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1.3currentThread()方法

该方法可返回代码段正在被哪个线程调用的信息

 1 package com.cky.test;
 2 
 3 /**
 4  * Created by chenkaiyang on 2017/12/2.
 5  */
 6 public class Test {
 7     public static void main(String[] args){
 8 
 9         System.out.println(Thread.currentThread().getName());
10     }
11 }

D:itjdk1.8injava -Didea.launcher.port=7532 "-Didea.launcher.bin.path=D:itideaIntelliJ IDEA 2016.3.3in" -Dfile.encoding=UTF-8 -classpath "D:itjdk1.8jrelibcharsets.jar;D:itjdk1.8jrelibdeploy.jar;D:itjdk1.8jrelibextaccess-bridge-64.jar;D:itjdk1.8jrelibextcldrdata.jar;D:itjdk1.8jrelibextdnsns.jar;D:itjdk1.8jrelibextjaccess.jar;D:itjdk1.8jrelibextjfxrt.jar;D:itjdk1.8jrelibextlocaledata.jar;D:itjdk1.8jrelibext
ashorn.jar;D:itjdk1.8jrelibextsunec.jar;D:itjdk1.8jrelibextsunjce_provider.jar;D:itjdk1.8jrelibextsunmscapi.jar;D:itjdk1.8jrelibextsunpkcs11.jar;D:itjdk1.8jrelibextzipfs.jar;D:itjdk1.8jrelibjavaws.jar;D:itjdk1.8jrelibjce.jar;D:itjdk1.8jrelibjfr.jar;D:itjdk1.8jrelibjfxswt.jar;D:itjdk1.8jrelibjsse.jar;D:itjdk1.8jrelibmanagement-agent.jar;D:itjdk1.8jrelibplugin.jar;D:itjdk1.8jrelib
esources.jar;D:itjdk1.8jrelib
t.jar;F:springboot	hreaddemooutproduction	hreaddemo;D:itideaIntelliJ IDEA 2016.3.3libidea_rt.jar" com.intellij.rt.execution.application.AppMain com.cky.test.Test
main

Process finished with exit code 0

结果分析：main方法被名为main的线程调用

测试下面

 1 package com.cky.thread;
 2 
 3 /**
 4  * Created by chenkaiyang on 2017/12/2.
 5  */
 6 public class MyFirstThread  extends Thread{
 7 
 8     public MyFirstThread () {
 9         System.out.println("构造方法的打印："+ Thread.currentThread().getName());
10     }
11     @Override
12     public void run() {
13         super.run();
14         System.out.println("run方法的打印" +Thread.currentThread().getName());
15     }
16 }

View Code

D:itjdk1.8injava -Didea.launcher.port=7533 "-Didea.launcher.bin.path=D:itideaIntelliJ IDEA 2016.3.3in" -Dfile.encoding=UTF-8 -classpath "D:itjdk1.8jrelibcharsets.jar;D:itjdk1.8jrelibdeploy.jar;D:itjdk1.8jrelibextaccess-bridge-64.jar;D:itjdk1.8jrelibextcldrdata.jar;D:itjdk1.8jrelibextdnsns.jar;D:itjdk1.8jrelibextjaccess.jar;D:itjdk1.8jrelibextjfxrt.jar;D:itjdk1.8jrelibextlocaledata.jar;D:itjdk1.8jrelibext ashorn.jar;D:itjdk1.8jrelibextsunec.jar;D:itjdk1.8jrelibextsunjce_provider.jar;D:itjdk1.8jrelibextsunmscapi.jar;D:itjdk1.8jrelibextsunpkcs11.jar;D:itjdk1.8jrelibextzipfs.jar;D:itjdk1.8jrelibjavaws.jar;D:itjdk1.8jrelibjce.jar;D:itjdk1.8jrelibjfr.jar;D:itjdk1.8jrelibjfxswt.jar;D:itjdk1.8jrelibjsse.jar;D:itjdk1.8jrelibmanagement-agent.jar;D:itjdk1.8jrelibplugin.jar;D:itjdk1.8jrelib esources.jar;D:itjdk1.8jrelib t.jar;F:springboot hreaddemooutproduction hreaddemo;D:itideaIntelliJ IDEA 2016.3.3libidea_rt.jar" com.intellij.rt.execution.application.AppMain com.cky.test.Test
构造方法的打印：main
run方法的打印Thread-0

Process finished with exit code 0

 1 package com.cky.test;
 2 
 3 import com.cky.thread.MyFirstThread;
 4 
 5 /**
 6  * Created by chenkaiyang on 2017/12/2.
 7  */
 8 public class Test {
 9     public static void main(String[] args){
10         MyFirstThread myFirstThread = new MyFirstThread();
11         //myFirstThread.start();
12         myFirstThread.run();
13     }
14 }

View Code

D:itjdk1.8injava -Didea.launcher.port=7534 "-Didea.launcher.bin.path=D:itideaIntelliJ IDEA 2016.3.3in" -Dfile.encoding=UTF-8 -classpath "D:itjdk1.8jrelibcharsets.jar;D:itjdk1.8jrelibdeploy.jar;D:itjdk1.8jrelibextaccess-bridge-64.jar;D:itjdk1.8jrelibextcldrdata.jar;D:itjdk1.8jrelibextdnsns.jar;D:itjdk1.8jrelibextjaccess.jar;D:itjdk1.8jrelibextjfxrt.jar;D:itjdk1.8jrelibextlocaledata.jar;D:itjdk1.8jrelibext ashorn.jar;D:itjdk1.8jrelibextsunec.jar;D:itjdk1.8jrelibextsunjce_provider.jar;D:itjdk1.8jrelibextsunmscapi.jar;D:itjdk1.8jrelibextsunpkcs11.jar;D:itjdk1.8jrelibextzipfs.jar;D:itjdk1.8jrelibjavaws.jar;D:itjdk1.8jrelibjce.jar;D:itjdk1.8jrelibjfr.jar;D:itjdk1.8jrelibjfxswt.jar;D:itjdk1.8jrelibjsse.jar;D:itjdk1.8jrelibmanagement-agent.jar;D:itjdk1.8jrelibplugin.jar;D:itjdk1.8jrelib esources.jar;D:itjdk1.8jrelib t.jar;F:springboot hreaddemooutproduction hreaddemo;D:itideaIntelliJ IDEA 2016.3.3libidea_rt.jar" com.intellij.rt.execution.application.AppMain com.cky.test.Test
构造方法的打印：main
run方法的打印main

Process finished with exit code 0

结果分析：MyFirstThread类的构造函数是被main线程调用的，而run方法是被名为Thread-0的线程调用的，run方法是自动调用的方法。

下面测试一个比较复杂的情况

 1 package com.cky.thread;
 2 
 3 /**
 4  * Created by edison on 2017/11/28.
 5  */
 6 public class CountOperate extends Thread {
 7 
 8     public CountOperate() {
 9         System.out.println("countbegin");
10         //执行构造方法的线程式main线程
11         System.out.println("Thread Name="+ Thread.currentThread().getName());
12         //当前定义这个线程的名字
13         System.out.println("this.name="+this.getName());
14         System.out.println("runend");
15     }
16     @Override
17     public void run() {
18         super.run();
19         System.out.println("runbegin");
20         //执行run方法的这个线程是A线程
21         System.out.println("Thread Name="+Thread.currentThread().getName());
22         //当前定义这个线程的名字
23         System.out.println("this.name="+this.getName());
24         System.out.println("runend");
25     }
26 }

View Code

 1 package com.cky.test;
 2 
 3 import com.cky.thread.CountOperate;
 4 
 5 /**
 6  * Created by edison on 2017/11/28.
 7  */
 8 public class Test13 {
 9     public static void main(String[] args) {
10         CountOperate c = new CountOperate();
11         Thread thread = new Thread(c);
12         thread.setName("A");
13         thread.start();
14     }
15 }

 1 C:itsoftjdkinjava -Didea.launcher.port=7532 "-Didea.launcher.bin.path=C:itsoftideaIntelliJ IDEA 2016.3.3in" -Dfile.encoding=UTF-8 -classpath "C:itsoftjdkjrelibcharsets.jar;C:itsoftjdkjrelibdeploy.jar;C:itsoftjdkjrelibextaccess-bridge-32.jar;C:itsoftjdkjrelibextcldrdata.jar;C:itsoftjdkjrelibextdnsns.jar;C:itsoftjdkjrelibextjaccess.jar;C:itsoftjdkjrelibextjfxrt.jar;C:itsoftjdkjrelibextlocaledata.jar;C:itsoftjdkjrelibext
ashorn.jar;C:itsoftjdkjrelibextsunec.jar;C:itsoftjdkjrelibextsunjce_provider.jar;C:itsoftjdkjrelibextsunmscapi.jar;C:itsoftjdkjrelibextsunpkcs11.jar;C:itsoftjdkjrelibextzipfs.jar;C:itsoftjdkjrelibjavaws.jar;C:itsoftjdkjrelibjce.jar;C:itsoftjdkjrelibjfr.jar;C:itsoftjdkjrelibjfxswt.jar;C:itsoftjdkjrelibjsse.jar;C:itsoftjdkjrelibmanagement-agent.jar;C:itsoftjdkjrelibplugin.jar;C:itsoftjdkjrelib
esources.jar;C:itsoftjdkjrelib
t.jar;C:多线程核心技术第一章outproduction第一章;C:itsoftideaIntelliJ IDEA 2016.3.3libidea_rt.jar" com.intellij.rt.execution.application.AppMain com.cky.test.Test13
 2 countbegin
 3 Thread Name=main
 4 this.name=Thread-0
 5 runend
 6 runbegin
 7 Thread Name=A
 8 this.name=Thread-0
 9 runend
10 
11 Process finished with exit code 0

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原文地址：https://www.cnblogs.com/edison20161121/p/7954603.html