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:\it\jdk1.8\bin\java -Didea.launcher.port=7532 '-Didea.launcher.bin.path=D:\it\idea\IntelliJ IDEA 2016.3.3\bin' -Dfile.encoding=UTF-8 -classpath 'D:\it\jdk1.8\jre\lib\charsets.jar;D:\it\jdk1.8\jre\lib\deploy.jar;D:\it\jdk1.8\jre\lib\ext\access-bridge-64.jar;D:\it\jdk1.8\jre\lib\ext\cldrdata.jar;D:\it\jdk1.8\jre\lib\ext\dnsns.jar;D:\it\jdk1.8\jre\lib\ext\jaccess.jar;D:\it\jdk1.8\jre\lib\ext\jfxrt.jar;D:\it\jdk1.8\jre\lib\ext\localedata.jar;D:\it\jdk1.8\jre\lib\ext\nashorn.jar;D:\it\jdk1.8\jre\lib\ext\sunec.jar;D:\it\jdk1.8\jre\lib\ext\sunjce_provider.jar;D:\it\jdk1.8\jre\lib\ext\sunmscapi.jar;D:\it\jdk1.8\jre\lib\ext\sunpkcs11.jar;D:\it\jdk1.8\jre\lib\ext\zipfs.jar;D:\it\jdk1.8\jre\lib\javaws.jar;D:\it\jdk1.8\jre\lib\jce.jar;D:\it\jdk1.8\jre\lib\jfr.jar;D:\it\jdk1.8\jre\lib\jfxswt.jar;D:\it\jdk1.8\jre\lib\jsse.jar;D:\it\jdk1.8\jre\lib\management-agent.jar;D:\it\jdk1.8\jre\lib\plugin.jar;D:\it\jdk1.8\jre\lib\resources.jar;D:\it\jdk1.8\jre\lib\rt.jar;F:\springboot\threaddemo\out\production\threaddemo;D:\it\idea\IntelliJ IDEA 2016.3.3\lib\idea_rt.jar' com.intellij.rt.execution.application.AppMain com.cky.test.TestmainProcess 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 @Override12 public void run() {13 super.run();14 System.out.println('run方法的打印' +Thread.currentThread().getName());15 }16 }

View Code

D:\it\jdk1.8\bin\java -Didea.launcher.port=7533 '-Didea.launcher.bin.path=D:\it\idea\IntelliJ IDEA 2016.3.3\bin' -Dfile.encoding=UTF-8 -classpath 'D:\it\jdk1.8\jre\lib\charsets.jar;D:\it\jdk1.8\jre\lib\deploy.jar;D:\it\jdk1.8\jre\lib\ext\access-bridge-64.jar;D:\it\jdk1.8\jre\lib\ext\cldrdata.jar;D:\it\jdk1.8\jre\lib\ext\dnsns.jar;D:\it\jdk1.8\jre\lib\ext\jaccess.jar;D:\it\jdk1.8\jre\lib\ext\jfxrt.jar;D:\it\jdk1.8\jre\lib\ext\localedata.jar;D:\it\jdk1.8\jre\lib\ext\nashorn.jar;D:\it\jdk1.8\jre\lib\ext\sunec.jar;D:\it\jdk1.8\jre\lib\ext\sunjce_provider.jar;D:\it\jdk1.8\jre\lib\ext\sunmscapi.jar;D:\it\jdk1.8\jre\lib\ext\sunpkcs11.jar;D:\it\jdk1.8\jre\lib\ext\zipfs.jar;D:\it\jdk1.8\jre\lib\javaws.jar;D:\it\jdk1.8\jre\lib\jce.jar;D:\it\jdk1.8\jre\lib\jfr.jar;D:\it\jdk1.8\jre\lib\jfxswt.jar;D:\it\jdk1.8\jre\lib\jsse.jar;D:\it\jdk1.8\jre\lib\management-agent.jar;D:\it\jdk1.8\jre\lib\plugin.jar;D:\it\jdk1.8\jre\lib\resources.jar;D:\it\jdk1.8\jre\lib\rt.jar;F:\springboot\threaddemo\out\production\threaddemo;D:\it\idea\IntelliJ IDEA 2016.3.3\lib\idea_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:\it\jdk1.8\bin\java -Didea.launcher.port=7534 '-Didea.launcher.bin.path=D:\it\idea\IntelliJ IDEA 2016.3.3\bin' -Dfile.encoding=UTF-8 -classpath 'D:\it\jdk1.8\jre\lib\charsets.jar;D:\it\jdk1.8\jre\lib\deploy.jar;D:\it\jdk1.8\jre\lib\ext\access-bridge-64.jar;D:\it\jdk1.8\jre\lib\ext\cldrdata.jar;D:\it\jdk1.8\jre\lib\ext\dnsns.jar;D:\it\jdk1.8\jre\lib\ext\jaccess.jar;D:\it\jdk1.8\jre\lib\ext\jfxrt.jar;D:\it\jdk1.8\jre\lib\ext\localedata.jar;D:\it\jdk1.8\jre\lib\ext\nashorn.jar;D:\it\jdk1.8\jre\lib\ext\sunec.jar;D:\it\jdk1.8\jre\lib\ext\sunjce_provider.jar;D:\it\jdk1.8\jre\lib\ext\sunmscapi.jar;D:\it\jdk1.8\jre\lib\ext\sunpkcs11.jar;D:\it\jdk1.8\jre\lib\ext\zipfs.jar;D:\it\jdk1.8\jre\lib\javaws.jar;D:\it\jdk1.8\jre\lib\jce.jar;D:\it\jdk1.8\jre\lib\jfr.jar;D:\it\jdk1.8\jre\lib\jfxswt.jar;D:\it\jdk1.8\jre\lib\jsse.jar;D:\it\jdk1.8\jre\lib\management-agent.jar;D:\it\jdk1.8\jre\lib\plugin.jar;D:\it\jdk1.8\jre\lib\resources.jar;D:\it\jdk1.8\jre\lib\rt.jar;F:\springboot\threaddemo\out\production\threaddemo;D:\it\idea\IntelliJ IDEA 2016.3.3\lib\idea_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 @Override17 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:\itsoft\jdk\bin\java -Didea.launcher.port=7532 '-Didea.launcher.bin.path=C:\itsoft\idea\IntelliJ IDEA 2016.3.3\bin' -Dfile.encoding=UTF-8 -classpath 'C:\itsoft\jdk\jre\lib\charsets.jar;C:\itsoft\jdk\jre\lib\deploy.jar;C:\itsoft\jdk\jre\lib\ext\access-bridge-32.jar;C:\itsoft\jdk\jre\lib\ext\cldrdata.jar;C:\itsoft\jdk\jre\lib\ext\dnsns.jar;C:\itsoft\jdk\jre\lib\ext\jaccess.jar;C:\itsoft\jdk\jre\lib\ext\jfxrt.jar;C:\itsoft\jdk\jre\lib\ext\localedata.jar;C:\itsoft\jdk\jre\lib\ext\nashorn.jar;C:\itsoft\jdk\jre\lib\ext\sunec.jar;C:\itsoft\jdk\jre\lib\ext\sunjce_provider.jar;C:\itsoft\jdk\jre\lib\ext\sunmscapi.jar;C:\itsoft\jdk\jre\lib\ext\sunpkcs11.jar;C:\itsoft\jdk\jre\lib\ext\zipfs.jar;C:\itsoft\jdk\jre\lib\javaws.jar;C:\itsoft\jdk\jre\lib\jce.jar;C:\itsoft\jdk\jre\lib\jfr.jar;C:\itsoft\jdk\jre\lib\jfxswt.jar;C:\itsoft\jdk\jre\lib\jsse.jar;C:\itsoft\jdk\jre\lib\management-agent.jar;C:\itsoft\jdk\jre\lib\plugin.jar;C:\itsoft\jdk\jre\lib\resources.jar;C:\itsoft\jdk\jre\lib\rt.jar;C:\多线程核心技术\第一章\out\production\第一章;C:\itsoft\idea\IntelliJ IDEA 2016.3.3\lib\idea_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 runend10 11 Process finished with exit code 0