研究生该怎么去学习相关的建模仿真，知道方法，有数据，但是不会搭模型写代码，不会处理数据，仅仅通过看文献够吗？
如果要捕获那些没被业务代码捕获的异常，可以设置Thread类的uncaughtExceptionHandler属性。这时使用ThreadFactoryBuilder会比较方便，ThreadFactoryBuilder是guava提供的ThreadFactory生成器。
new ThreadFactoryBuilder()
.setNameFormat("customThread %d")
.setUncaughtExceptionHandler((t, e) -> System.out.println(t.getName() + "发生异常" + e.getCause()))
.build()
修改之后：
public class ThreadExecutor {
private static ThreadPoolExecutor threadPoolExecutor = new ThreadPoolExecutor(1, 1, 60, TimeUnit.SECONDS,
new ArrayBlockingQueue<>(200),
new ThreadFactoryBuilder()
.setNameFormat("customThread %d")
.setUncaughtExceptionHandler((t, e) -> System.out.println("UncaughtExceptionHandler捕获到：" + t.getName() + "发生异常" + e.getMessage()))
.build());
@Test
public void test() {
IntStream.rangeClosed(1, 5).forEach(i -> {
try {
Thread.sleep(100);
} catch (InterruptedException e) {
e.printStackTrace();
}
threadPoolExecutor.execute(() -> {
System.out.println("线程" + Thread.currentThread().getName() + "执行");
int j = 1 / 0;
});
});
}
}
线程customThread 0执行
UncaughtExceptionHandler捕获到：customThread 0发生异常/ by zero
线程customThread 1执行
UncaughtExceptionHandler捕获到：customThread 1发生异常/ by zero
线程customThread 2执行
UncaughtExceptionHandler捕获到：customThread 2发生异常/ by zero
线程customThread 3执行
UncaughtExceptionHandler捕获到：customThread 3发生异常/ by zero
线程customThread 4执行
UncaughtExceptionHandler捕获到：customThread 4发生异常/ by zero
可见，结果并不是我们想象的那样，线程池中原有的线程没有复用！ 所以通过UncaughtExceptionHandler想将异常吞掉使线程复用这招貌似行不通。它只是做了一层异常的保底处理。
public class ThreadExecutor {
private static ThreadPoolExecutor threadPoolExecutor = new ThreadPoolExecutor(1, 1, 60, TimeUnit.SECONDS,
new ArrayBlockingQueue<>(200),
new ThreadFactoryBuilder()
.setNameFormat("customThread %d")
.setUncaughtExceptionHandler((t, e) -> System.out.println("UncaughtExceptionHandler捕获到：" + t.getName() + "发生异常" + e.getMessage()))
.build());
@Test
public void test() {
IntStream.rangeClosed(1, 5).forEach(i -> {
try {
Thread.sleep(100);
} catch (InterruptedException e) {
e.printStackTrace();
}
Future<?> future = threadPoolExecutor.submit(() -> {
System.out.println("线程" + Thread.currentThread().getName() + "执行");
int j = 1 / 0;
});
try {
future.get();
} catch (InterruptedException e) {
e.printStackTrace();
} catch (ExecutionException e) {
e.printStackTrace();
}
});
}
}
线程customThread 0执行
java.util.concurrent.ExecutionException: java.lang.ArithmeticException: / by zero
线程customThread 0执行
java.util.concurrent.ExecutionException: java.lang.ArithmeticException: / by zero
线程customThread 0执行
java.util.concurrent.ExecutionException: java.lang.ArithmeticException: / by zero
线程customThread 0执行
java.util.concurrent.ExecutionException: java.lang.ArithmeticException: / by zero
线程customThread 0执行
java.util.concurrent.ExecutionException: java.lang.ArithmeticException: / by zero
通过submit提交线程可以屏蔽线程中产生的异常，达到线程复用。当get()执行结果时异常才会抛出。
原因是通过submit提交的线程，当发生异常时，会将异常保存，待future.get();时才会抛出。
这是Futuretask的部分run()方法，看setException：
public void run() {
try {
Callable<V> c = callable;
if (c != null && state == NEW) {
V result;
boolean ran;
try {
result = c.call();
ran = true;
} catch (Throwable ex) {
result = null;
ran = false;
setException(ex);
}
if (ran)
set(result);
}
}
}
protected void setException(Throwable t) {
if (UNSAFE.compareAndSwapInt(this, stateOffset, NEW, COMPLETING)) {
outcome = t;
UNSAFE.putOrderedInt(this, stateOffset, EXCEPTIONAL); // final state
finishCompletion();
}
}
将异常存在outcome对象中，没有抛出，再看get方法：
public V get() throws InterruptedException, ExecutionException {
int s = state;
if (s <= COMPLETING)
s = awaitDone(false, 0L);
return report(s);
}
private V report(int s) throws ExecutionException {
Object x = outcome;
if (s == NORMAL)
return (V)x;
if (s >= CANCELLED)
throw new CancellationException();
throw new ExecutionException((Throwable)x);
}
当outcome是异常时才抛出。