http://www.tutorialspoint.com/java/java_overriding.htm
http://docs.oracle.com/javase/tutorial/java/IandI/override.html
Java中overriding的规则(二)
tB test3(int a, int b) {
System.out.println("sub");
return null;
}
@Override
protected TestB test4(int a, int b) {
System.out.println("sub");
return null;
}
@Override
public TestB test5(int a, int b) {
System.out.println("sub");
return null;
}
// fail
// @Override
// protected TestA test6(int a, TestB b) {
// System.out.println("sub");
// return null;
// }
@Override
protected TestA test6(int a, TestA b) {
System.out.println("sub");
return null;
}
@Override
protected TestA test6(int a, int b) {
System.out.println("sub");
return null;
}
// fail: This instance method cannot override the static method
// protected TestA test7(int a, int b) {
// System.out.println("sub");
// return null;
// }
// fail: can not throw checked exception
// @Override
// protected TestA test8(int a, int b) throws Exception {
// System.out.println("sub");
// return null;
// }
@Override
protected TestA test8(int a, int b) throws NullPointerException {
System.out.println("sub");
return null;
}
// fail:Exception Throwable is not compatible with throws
// clause in TestA.test8(int, int)
// @Override
// protected TestA test8(int a, int b) throws Throwable {
// System.out.println("sub");
// return null;
// }
// OK
// @Override
// protected TestA test9(int a, int b) throws Exception{
// System.out.println("sub");
// return null;
// }
// OK
// @Override
// protected TestA test9(int a, int b) throws Error{
// System.out.println("sub");
// return null;
// }
@Override
protected TestA test9(int a, int b) throws NullPointerException{
System.out.println("sub");
return null;
}
// fail
// @Override
// protected TestA test9(int a, int b) throws Throwable{
// System.out.println("sub");
// return null;
// }
@Override
protected TestA test10(int a, int b) throws NullPointerException{
System.out.println("sub");
return null;
}
// fail
// @Override
// protected TestA test10(int a, int b) throws Exception{
// System.out.println("sub");
// return null;
// }
protected static TestA test11(int a, int b) {
System.out.println("supper");
return null;
}
}