Java--Thread类常用方法介绍

迈不过友情╰ 2021-08-14 00:53 460阅读 0赞

### Thread类常用方法 ###

Thread对象调用：

<table> 
 <thead> 
  <tr> 
   <th align="left">序号</th> 
   <th align="left">方法</th> 
   <th align="left">方法描述</th> 
  </tr> 
 </thead> 
 <tbody> 
  <tr> 
   <td align="left">1</td> 
   <td align="left">pubic void start()</td> 
   <td align="left">使该线程开始执行；Java虚拟机调用该线程的run方法</td> 
  </tr> 
  <tr> 
   <td align="left">2</td> 
   <td align="left">public void run()</td> 
   <td align="left">如果该线程是使用独立的 Runnable 运行对象构造的，则调用该 Runnable 对象的 run 方法；否则，该方法不执行任何操作并返回。</td> 
  </tr> 
  <tr> 
   <td align="left">3</td> 
   <td align="left">public final void setName(String name)</td> 
   <td align="left">改变线程名称，使之与参数 name 相同。</td> 
  </tr> 
  <tr> 
   <td align="left">4</td> 
   <td align="left">public final void setPriority(int priority)</td> 
   <td align="left">更改线程的优先级</td> 
  </tr> 
  <tr> 
   <td align="left">5</td> 
   <td align="left">public final void setDaemon(boolean on)</td> 
   <td align="left">将该线程标记为守护线程或用户线程。</td> 
  </tr> 
  <tr> 
   <td align="left">6</td> 
   <td align="left">public final void join(long millisec)</td> 
   <td align="left">调用线程等待被调用线程完成后，才能继续用下运行。参数为最多等待多少毫秒</td> 
  </tr> 
  <tr> 
   <td align="left">7</td> 
   <td align="left">public void interrupt()</td> 
   <td align="left">中断线程</td> 
  </tr> 
  <tr> 
   <td align="left">8</td> 
   <td align="left">public final boolean isAlive()</td> 
   <td align="left">测试线程是否处于活动状态。</td> 
  </tr> 
 </tbody> 
</table>

Thread类调用：

<table> 
 <thead> 
  <tr> 
   <th align="left">序号</th> 
   <th align="left">方法</th> 
   <th align="left">方法描述</th> 
  </tr> 
 </thead> 
 <tbody> 
  <tr> 
   <td align="left">1</td> 
   <td align="left">public static void yield()</td> 
   <td align="left">暂停当前正在执行的线程对象，并执行其他线程。</td> 
  </tr> 
  <tr> 
   <td align="left">2</td> 
   <td align="left">public static boolean holdsLock(Object x)</td> 
   <td align="left">当且仅当当前线程在指定的对象上保持监视器锁时，才返回 true。</td> 
  </tr> 
  <tr> 
   <td align="left">3</td> 
   <td align="left">public static void sleep(long millisec)</td> 
   <td align="left">在指定的毫秒数内让当前正在执行的线程休眠（暂停执行），此操作受到系统计时器和调度程序精度和准确性的影响。</td> 
  </tr> 
  <tr> 
   <td align="left">4</td> 
   <td align="left">public staticThread currentThread()</td> 
   <td align="left">返回对当前正在执行的线程对象的引用。</td> 
  </tr> 
  <tr> 
   <td align="left">5</td> 
   <td align="left">public static void dumpStack()</td> 
   <td align="left">将当前线程的堆栈跟踪打印至标准错误流。</td> 
  </tr> 
 </tbody> 
</table>

示例：

package pers.zhang.thread;
    
    /** * @author zhang * @date 2020/1/15 - 0:36 */
    public class GuessANumber extends Thread { 
    
        private int number;
    
        public GuessANumber(int number) { 
            this.number = number;
        }
    
        public void run() { 
            int counter = 0;
            int guess = 0;
            do { 
                guess = (int) (Math.random() * 100 + 1);
                System.out.println(this.getName() + " guesses " + guess);
                counter++;
            } while(guess != number);
            System.out.println("** Correct!" + this.getName() + "in" + counter + "guesses.**");
        }
    }

package pers.zhang.thread;
    
    /** * @author zhang * @date 2020/1/15 - 0:35 */
    public class DisplayMessage implements Runnable { 
    
        private String message;
    
        public DisplayMessage(String message) { 
            this.message = message;
        }
    
        @Override
        public void run() { 
            while(true) { 
                System.out.println(message);
            }
        }
    }

package pers.zhang.thread;
    
    /** * @author zhang * @date 2020/1/15 - 0:37 */
    public class ThreadClassDemo { 
    
        public static void main(String [] args) { 
            Runnable hello = new DisplayMessage("Hello");
            Thread thread1 = new Thread(hello);
            thread1.setDaemon(true);
            thread1.setName("hello");
            System.out.println("Starting hello thread...");
            thread1.start();
    
            Runnable bye = new DisplayMessage("Goodbye");
            Thread thread2 = new Thread(bye);
            thread2.setPriority(Thread.MIN_PRIORITY);
            thread2.setDaemon(true);
            System.out.println("Starting goodbye thread...");
            thread2.start();
    
            System.out.println("Starting thread3...");
            Thread thread3 = new GuessANumber(27);
            thread3.start();
            try { 
                thread3.join();
            }catch(InterruptedException e) { 
                System.out.println("Thread interrupted.");
            }
            System.out.println("Starting thread4...");
            Thread thread4 = new GuessANumber(75);
    
            thread4.start();
            System.out.println("main() is ending...");
        }
    }

输出每次都不同：

Starting hello thread...
    Starting goodbye thread...
    Hello
    Hello
    Hello
    Hello
    Hello
    Hello
    Goodbye
    Goodbye
    Goodbye
    Goodbye
    Goodbye
    .......