EarlyNotify.java
资源名称:Source.rar [点击查看]
上传用户:songled
上传日期:2022-07-14
资源大小:94k
文件大小:2k
源码类别:
进程与线程
开发平台:
Java
- import java.util.*;
- public class EarlyNotify extends Object {
- private List list;
- public EarlyNotify() {
- list = Collections.synchronizedList(new LinkedList());
- }
- public String removeItem() throws InterruptedException {
- print("in removeItem() - entering");
- synchronized ( list ) {
- if ( list.isEmpty() ) { // dangerous to use 'if'!
- print("in removeItem() - about to wait()");
- list.wait();
- print("in removeItem() - done with wait()");
- }
- // extract the new first item
- String item = (String) list.remove(0);
- print("in removeItem() - leaving");
- return item;
- }
- }
- public void addItem(String item) {
- print("in addItem() - entering");
- synchronized ( list ) {
- // There'll always be room to add to this List
- // because it expands as needed.
- list.add(item);
- print("in addItem() - just added: '" + item + "'");
- // After adding, notify any and all waiting
- // threads that the list has changed.
- list.notifyAll();
- print("in addItem() - just notified");
- }
- print("in addItem() - leaving");
- }
- private static void print(String msg) {
- String name = Thread.currentThread().getName();
- System.out.println(name + ": " + msg);
- }
- public static void main(String[] args) {
- final EarlyNotify en = new EarlyNotify();
- Runnable runA = new Runnable() {
- public void run() {
- try {
- String item = en.removeItem();
- print("in run() - returned: '" +
- item + "'");
- } catch ( InterruptedException ix ) {
- print("interrupted!");
- } catch ( Exception x ) {
- print("threw an Exception!!!n" + x);
- }
- }
- };
- Runnable runB = new Runnable() {
- public void run() {
- en.addItem("Hello!");
- }
- };
- try {
- Thread threadA1 = new Thread(runA, "threadA1");
- threadA1.start();
- Thread.sleep(500);
- // start a *second* thread trying to remove
- Thread threadA2 = new Thread(runA, "threadA2");
- threadA2.start();
- Thread.sleep(500);
- Thread threadB = new Thread(runB, "threadB");
- threadB.start();
- Thread.sleep(10000); // wait 10 seconds
- threadA1.interrupt();
- threadA2.interrupt();
- } catch ( InterruptedException x ) {
- // ignore
- }
- }
- }