并发和并行

package com.wyh.demo;
/**
 * @program: JUC
 * @description: 测试
 * @author: 魏一鹤
 * @createDate: 2022-02-10 21:24
 **/
public class demo01 {
public static void main(String[] args){
//查看cpu有多少核(处理器)
//cpu密执行 io密执行
        System.out.println(Runtime.getRuntime().availableProcessors());
    }
}

public enum State {
/**
     * Thread state for a thread which has not yet started.
     */
 //新建
    NEW,
/**
     * Thread state for a runnable thread.  A thread in the runnable
     * state is executing in the Java virtual machine but it may
     * be waiting for other resources from the operating system
     * such as processor.
     */
 //运行
    RUNNABLE,
/**
     * Thread state for a thread blocked waiting for a monitor lock.
     * A thread in the blocked state is waiting for a monitor lock
     * to enter a synchronized block/method or
     * reenter a synchronized block/method after calling
     * {@link Object#wait() Object.wait}.
     */
 //阻塞
    BLOCKED,
/**
     * Thread state for a waiting thread.
     * A thread is in the waiting state due to calling one of the
     * following methods:
     * <ul>
     *   <li>{@link Object#wait() Object.wait} with no timeout</li>
     *   <li>{@link #join() Thread.join} with no timeout</li>
     *   <li>{@link LockSupport#park() LockSupport.park}</li>
     * </ul>
     *
     * <p>A thread in the waiting state is waiting for another thread to
     * perform a particular action.
     *
     * For example, a thread that has called <tt>Object.wait()</tt>
     * on an object is waiting for another thread to call
     * <tt>Object.notify()</tt> or <tt>Object.notifyAll()</tt> on
     * that object. A thread that has called <tt>Thread.join()</tt>
     * is waiting for a specified thread to terminate.
     */
//等待(死死的等)
    WAITING,
/**
     * Thread state for a waiting thread with a specified waiting time.
     * A thread is in the timed waiting state due to calling one of
     * the following methods with a specified positive waiting time:
     * <ul>
     *   <li>{@link #sleep Thread.sleep}</li>
     *   <li>{@link Object#wait(long) Object.wait} with timeout</li>
     *   <li>{@link #join(long) Thread.join} with timeout</li>
     *   <li>{@link LockSupport#parkNanos LockSupport.parkNanos}</li>
     *   <li>{@link LockSupport#parkUntil LockSupport.parkUntil}</li>
     * </ul>
     */
 //超时等待(过期不候)
    TIMED_WAITING,
/**
     * Thread state for a terminated thread.
     * The thread has completed execution.
     */
 //终止
    TERMINATED;
}

package com.wyh.demo;
import java.util.concurrent.TimeUnit;
/**
 * @program: JUC
 * @description: 测试
 * @author: 魏一鹤
 * @createDate: 2022-02-10 21:24
 **/
public class demo01 {
public static void main(String[] args) throws InterruptedException {
        //TimeUnit也是JUC下的
//睡一天
        TimeUnit.DAYS.sleep(1);
//睡两秒
        TimeUnit.SECONDS.sleep(2);
    }
}