point.java

java 初学者学习实例

// Fig. 9.4: Point.java
// Point class declaration represents an x-y coordinate pair.

public class Point {
   private int x; // x part of coordinate pair
   private int y; // y part of coordinate pair

   // no-argument constructor
   public Point()
   {
      // implicit call to Object constructor occurs here
   } 

   // constructor
   public Point( int xValue, int yValue )
   {
      // implicit call to Object constructor occurs here
      x = xValue;  // no need for validation
      y = yValue;  // no need for validation
   } 
 
   // set x in coordinate pair
   public void setX( int xValue )
   {
      x = xValue;  // no need for validation
   } 

   // return x from coordinate pair
   public int getX()
   {
      return x;
   } 

   // set y in coordinate pair
   public void setY( int yValue )
   {
      y = yValue;  // no need for validation
   } 

   // return y from coordinate pair
   public int getY()
   {
      return y;
   } 

   // return String representation of Point object
   public String toString()
   {
      return "[" + x + ", " + y + "]";
   } 

} // end class Point

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