User interface responsiveness : Swing Thread « Threads « Java

User interface responsiveness


// :
// User interface responsiveness.
// From 'Thinking in Java, 3rd ed.' (c) Bruce Eckel 2002
// See copyright notice in CopyRight.txt.

class UnresponsiveUI {
  private volatile double d = 1;

  public UnresponsiveUI() throws Exception {
    while (d > 0)
      d = d + (Math.PI + Math.E) / d;; // Never gets here

public class ResponsiveUI extends Thread {

  private static volatile double d = 1;

  public ResponsiveUI() {

  public void run() {
    while (true) {
      d = d + (Math.PI + Math.E) / d;

  public static void main(String[] args) throws Exception {
    //! new UnresponsiveUI(); // Must kill this process
    new ResponsiveUI();
    Thread.sleep(300);; // 'monitor' provides input
    System.out.println(d); // Shows progress
} ///:~


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