使用Unsafe.getUnsafe（）抛出异常throwException(Throwing an Exception using Unsafe.getUnsafe().throwException)

 我在java.lang.Class＃newInstance0中遇到了一些有趣的代码： 
 
// Run constructor
try {
    return tmpConstructor.newInstance((Object[])null);
} catch (InvocationTargetException e) {
    Unsafe.getUnsafe().throwException(e.getTargetException());
    // Not reached
    return null;
}
 
 查看Unsafe.getUnsafe().throwException语句。 它看起来像一个检查的异常是从一个没有声明它被抛出的方法抛出的！ 
 
 他们为什么这么做？ 
 如果Sun开发人员可以使用这种技术，那么我们也可以这么做吗？ 

I came across some interesting code in java.lang.Class#newInstance0:
 
// Run constructor
try {
    return tmpConstructor.newInstance((Object[])null);
} catch (InvocationTargetException e) {
    Unsafe.getUnsafe().throwException(e.getTargetException());
    // Not reached
    return null;
}
 
Check out the Unsafe.getUnsafe().throwException statement. It looks like a checked exception is being thrown from a method which doesn't declare it to be thrown!
 
Why did they do this? 
 If the Sun developers can use this technique, is it ok for us to do so as well?

原文：https://stackoverflow.com/questions/4375828