张恒的博客

定义三个类，关系如下 class A {} class B extends A {} class C extends B {} 测试三个方法instanceof、isInstance、isAssignableFrom 测试代码如下 A a = new C(); B b = new C(); C c = new C(); System.out.println(a inst...

public class ATest { static { System.out.println("this is A static"); } { System.out.println("this is A {}"); } public ATest() { System.out.println("thi...