海子牛

sub class must call base class's constructor sub class will invoke base class's constructor implicityly if super constructor is undefined, must explicitly invoke another constructor 子类以一...

public > protected > package >private [code="sh"] Access Levels Modifier Class Package Subclass World public Y Y Y Y protected Y Y Y N no modifier Y Y ...

摘自 Java Language Specification The null reference can always be cast to any reference type.In practice, the programmer can ignore the null type and just pretend that null is merely a special literal...

array to list [code="java"] List list = Arrays.asList(array); [/code] decouple try catch and try finally [code="java"] try{ try{ //code } finally{ //code } catch(Excepti...