Question

我有一个抽象类GeometricObject，它由一个基类Rectangle扩展。在超类中，我提供了两个构造函数：

  public abstract class GeometricObject {
  private String color = "white";
  private boolean filled;
  private java.util.Date dateCreated;

  /** Construct a default geometric object */
  protected GeometricObject() {
    dateCreated = new java.util.Date();
  }

  /** Construct a geometric object with color and filled value */
  protected GeometricObject(String color, boolean filled) {
    dateCreated = new java.util.Date();
    this.color = color;
    this.filled = filled;
  }

在矩形类中，我创建了另一个构造函数，它应该调用GeometricObject参数构造函数。如果我错了，请纠正我，但这是为＆＃34; color＆＃34;提供价值的正确方法。和＆＃34;填充＆＃34;对于Rectangle对象。

public class Rectangle extends GeometricObject implements Comparable<Rectangle>{
  private double width;
  private double height;

  public Rectangle() {
  }

  **public Rectangle(double width, double height, String color, boolean filled) {
    super(color, filled);
    this.width = width;
    this.height = height;
  }**

但是，Eclipse在super（color，filled）语句旁边给出了以下错误：＆＃34;构造函数GeometricObject（String，boolean）未定义＆＃34;

我错过了什么？

Answer 1

构造函数调用看起来很好，我在Eclipse中尝试过，它编译时没有任何错误。但是，当Rectangle类实现Comparable时，我们需要覆盖compareTo方法，如下所示：

@Override
public int compareTo(Rectangle o) {
    // TODO Auto-generated method stub
    return 0; //should be replaced by comparison logic
}

Java - 构造函数未定义

1 个答案: