try {
throw new ExampleB("b")
} catch(ExampleA e){
System.out.println("ExampleA");
} catch(Exception e){
System.out.println("Exception");
}
请问执行此段代码的输出是什么?
答:输出:ExampleA。(根据里氏代换原则[能使用父类型的地方一定能使用子类型],抓取ExampleA类型异常的catch块能够抓住try块中抛出的ExampleB类型的异常) 面试题 - 说出下面代码的运行结果。(此题的出处是《Java编程思想》一书) class Annoyance extends Exception {}
class Sneeze extends Annoyance {} class Human { public static void main(String[] args)
throws Exception {
try {
try {
throw new Sneeze();
}
catch ( Annoyance a ) {
System.out.println("Caught Annoyance");
throw a;
}
}
catch ( Sneeze s ) {
System.out.println("Caught Sneeze");
return ;
}
finally {
System.out.println("Hello World!");
}
}
}

我 输出的答案是

Caught Annoyance
Caught Sneeze
Hello World!
即子类可以捕获到父类的异常

04-25 23:21