isEnabled()) {

                    //开启一个线程来完成阻塞测试，以避免阻塞应用界面而造成无法响应鼠标键盘的输入

                    new Thread() {

                        @Override

                        public void run() {

                            try {

                                blockButton.setEnabled(false);

                                unblockButton.setEnabled(true);

                                blockTest.block();  //处于阻塞状态，以下finally块中的代码在阻塞被解除后才会执行

                            } catch (InterruptedException ex) {

                                LOGGER.log(Level.SEVERE, null, ex);

                            } finally {

                                out.println("mouseClicked(MouseEvent) called");

                            }

                        }

                    }.start();

                }

            }

        });

        unblockButton.addMouseListener(new MouseAdapter() {

            @Override

            public void mouseClicked(MouseEvent ev) {

                if (unblockButton.isEnabled()) {

                    blockTest.unblock();

                    unblockButton.setEnabled(false);

                    blockButton.setEnabled(true);

                }

            }

        });

        setLayout(new GridLayout(2, 1));

        add(blockButton);

        add(unblockButton);

    }

    private void initFrame() {

        setTitle("block test");

        setSize(300, 200);

        setLocationRelativeTo(null);

        setDefaultCloseOperation(EXIT_ON_CLOSE);

    }

    public static void main(String[] args) {

        MainFrame frame = new MainFrame();

        frame.setVisible(true);

    }

}

import static java.lang.System.out;

public class BlockTest {

    public void block() throws InterruptedException {

        synchronized (this) {

            out.println("阻塞测试");

            wait();

            out.println("阻塞状态已解除");

        }

    }

    public void unblock() {

        synchronized (this) {

            notify();

            out.println("解除阻塞");

        }

    }

}