listpoint.java

来自「Beginning Java 2, SDK 1.4 Edition Exerci」· Java 代码 · 共 34 行

// Chapter 6 Exercises 1 & 2

public class ListPoint extends Point {
  ListPoint next;    // Points to next point in the list.

  // Constructor to create an object from coordinates:
  
public ListPoint(double x, double y) {
    super(x, y);    // Call Point constructor.
    next = null;    // Set next as end point.
  }

  // Constructor to create an object from a Point object:
  public ListPoint(Point point) {
    super(point);
    next = null;
  }

  // Set the pointer to the next ListPoint:
  public void setNext(ListPoint next) {
    this.next = next;
  }

  // Get the next point in the list:
  public ListPoint getNext() {
    return next;
  }

  // Return class name & coordinates:
  public String toString() {
    return "ListPoint " + x + "," + y;
  }
}