在 Java 中命名一个线程并获取当前线程的名称
原文:https://www . geesforgeks . org/naming-thread-取数-name-current-thread-java/
线程可以被称为轻量级进程。线程使用更少的资源在进程中创建和存在；线程共享进程资源。Java 的主线程是程序启动时启动的线程。现在让我们讨论一下用什么方法命名一个线程的古怪概念。
方法:我们可以通过两种方式来设置名称，可以是直接设置，也可以是间接设置，我们将通过这两种方式来查看名称。
- Create a thread and pass the thread name (direct method)
- Use the setName () method of the thread class (indirect method)
方法 1: 创建线程并传递线程的名称
它是 java 中一种直接命名线程的方法，每个线程都有一个名字，那就是:Thread-0，Thread-1，Thread-2，…。等等。Java 提供了一些改变线程名称的方法。设置线程名基本上有两种方法。这两种方法都在 java.lang.Thread 类中定义。
极客，现在你一定想知道如何直接设置线程的名称？在 java 中，我们可以在创建线程时设置线程名称，并绕过线程名称作为参数，如下例所示:
示例:
Java
// Java Program Illustrating How to Set the name
// of Thread at time of Creation
// Importing I/O classes from java.io package
import java.io.*;
// Class 1
// Helper class
class ThreadNaming extends Thread {
// Parametrized constructor
ThreadNaming(String name)
{
// Call to constructor of
// the Thread class as super keyword
// refers to parent class
super(name);
}
// run() method for thread
@Override public void run()
{
// Print statement when thread is called inside
// main()
System.out.println("Thread is running.....");
}
}
// Class 2
// Main class
class GFG {
// main driver method
public static void main(String[] args)
{
// Creating two threads
ThreadNaming t1 = new ThreadNaming("geek1");
ThreadNaming t2 = new ThreadNaming("geek2");
// Getting the above created threads names.
System.out.println("Thread 1: " + t1.getName());
System.out.println("Thread 2: " + t2.getName());
// Starting threads using start() method
t1.start();
t2.start();
}
}
输出
Thread 1: geek1
Thread 2: geek2
Thread is running.....
Thread is running.....
方式二: 使用线程类的 setName()方法
我们可以通过调用线程对象上的 setName 方法来设置(更改)线程的名称。它将更改线程的名称。
语法:
public final void setName(String name)
参数:指定线程名称的字符串
示例:
Java 语言(一种计算机语言，尤用于创建网站)
// Java Program Illustrating How to Get and Change the
// Name of a Thread
// Importing input output classes
import java.io.*;
// Class 1
// Helper class extending Thread class
class ThreadNaming extends Thread {
// run() method for thread which is called
// as soon as start() is called over threads
@Override public void run()
{
// Print statement when run() is called over thread
System.out.println("Thread is running.....");
}
}
// Class 2
// Main class
class GFG {
// Main driver method
public static void main(String[] args)
{
// Creating two threads via above class
// as it is extending Thread class
ThreadNaming t1 = new ThreadNaming();
ThreadNaming t2 = new ThreadNaming();
// Fetching the above created threads names
// using getName() method
System.out.println("Thread 1: " + t1.getName());
System.out.println("Thread 2: " + t2.getName());
// Starting threads using start() method
t1.start();
t2.start();
// Now changing the name of threads
t1.setName("geeksforgeeks");
t2.setName("geeksquiz");
// Again getting the new names of threads
System.out.println(
"Thread names after changing the "
+ "thread names");
// Printing the above names
System.out.println("New Thread 1 name: "
+ t1.getName());
System.out.println("New Thread 2 name: "
+ t2.getName());
}
}
Output
Thread 1: Thread-0
Thread 2: Thread-1
Thread is running.....
Thread names after changing the thread names
New Thread 1 name: geeksforgeeks
New Thread 2 name: geeksquiz
Thread is running.....
如何获取当前线程的名称？
现在让我们详细讨论获取当前线程的名称。我们可以在创建线程时获取当前线程的名称，并绕过线程的名称作为参数。
方法:T2【currentThread()
它是在 java.langThread 类中定义的。
返回类型:返回对当前执行线程的引用
语法:
public static Thread currentThread()
示例:
Java
// Java program to Illustrate How to Get Name of
// Current Executing thread
// Using getName() Method
// Importing reqiored I/O classes
import java.io.*;
// Class 1
// Helper class extending to Thread class
class ThreadNaming extends Thread {
// run() method for this thread
@Override public void run()
{
// Display message
System.out.println(
"Fetching current thread name..");
// Getting the current thread name
// using getname() method
System.out.println(
Thread.currentThread().getName());
}
}
// Class 2
// Main class
class GFG {
// Main method driver
public static void main(String[] args)
{
// Creating two threads inside main() method
ThreadNaming t1 = new ThreadNaming();
ThreadNaming t2 = new ThreadNaming();
// Starting threads using start() method which
// automatically calls run() method
t1.start();
t2.start();
}
}
输出
Fetching current thread name..
Thread-0
Fetching current thread name..
Thread-1
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