JAVA throws规则

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class A extends Exception {}class B extends A {}abstract class I {void fevent() throws A {};void gent() throws B {};void hent() {};}class C extends Exception {}class D extends B {}interface II {//void fevent() throws C;  此处开放CC 继承将报错.}class CC extends I implements II {  CC() throws A,C {}}public class Test{public static void main(String[] args){Integer t = null;if(t == null){throw new NullPointerException();}System.out.println("END");}}子类Overrider 方法不能抛出比父类更多的异常。(主要为的是Upcast)

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