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public class TestOverride{ public static void main(String args[]){ Sup s = new Sub(); Sub ss = new Sub(); s.doit(); s.something(s); s.something(ss); s.anything(); ss.something(s); ss.something

静态变量 非静态内部类

Java Exception Types of Exception There are mainly two types of exceptions: checked and unchecked where error is considered as unchecked exception.