Several methods of [Java multithreading] thread

Mu Xin 2021-11-25 18:30:53
methods java multithreading thread

Catalog

1. start() Method

2. run() Method

3. currentThread() Method

4. isActive() Method

5. sleep() Method

6. getId() Method


1. start() Method

Causes this thread to start executing ;Java The virtual machine calls the run() Method .

The result is two threads running at the same time : Current thread ( Return from call to start Method ) And another thread ( To perform its run Method ).

It is illegal to start a thread more than once .  Specially , Once the thread completes execution, it may not restart .

abnormal :IllegalThreadStateException - If the thread has started .

// Source code , Definition
public synchronized void start() {
/**
* This method is not invoked for the main method thread or "system"
* group threads created/set up by the VM. Any new functionality added
* to this method in the future may have to also be added to the VM.
*
* A zero status value corresponds to state "NEW".
*/
if (threadStatus != 0)
throw new IllegalThreadStateException();
/* Notify the group that this thread is about to be started
* so that it can be added to the group's list of threads
* and the group's unstarted count can be decremented. */
group.add(this);
boolean started = false;
try {
start0();
started = true;
} finally {
try {
if (!started) {
group.threadStartFailed(this);
}
} catch (Throwable ignore) {
/* do nothing. If start0 threw a Throwable then
it will be passed up the call stack */
}
}
}

2. run() Method

If this thread is used separately Runnable Running object constructed , be Runnable Object's run Method ; otherwise , This method does nothing and returns .

Thread Of Thread This method should be overridden .

// Source code ,Java
public void run() {
if (target != null) {
target.run();
}
}

3. currentThread() Method

This method can return information about which thread the code segment is being called .

// Method source code definition
public static native Thread currentThread();

4. isActive() Method

Test whether the thread is active .

【 notes 】: Activity status , That is, the thread has been started and has not been terminated .

// Source code , Definition
public final native boolean isAlive();

In the use of isAlive( When the method is used , If the thread object is passed to... As a construction parameter Thread Object to carry out start() Startup time , The result of the run is different from the previous example . The reason for this difference still comes from Thread.currentThread() and this The difference of .

5. sleep() Method

Makes the current... Within the specified number of milliseconds ” Executing thread “ Sleep ( Suspend execution ). This ” Executing thread “ Refer to this.currentThread() Thread returned .

// Source code , Definition
public static native void sleep(long millis) throws InterruptedException;

abnormal :

IllegalArgumentException - If  millis The value is negative. .

InterruptedException - If any thread interrupts the current thread .  When this exception is thrown , Of the current thread Interrupt state Will be removed .

6. getId() Method

Get the unique ID of the thread .

// Source code , Definition
public long getId() {
return tid;
}
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本文为[Mu Xin]所创,转载请带上原文链接,感谢
https://javamana.com/2021/11/20211109101849554y.html

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