private volatile int I = 0；

Total private variable length = 0;

Private boolean value completed = false

Public invalid increase () {

Synchronization (this) {

system . out . println(thread . current thread()。 GetName()+ "increasing)); //The auxiliary viewing results can be commented out.

if(++ I & lt； = 1000)

total+= I；

Otherwise {

this.completed = true

this . notifyall()； //Wake up the main thread

}

}

}

public long getTotal(){

Return this.total

}

public boolean isCompleted(){

Returns this.completed

}

}

Public class DigitalIncrease extension thread (

Digital = null

DigitalIncrease {

this.digital = digtal

start()；

}

Public invalid operation () {

while(true){

if(digital.isCompleted())

Break; //If the addition operation has been completed, exit the thread.

digital . increase()；

}

}

Public static void main(String [] args){

Digital = newdigital ();

digital increase[]diaarray = new digital increase[ 10]；

for(int I = 0； I< 10; i++){

DiArray[i]= new number increment (number); //Create 10 threads

}

//If the addition is not completed, let the main thread wait.

Try {

Synchronization (digital) {

And (! digital.isCompleted())

digital.wait()。

}

}catch (InterruptedException e) {

e . printstacktrace()；

}

system . out . println(digital . gettotal())；

}

}