Java静态代码块(static block)调用陷阱小记

Base.java

//父类
public class Base {
      
    public static String who = "Mr. Base";
      
    Base(){
    }
    static {
        System. out.println("static block in Base" );
    }
    public static void functionInBase(){
        System. out.println("static function in Base! -- " + who);
    }
    public void showWho(){
        System. out.print(who);
    }
}

Extend.java

//子类
public class Extend extends Base{
      
    public static String who = "Mr. Extend";
      
    static {
        System. out.println("static block in Extend" );
    }
    public static void functionInExtend(){
        System. out.println("static function in Extend!" );
    } 
    Extend(){
        super();
    }
}

Main.java

//测试类
public class Main {

    public static void main(String[] args) {
                        
        Extend.functionInBase();
        Extend ex = new Extend();
        ex.showWho();
        System. out.println(Extend.who);
    }
}