Java 22-5 multi-thread gets and sets the name of the thread object

How do I get the name of a thread object?
Public final String GetName (): gets the name of the Thread.
How do I set the name of a thread object?
Public final void SetName (String name): Sets the name of the thread
How do I get the name of a thread object in a subclass other than the thread class?
public static thread CurrentThread (): returns the currently executing thread object
Thread.CurrentThread (). GetName ()

Public final String GetName (): gets the name of the Thread.

This method is written in the custom thread class, which is also the subclass of Thread:

1  public classMyThreadextendsThread {2 3      public voidRun () {4         5          for(intx = 0; X < 100; X + +){6System.out.println (getName ()+"--"+x);7         }8     }9 Ten}

then, write the test class again:

1  public classMyThreadDemo1 {2 3      public Static voidmain (string[] Args) {4 5         //Create two Thread objects6MyThread MT1 =NewMyThread ();7MyThread mt2 =NewMyThread ();8           9 Mt1.start ();Ten Mt2.start (); one     } a  -}

Results:

thread-1--0
thread-0--0
Thread-0--1
Thread-0--2 ...

As you can see, the default name given to threads in thread is Thread-x

so, Why is the default name thread-x?

First of all, Mythread is a subclass of thread, so we go first with the parameterless construct of Thread:

class extends Thread {    public  MyThread () {        Super();    }

Next look at the source code of the thread about GetName () and SetName ():

1 classThread {2     Private Charname[];3 4      publicThread () {5InitNULL,NULL, "thread-" + nextthreadnum (), 0);6} Walk this Nextthreadnum (),//Look Down. so, get the name from Here: thread-0/-1 ... 7     8     Private voidinit (threadgroup g, Runnable target, String name,9                       LongStackSize) {TenInit (g, target, name, stackSize,NULL);//here again the Init () method is called, see below one     } a      -      Private voidinit (threadgroup g, Runnable target, String name, -                       LongstackSize, AccessControlContext ACC) { the         //Most of the code is Omitted. -          this. Name = Name.tochararray ();//convert the resulting string class thread-0/-1 into a character array and then give the array to private char name[]; -     } -      +      public Final voidsetName (String Name) { -          this. Name =Name.tochararray (); +}//This is the change of the name of the thread itself, directly the name of the input string class, converted to a character array, and then assigned to the private char name[]; a      at      -     Private Static intthreadinitnumber;//0,1,2 -     Private Static synchronized intnextthreadnum () { -         returnthreadinitnumber++;//return 0,1 -     } -      in      public FinalString getName () { -         returnstring.valueof (name); to}//the name you get here is the string class. +}

Public final void SetName (String name): Sets the name of the thread

Method 1: Non-parametric Construction +setxxx () (recommended)

1  public classMyThreadDemo1 {2 3      public Static voidmain (string[] Args) {4 5         //Create two Thread objects6MyThread MT1 =NewMyThread ();7MyThread mt2 =NewMyThread ();8          9// call method Set thread name  mt1.setname ("husky"); Mt2.setname ("samoyed");            a          - Mt1.start (); - Mt2.start (); the         //The result is a simultaneous execution of 2 print 0-1000 threads -     } -  -}

Method 2: take the constructor method to name the thread

　　You first have to add the custom thread class:

1      public MyThread () {2    }3     4      public MyThread (String Name) {5         Super (name); 6     }

Because this class does not have a parameter construction method, it must be created to use the parameter construct

The test class can call the constructor directly by Name:

1 New MyThread ("husky"); 2  New MyThread ("samoyed");

What if you want to get the name of the thread object where the Main method resides?
In this case, the thread class provides this method:
public static thread CurrentThread (): returns the currently executing thread object
System.out.println (thread.currentthread (). getName ());

In the test class, add

System.out.println (thread.currentthread (). getName ());

The output is: main, because the Java Execution program defaults to main

Java 22-5 multi-thread gets and sets the name of the thread object