我如何创建抽象对象 class？

Question

为什么 GeometricObject[] abstractObjects = new GeometricObject[10]; 不会导致我创建抽象对象 class 的错误？
A[] objects;和A[] objects = new A[7];有什么区别

public class Test
{
    public static void main(String[] args)
    {
        int[] numbers = new int[8];
        A[] objects = new A[7];
        GeometricObject[] abstractObjects = new GeometricObject[10];
        System.out.println(numbers[3]); // prints 0
        System.out.println(objects[4]); // prints null
        System.out.println(abstractObjects[6]); // prints null
    }
}

abstract class GeometricObject {}

class A
{
    public int number;
    A()
    {
        number = 13;
    }
}

Answer 1

 GeometricObject[] abstractObjects = new GeometricObject[10];

您不是在此处创建 GeometricObject 的对象。您正在创建一个数组对象（GeometricObject class 类型）。

What's the difference between A[] objects; and A[] objects = new A[7];

A[] objects = new A[2]分为两部分

A[] objects - 它称为物体减速。

new A[7] - 调用了对象的初始化

我如何创建抽象对象 class？

How I created objects of an abstract class?

java

abstract-class

class