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/* Please try the NoviceExamples before the MultiMethodExamples
To compile:
   nicec --sourcepath=.. -a binarymethod.jar binarymethod
To run:
   java -jar binarymethod.jar
*/

equals(#Point p1, #Point p2) = 
   (p1.x==p2.x) && (p1.y==p2.y);

equals(#ColorPoint p1, #ColorPoint p2) = 
   (p1.x==p2.x) && (p1.y==p2.y) && (p1.c==p2.c);

class Point {
   double _x = 0.0;
   double _y = 0.0;

   double x() = _x;
   double y() = _y;

   double dist() = Math.sqrt(_x**2 + _y**2);

   alike closer(alike p){
      if (p.dist < this.dist) 
         return p;
      else
         return this;
   }
}

class ColorPoint extends Point {
   double _c = 0.0;

   double c() = _c;
}

void main(String[] args){ 
   var s = " ";
   let p = new Point(_x: 3.2, _y: 4.5);
   let q = new Point(_x: 3.2, _y: 4.5);
   let cp = new ColorPoint(_x: 3.2, _y: 4.5);  
   let cpq = new ColorPoint(_x: 3.2, _y: 4.5); 

   if (p.equals(q)) s = "equal"; else s = "NOT equal ";
   println("Point Point " + s);

   if (p.equals(cp)) s = "equal"; else s = "NOT equal ";
   println("Point ColorPoint " + s);

   if (cp.equals(p)) s = "equal"; else s = "NOT equal ";
   println("ColorPoint Point " + s);

   if (cp.equals(cpq)) s = "equal"; else s = "NOT equal ";
   println("ColorPoint ColorPoint " + s);


   if (p.equals( p.closer(q) )) s = "equal"; else s = "NOT equal ";
   println("\nPoint closer Point " + s);

   if (cp.equals( cp.closer(cpq) )) s = "equal"; else s = "NOT equal ";
   println("ColorPoint closer ColorPoint " + s);
}


/* Notes - language
See the detailed discussion of binary methods "On Binary Methods"
   http://citeseer.nj.nec.com/bruce95binary.html

   equals(#Point p1, #Point p2)
Implement "equals" for the case where both objects are instances
of Point (excluding subclasses of Point).


In a single dispatch language, like Java, we would have to explicitly
test that both objects were instances of Point, like this: 

   boolean equals(Object o){
      if (o instanceof Point)
         return (_x==p2.x) && (_y==p2.y);
      else 
         return false;
   }

   alike closer(alike p){
See the discussion of selftype in "On the Interaction of Object
Design Patterns and Programming Languages" p9
   http://citeseer.nj.nec.com/baumgartner96interaction.html
*/
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[http://www.shop263.com/i-49/228.htm 有机膨润土] [http://www.shop263.com/i-49/229.htm 有机铅稳定剂] [http://www.shop263.com/i-49/230.htm 有机试剂] [http://www.shop263.com/i-49/231.htm 有机烷基磷酸酯类增塑剂] [http://www.shop263.com/i-49/232.htm 有机颜料] [http://www.shop263.com/i-49/233.htm 有机载热体] [http://www.shop263.com/i-49/234.htm 有机助剂] [http://www.shop263.com/i-49/235.htm 有降粘剂] [http://www.shop263.com/i-49/236.htm 有颗粒活性炭] [http://www.shop263.com/i-49/237.htm 有色金属] [http://www.shop263.com/i-49/238.htm 有梭织机桨料] [http://www.shop263.com/i-49/239.htm 预膜剂] [http://www.shop263.com/i-49/240.htm 原煤破碎炭] [http://www.shop263.com/i-49/241.htm 原油破乳剂] [http://www.shop263.com/i-49/242.htm 原油脱钙剂] [http://www.shop263.com/i-49/243.htm 匀染剂] [http://www.shop263.com/i-49/244.htm 载银炭] [http://www.shop263.com/i-49/245.htm 暂时性湿强剂] [http://www.shop263.com/i-49/246.htm 早强剂] [http://www.shop263.com/i-49/247.htm 造纸分散剂] [http://www.shop263.com/i-49/248.htm 造纸化学品] [http://www.shop263.com/i-49/249.htm 造纸湿强剂] [http://www.shop263.com/i-49/250.htm 造纸用糊料] [http://www.shop263.com/i-49/251.htm 造纸增强剂] [http://www.shop263.com/i-49/252.htm 造纸助剂] [http://www.shop263.com/i-49/253.htm 增白剂] [http://www.shop263.com/i-49/254.htm 增稠剂] [http://www.shop263.com/i-49/255.htm 增光剂] [http://www.shop263.com/i-49/256.htm 增强剂] [http://www.shop263.com/i-49/257.htm 增韧剂] [http://www.shop263.com/i-49/258.htm 增塑剂] [http://www.shop263.com/i-49/259.htm 增塑剂油性润滑材料] [http://www.shop263.com/i-49/260.htm 渣油阻垢剂] [http://www.shop263.com/i-49/261.htm 粘度甲基硅油] [http://www.shop263.com/i-49/262.htm 粘胶基活性炭纤维] [http://www.shop263.com/i-49/263.htm 粘胶基活性炭纤维毡] [http://www.shop263.com/i-49/264.htm 粘胶树脂] [http://www.shop263.com/i-49/265.htm 樟脑磺酸] [http://www.shop263.com/i-49/266.htm 针剂炭] [http://www.shop263.com/i-49/267.htm 针剂用活性炭] [http://www.shop263.com/i-49/268.htm 珍珠砂] [http://www.shop263.com/i-49/269.htm 正硅酸乙酯] [http://www.shop263.com/i-49/270.htm 正钛酸四丁酯] [http://www.shop263.com/i-49/271.htm 支承筛板] [http://www.shop263.com/i-49/272.htm 织物整理剂] [http://www.shop263.com/i-49/273.htm 脂肪胺] [http://www.shop263.com/i-49/274.htm 脂肪酸丁酯] [http://www.shop263.com/i-49/275.htm 脂肪酸酯] [http://www.shop263.com/i-49/276.htm 植物沥青] [http://www.shop263.com/i-49/277.htm 植物生长调节剂] [http://www.shop263.com/i-49/278.htm 纸力增强剂] [http://www.shop263.com/i-49/279.htm 纸品乳液] [http://www.shop263.com/i-49/280.htm 指示剂] [http://www.shop263.com/i-49/281.htm 制动液] [http://www.shop263.com/i-49/282.htm 制冷剂] [http://www.shop263.com/i-49/283.htm 中低分子量聚异丁烯] [http://www.shop263.com/i-49/284.htm 中高档润滑油] [http://www.shop263.com/i-49/285.htm 中铬黄] [http://www.shop263.com/i-49/286.htm 中和缓蚀剂] [http://www.shop263.com/i-49/287.htm 中间体] [http://www.shop263.com/i-49/288.htm 中脱剂] [http://www.shop263.com/i-49/289.htm 中性酯蜡] [http://www.shop263.com/i-49/290.htm 终止剂] [http://www.shop263.com/i-49/291.htm 仲辛醇] [http://www.shop263.com/i-49/292.htm 重氮] [http://www.shop263.com/i-49/293.htm 重铬酸钾] [http://www.shop263.com/i-49/294.htm 重晶石矿粉] [http://www.shop263.com/i-49/295.htm 重蜡] [http://www.shop263.com/i-49/296.htm 重质碳酸钙] [http://www.shop263.com/i-49/297.htm 重质正构烷烃] [http://www.shop263.com/i-49/298.htm 珠光剂] [http://www.shop263.com/i-49/299.htm 竹醋液] [http://www.shop263.com/i-49/300.htm 助催化剂] [http://www.shop263.com/i-49/301.htm 助焊剂] [http://www.shop263.com/i-49/302.htm 助剂] [http://www.shop263.com/i-49/303.htm 助留助滤剂] [http://www.shop263.com/i-49/304.htm 助滤剂] [http://www.shop263.com/i-49/305.htm 助燃剂] [http://www.shop263.com/i-49/306.htm 铸造用糠醇树脂] [http://www.shop263.com/i-49/307.htm 专用金属切削液] [http://www.shop263.com/i-49/308.htm 状碳] [http://www.shop263.com/i-49/309.htm 子聚酰胺树脂] [http://www.shop263.com/i-49/310.htm 紫外线吸收剂] [http://www.shop263.com/i-49/311.htm 阻垢分散剂] [http://www.shop263.com/i-49/312.htm 阻垢缓蚀剂] [http://www.shop263.com/i-49/313.htm 阻垢剂] [http://www.shop263.com/i-49/314.htm 阻聚剂] [http://www.shop263.com/i-49/315.htm 阻燃剂] [http://www.shop263.com/i-49/316.htm 阻油剂] [http://www.shop263.com/i-49/317.htm 钻井泥浆] [http://www.shop263.com/i-49/318.htm 钻井泥浆助剂] [http://www.shop263.com/i-49/319.htm 铬明矾] [http://www.shop263.com/i-49/320.htm 铬酸酐] [http://www.shop263.com/i-49/321.htm 庚酮] [http://www.shop263.com/i-49/322.htm 工程胶粘剂] [http://www.shop263.com/i-49/323.htm 工业地板] [http://www.shop263.com/i-49/324.htm 工业硅] [http://www.shop263.com/i-49/325.htm 工业及火车用碳刷] [http://www.shop263.com/i-49/326.htm 氯化钾] [http://www.shop263.com/i-49/327.htm 氯化聚乙烯] [http://www.shop263.com/i-49/328.htm 氯化聚乙烯无尘复合稳定润滑剂] [http://www.shop263.com/i-49/329.htm 氯化石蜡] [http://www.shop263.com/i-49/330.htm 氯化石蜡油] [http://www.shop263.com/i-49/331.htm 氯化锶] [http://www.shop263.com/i-49/332.htm 氯化锌法] [http://www.shop263.com/i-49/333.htm 氯化亚砜] [http://www.shop263.com/i-49/334.htm 氯化亚铁] [http://www.shop263.com/i-49/335.htm 氯磺化聚乙烯] [http://www.shop263.com/i-49/336.htm 烃油乳液型消泡剂] [http://www.shop263.com/i-49/337.htm 通用化学试剂] [http://www.shop263.com/i-49/338.htm 天然真石漆]

Topic BinaryMethodsMultiMethodExample . { Edit | Attach | Ref-By | Printable | Diffs | r1.7 | > | r1.6 | > | r1.5 | More }
Revision r1.3 - 28 Oct 2004 - 05:41 GMT - LiYan
Parents: WebHome > CodeExamples
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