Pause execution in Java - sleep() and wait()

You may use the following two methods to pause the execution of the current thread when needs to wait for a required condition.

1. Thread.sleep(<milliseconds>)

       Public class PauseDemo {
             private String[] collectInput() {
                   InputFrame input = new InputFrame();
                   input.run();
                 
                   while (!input.submitted && input.isVisible()) {
                         try {
                                //Make the current thread sleep for one second
                                Thread.sleep(1000);
                         } catch (InterruptedException e) {
                                e.printStackTrace();
                        }
                   }

                   String[] result = new String[3];
                   result[0] = input.getName();
                   result[1] = input.getAddress();
                   result[2] = input.getPhone();

                   return result;
             }

            private class InputFrame extends JFrame implements Runnable {
                  boolean submitted = false;

                  JTextField nameField = null;
                  JTextField addressField = null;
                  JTextField phoneField = null;

                  public InputFrame() {
                         JLabel nameLabel = new JLabel("Name: ");
                         JLabel addressLabel = new JLabel("Address: ");
                         JLabel phoneLabel = new JLabel("Phone: ");

                         nameField = new JTextField(9);
                         addressField = new TextField(30);
                         phoneField = new JTextField(10);

                         JButton submit = new JButton("Submit");
                         submit.addMouseListener(new MouseAdapter() {
                               public void mouseClicked(MouseEvent e) {
                                      submitted = true;
                                      InputFrame.this.setVisible(false);
                               }
                         });

                         setLayout(new GridLayout(3, 2);
                         add(nameLabel);
                         add(nameField);
                         add(addressLabel);
                         add(addressField);
                         add(phoneLabel);
                         add(phoneField);
                  }

                  public String getName() {return nameField.getText(); }
                  public String getAddress() {return addressField.getText(); }
                  public String getPhone() {return phoneField.getText(); }

                  public void run() {
                         pack();
                         setSize(800, 600);
                         setLocation(400, 300);
                         setVisible(true);
                  }
           }

       }

2. class wait(<milliseconds>)

In the above case, replacing Thread.sleep(1000) with PauseDemo.class.wait(1000) will also work.

3. TimeUnit

//sleep one second
TimeUnit.SECONDS.sleep(1);

//sleep two minute
TimeUnit.MINUTES.sleep(2);

The good thing about this approach is that it is very easy to know the time it is going to sleep without having to convert from milliseconds.

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