Java Join Thread Control usage _java

JDK Description:

Join
Public final void Join ()
Throws Interruptedexception waits for the thread to terminate.

Thrown:
Interruptedexception-If any thread interrupts the current thread. When the exception is thrown, the interrupt state of the current thread is cleared
Test code:

Copy Code code as follows:

public class Mythread extends Thread {

public static void Main (string[] args) throws Interruptedexception {
A a=new a ();
b b=new B ();
A.start ();
A.join ();
B.start ();

}
}
Class A extends thread{

public void Run () {
for (int i=0;i<10000;i++) {
System.out.print ("A" +i);
}
}
}

Class B extends thread{

public void Run () {
for (int i=0;i<10000;i++) {
System.out.print ("B" +i);
}
}
}

You can see that thread B does not begin executing until thread a finishes

Very clear is not hehe