子类已经覆盖了父类的静态方法，应该运行子类的静态方法才对呀？

package hidestatic;
class Base{
void method(){
system.out.println("method of Base");
}
static void staticMethod(){
System.out.println("static method of Base");
}
}
public class Sub extends Base{
void method(){
System.out.println("method of Sub");
}
static void staticMethod(){
System.out.println("static method of Sub");
}

public static void main(String args[]){
Base sub1=new Sub();
sub1.method();
sub1.staticMethod();

Sub sub2=new Sub();
sub2.method();
sub.staticMethod();
}
}

运行结果：method of Sub
static method of Base
method of Sub
static method of Sub


为什么：sub1.staticMethod()的运行结果是：static method of Base ? 按理说，子类已经覆盖父类的静态方法了，应该运行子类的静态方法才对呀，为什么还是调用父类的静态方法？