1.JAVA如何获取jvm中的线程线程所有线程?
2.JAVA 线ç¨
3.java多线程关于消费者和生产者,求源程序,源码源码求大神解答。线程线程愿意提高报酬
4.Java多线程——singleThreadExecutor
JAVA如何获取jvm中的源码源码网上源码网所有线程?
在Java中,你可以通过Java的线程线程java.lang.management包获取JVM中的所有线程。这个包提供了一些用于管理和监视Java虚拟机的源码源码工具。具体来说,线程线程你可以使用ThreadMXBean接口来获取线程信息。源码源码
以下是线程线程一段示例代码,演示如何获取和打印JVM中的源码源码所有线程:
java复制代码
import java.lang.management.ManagementFactory;
import java.lang.management.ThreadInfo;
import java.lang.management.ThreadMXBean;
public class Main {
public static void main(String[] args) {
// 获取ThreadMXBean
ThreadMXBean threadMXBean = ManagementFactory.getThreadMXBean();
// 不需要获取同步的monitor和synchronizer信息,仅获取线程和线程堆栈信息
ThreadInfo[] threadInfos = threadMXBean.dumpAllThreads(false,线程线程竞价爆量预警源码 false);
// 遍历线程信息,仅打印线程ID和线程名称信息
for (ThreadInfo threadInfo : threadInfos) {
System.out.println("[" + threadInfo.getThreadId() + "] " + threadInfo.getThreadName());
}
}
}
这段代码首先通过ManagementFactory.getThreadMXBean()获取ThreadMXBean实例,源码源码然后调用dumpAllThreads()方法获取所有线程的线程线程ThreadInfo,最后遍历并打印所有线程的源码源码ID和名称。
需要注意的线程线程是,dumpAllThreads()方法会返回一个ThreadInfo数组,大河马盲盒源码每个ThreadInfo代表一个线程,包含了关于该线程的大量信息,包括线程ID、线程名称、线程状态、中英外贸网站源码线程堆栈信息等。在上面的示例代码中,我们只打印了线程ID和线程名称,但你可以根据需要打印其他信息。
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synchronized(lock1){ // lock1 æ¯å ¬ç¨åæ¥é
// 代ç 段 A
// 访é®å ±äº«èµæº resource1
// éè¦åæ¥
}
}
⦠f2() {
synchronized(lock1){ // lock1 æ¯å ¬ç¨åæ¥é
// 代ç 段 B
// 访é®å ±äº«èµæº resource1
// éè¦åæ¥
}
}
⦠f3() {
synchronized(lock1){ // lock1 æ¯å ¬ç¨åæ¥é
// 代ç 段 C
// 访é®å ±äº«èµæº resource2
// éè¦åæ¥
}
}
⦠f4() {
synchronized(lock1){ // lock1 æ¯å ¬ç¨åæ¥é
// 代ç 段 D
// 访é®å ±äº«èµæº resource2
// éè¦åæ¥
}
}
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public static final Object lock2 = new Object();
⦠f3() {
synchronized(lock2){ // lock2 æ¯å ¬ç¨åæ¥é
// 代ç 段 C
// 访é®å ±äº«èµæº resource2
// éè¦åæ¥
}
}
⦠f4() {
synchronized(lock2){ // lock2 æ¯å ¬ç¨åæ¥é
// 代ç 段 D
// 访é®å ±äº«èµæº resource2
// éè¦åæ¥
}
}
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java多线程关于消费者和生产者,求源程序,求大神解答。愿意提高报酬
自己看代码体会吧import java.util.concurrent.BlockingQueue;import java.util.concurrent.ExecutorService;
import java.util.concurrent.Executors;
import java.util.concurrent.LinkedBlockingQueue;
public class BlockingQueueTest {
public static void main(String[] args) {
ExecutorService service = Executors.newCachedThreadPool();
BlockingQueue<String> blockingQueue = new LinkedBlockingQueue<String>();
System.out.println("blockingQueue now contains " + blockingQueue.size() + " unit");
service.submit(new Consumer1(blockingQueue));
gap(blockingQueue);
service.submit(new Productor2(blockingQueue));
gap(blockingQueue);
service.submit(new Productor3(blockingQueue));
gap(blockingQueue);
service.submit(new Productor4(blockingQueue));
gap(blockingQueue);
service.submit(new Productor5(blockingQueue));
gap(blockingQueue);
service.shutdown();
}
private static void gap(BlockingQueue<String> blockingQueue) {
try {
Thread.sleep();
} catch (InterruptedException e) {
// TODO Auto-generated catch block
e.printStackTrace();
}
System.out.println("blockingQueue now contains " + blockingQueue.size() + " unit");
}
}
class Consumer1 implements Runnable{
BlockingQueue<String> blockingQueue;
public Consumer1(BlockingQueue<String> blockingQueue) {
super();
this.blockingQueue = blockingQueue;
}
@Override
public void run() {
// TODO Auto-generated method stub
System.out.println("Consumer1 start: need units");
for(int i = 0; i < ; i++){
try {
blockingQueue.take();
} catch (InterruptedException e) {
// TODO Auto-generated catch block
e.printStackTrace();
}
}
System.out.println("Consumer1 end: has got units");
}
}
class Productor2 implements Runnable{
BlockingQueue<String> blockingQueue;
public Productor2(BlockingQueue<String> blockingQueue) {
super();
this.blockingQueue = blockingQueue;
}
@Override
public void run() {
// TODO Auto-generated method stub
System.out.println("Productor2 start: put 5 units");
for(int i = 0; i < 5; i++){
try {
blockingQueue.put("Object");
} catch (InterruptedException e) {
// TODO Auto-generated catch block
e.printStackTrace();
}
}
System.out.println("Productor2 end: has put 5 units");
}
}
class Productor3 implements Runnable{
BlockingQueue<String> blockingQueue;
public Productor3(BlockingQueue<String> blockingQueue) {
super();
this.blockingQueue = blockingQueue;
}
@Override
public void run() {
// TODO Auto-generated method stub
System.out.println("Productor3 start: put 5 units");
for(int i = 0; i < 5; i++){
try {
blockingQueue.put("Object");
} catch (InterruptedException e) {
// TODO Auto-generated catch block
e.printStackTrace();
}
}
System.out.println("Productor3 end: has put 5 units");
}
}
class Productor4 implements Runnable{
BlockingQueue<String> blockingQueue;
public Productor4(BlockingQueue<String> blockingQueue) {
super();
this.blockingQueue = blockingQueue;
}
@Override
public void run() {
// TODO Auto-generated method stub
System.out.println("Productor4 start: put units");
for(int i = 0; i < ; i++){
try {
blockingQueue.put("Object");
} catch (InterruptedException e) {
// TODO Auto-generated catch block
e.printStackTrace();
}
}
System.out.println("Productor4 end: has put units");
}
}
class Productor5 implements Runnable{
BlockingQueue<String> blockingQueue;
public Productor5(BlockingQueue<String> blockingQueue) {
super();
this.blockingQueue = blockingQueue;
}
@Override
public void run() {
// TODO Auto-generated method stub
System.out.println("Productor5 start: put units");
for(int i = 0; i < ; i++){
try {
blockingQueue.put("Object");
} catch (InterruptedException e) {
// TODO Auto-generated catch block
e.printStackTrace();
}
}
System.out.println("Productor5 end: has put units");
}
}
每个线程是隔了1s启动的, 结果
blockingQueue now contains 0 unit
Consumer1 start: need units
blockingQueue now contains 0 unit
Productor2 start: put 5 units
Productor2 end: has put 5 units
blockingQueue now contains 0 unit
Productor3 start: put 5 units
Productor3 end: has put 5 units
Consumer1 end: has got units
blockingQueue now contains 0 unit
Productor4 start: put units
Productor4 end: has put units
blockingQueue now contains unit
Productor5 start: put units
blockingQueue now contains unit
Java多线程——singleThreadExecutor
singleThreadExecutor,Java中Executors类的一个静态方法,创建了一个线程池,该线程池仅包含一个核心线程。这意味着所有任务将由这一单一线程执行,形成单线程执行模式。若核心线程因异常停止,则将启动新的线程替代,确保服务不中断。此线程池特别设计确保任务执行顺序与提交顺序一致,提升程序执行流程的可预测性与稳定性。
创建singleThreadExecutor的代码示例如下:
在这个例子中,ThreadPoolExecutor的corePoolSize和maximumPoolSize的值均为1,明确指出线程池仅包含一个核心线程,且最大线程数同样为1,保证了线程的高效利用。缓冲队列采用的是LinkedBlockingQueue,这是一个无边界队列,用于存储等待执行的任务。