以下のコードにスレッドのスケルトンがあります。シンプルなカウントダウン ラッチを使用しました。スレッド 2 に応じてスレッド 1 が完了している状況に陥っています。例外がなければ、コードは正しく実行されます。しかし、例外の可能性はもっと高くなります。スレッド 2 またはいずれかのスレッドで例外が発生した場合は、すべてのスレッドの実行を停止する必要があります。私の独立したスレッドは、例外の後でも実行を続けます。また、スレッド 1 でフラグを使用して、スレッド 2 で例外が発生したかどうかを確認しました。例外をテストする例として、ゼロ除算の例外を意図的に配置しました。これに対する解決策が見つかりません。私を助けてください..！
import java.util.concurrent.CountDownLatch;
public class MainThread extends Thread{
static boolean flag=false;
final static CountDownLatch latch1= new CountDownLatch(1);
final static CountDownLatch latch2= new CountDownLatch(1);
final static CountDownLatch latch3= new CountDownLatch(3);
static MainThread t1;
static MainThread t2;
static MainThread t3;
static MainThread t4;
static MainThread t5;
public static void main(String args[]){
t1 = new MainThread(){
public void run(){
System.out.println("Waiting for Thread 2");
try {
System.out.println("THis iss before the thread 2 starts its for loop.");
latch2.countDown();
t3.start();
t4.start();
t5.start();
System.out.println("waiting for thread 2 to countdown");
latch1.await();
if(flag==true){
System.out.println("successful.");
}
else{
System.out.println("error.");
}
} catch (InterruptedException e) {
// TODO Auto-generated catch block
e.printStackTrace();
}
System.out.println("All the dependencies resolved.");
System.out.println("Waiting for the remaining threads to complete their work.");
try {
latch3.await();
} catch (InterruptedException e) {
// TODO Auto-generated catch block
e.printStackTrace();
}
System.out.println("All the threads have finished doing their work. Exiting now...");
}
};
Thread t2 = new MainThread(){
public void run(){
System.out.println("Before Starting for loop");
try {
System.out.println("waiting for thread 1 to countdown latch2");
latch2.await();
System.out.println("Starting for loop");
for(int i=0;i<5;i++){
System.out.println("iteration: "+i);
try {
Thread.sleep(5);
} catch (InterruptedException e) {
// TODO Auto-generated catch block
e.printStackTrace();
}
}
int x=1/0;
latch1.countDown();
System.out.println("countdown by thread2 for latch 1 done.");
flag=true;
} catch (InterruptedException e) {
// TODO Auto-generated catch block
e.printStackTrace();
}
finally{
latch1.countDown();
}
}
};
t3 = new MainThread(){
public void run(){
System.out.println("Running Thread 3");
for(int i=0;i<10;i++){
System.out.println("iteration: "+i+ " "+t3.getName());
try {
Thread.sleep(5);
} catch (InterruptedException e) {
// TODO Auto-generated catch block
e.printStackTrace();
}
}
latch3.countDown();
}
};
t4 = new MainThread(){
public void run(){
System.out.println("Running Thread 4");
for(int i=0;i<10;i++){
System.out.println("iteration: "+i+ " "+t4.getName());
try {
Thread.sleep(5);
} catch (InterruptedException e) {
// TODO Auto-generated catch block
e.printStackTrace();
}
}
latch3.countDown();
}
};
t5 = new MainThread(){
public void run(){
System.out.println("Running Thread 5");
for(int i=0;i<10;i++){
System.out.println("iteration: "+i+ " "+t5.getName());
try {
Thread.sleep(5);
} catch (InterruptedException e) {
// TODO Auto-generated catch block
e.printStackTrace();
}
}
latch3.countDown();
}
};
t1.start();
t2.start();
}
}
私の出力は次のとおりです。
Before Starting for loop
waiting for thread 1 to countdown latch2
Waiting for Thread 2
THis iss before the thread 2 starts its for loop.
Starting for loop
iteration: 0
waiting for thread 2 to countdown
Running Thread 3
iteration: 0 Thread-2
Running Thread 5
iteration: 0 Thread-4
Running Thread 4
iteration: 0 Thread-3
iteration: 1
iteration: 1 Thread-3
iteration: 1 Thread-2
iteration: 1 Thread-4
iteration: 2
iteration: 2 Thread-3
iteration: 2 Thread-2
iteration: 2 Thread-4
iteration: 3
iteration: 3 Thread-3
iteration: 3 Thread-2
iteration: 3 Thread-4
iteration: 4
iteration: 4 Thread-3
iteration: 4 Thread-4
iteration: 4 Thread-2
iteration: 5 Thread-3
error.
All the dependencies resolved.
Waiting for the remaining threads to complete their work.
Exception in thread "Thread-1" java.lang.ArithmeticException: / by zero
at ThreadProjectStructure.MainThread$2.run(MainThread.java:72)
iteration: 5 Thread-4
iteration: 5 Thread-2
iteration: 6 Thread-3
iteration: 6 Thread-4
iteration: 6 Thread-2
iteration: 7 Thread-3
iteration: 7 Thread-2
iteration: 7 Thread-4
iteration: 8 Thread-3
iteration: 8 Thread-2
iteration: 8 Thread-4
iteration: 9 Thread-3
iteration: 9 Thread-4
iteration: 9 Thread-2
All the threads have finished doing their work. Exiting now...