为什么父类调用的是子类的方法

Question

 class SuperClass{
    public SuperClass()
    {
        System.out.println("父类构造器");
    }
    {
        System.out.println("父类代码块");
    }
    static
    {
        System.out.println("父类静态代码块");
    }
    public static String fieldSuperA = printStaticField();
    public String fieldSuperB = printCommonField();
    static String printStaticField()
    {  
        System.out.println("父类静态成员变量A初始化");  
        return "";  
    }  
    String printCommonField()
    {  
        System.out.println("父类实例变量B初始化");  
        return "";  
    }  
} 

class SubClass extends SuperClass{
    public static String fieldSubA = printStaticField();
    public String fieldSubB = printCommonField();
    public SubClass(){
        System.out.println("子类的构造器");
    }
    {
        System.out.println("子类代码块");
    }
    static{
        System.out.println("子类静态代码块");
    }
    static String printStaticField(){  
        System.out.println("子类静态成员变量A初始化");  
        return "";  
    }  
    String printCommonField(){  
        System.out.println("子类实例变量B初始化");  
        return "";  
    }  
}

public class MemeberInitializationTest {
    public static void main(String[] args) {
        new SubClass();
    }
}

运行结果如下：

想知道为什么会出现这种情况。

Answer 1