Java 为没有字段的类创建构造函数

我试图创建一个抽象类（Shape）和三个子类（Square、Circle、Triangle），每个子类都没有字段和一个void方法--“drawShape”--用星号绘制每个形状。然后，在我的主方法中，我应该创建每个Shape子类对象的数组，并循环调用它们的drawShape方法。不幸的是，我一直收到错误：

文件：C:\Users\Robert\Demo.java[行：13]
错误：令牌上的语法错误，构造错误

我的问题是如何创建这些形状对象，以及如何实现循环以在这些对象的数组中调用它们的drawShape方法

public abstract class Shape
{
  public abstract void drawShape();
}

public class Square extends Shape
{
  @Override
  public void drawShape()
  {
    System.out.println("****\n" + "*  *\n*  *\n****");
  }
}

public class Circle extends Shape
{
  @Override
  public void drawShape()
  {
    System.out.println("   " + "*" + "\n  " + "* *" + "\n " + 
                       "*   *" + "\n  " + "* *" + "\n   " + "*");
  }
    }

public class Triangle extends Shape
{
  @Override
  public void drawShape()
  {
    System.out.println("   " + "*" + "   " +
                       "\n  " + "* *" + "  " + 
                       "\n " + "***" + " ");
  }
}

public class Demo
{
  public static void main(String[] args)
  {
    Triangle triangle = new Triangle();
    Circle circle = new Circle();
    Square square = new Square();
    Shape[] shapes = new Shape{triangle, circle, square};
    //How can I properly create this array^
    //How can I loop through the array to call each objects drawShape method

  }
}

像这样：

Shape[] shapes = new Shape[] {triangle, circle, square};

---

这：

Shape[]shapes=新形状{三角形、圆形、正方形}需要变成：
Shape[]shapes=新形状[]{三角形、圆形、正方形}

数组对象在Java中是一个
Iterable
。这意味着您可以使用修改后的
for
循环来遍历它：

for(Shape shape : shapes)
    shape.drawShape();

使用方法如下：

Shape triangle = new Triangle();
Shape circle = new Circle();
Shape square = new Square();

Shape[] shapes = new Shape[] {triangle, circle, square};
Arrays.stream(shapes).forEach(Shape::drawShape);

我感谢你的帮助！