线程优先级设置：setPriority（int value） 括号参数是1-10级别。1代表最低级别，10代表最高级别。小于1或大于10，会抛出IllegalArgumentException异常。
JDK源代码优先级定义如下：
public final void setPriority(int newPriority) {
ThreadGroup g;
checkAccess();
if (newPriority > MAX_PRIORITY || newPriority < MIN_PRIORITY) {
throw new IllegalArgumentException();
}
if((g = getThreadGroup()) != null) {
if (newPriority > g.getMaxPriority()) {
newPriority = g.getMaxPriority();
}
setPriority0(priority = newPriority);
}
}
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