1. // 简单工厂
    2. public class Operation {
    4.     private Double number1;
    5.     private Double number2;
    7.     public Double getNumber1() {
    8.         return number1;
    9.     }
    10.     public void setNumber1(Double number1) {
    11.         this.number1 = number1;
    12.     }
    13.     public Double getNumber2() {
    14.         return number2;
    15.     }
    16.     public void setNumber2(Double number2) {
    17.         this.number2 = number2;
    18.     }
    20.     public Double getResult() {
    21.         double result=0;
    22.         return result;
    23.     }
    24. }
    26. // 加法工厂
    27. public class OperationAdd extends Operation {
    29.     @Override
    30.     public Double getResult() {
    31.         Double result=0d;
    32.         result=getNumber1()+getNumber2();
    33.         return result;
    35.     }
    36. }
    37. // 除法工厂
    38. public class OperationDiv extends Operation {
    40.     @Override
    41.     public Double getResult() {
    42.         Double result=0d;
    43.         result=getNumber1()/getNumber2();
    44.         return result;
    46.     }
    47. }
    48. // 乘法工厂
    49. public class OperationMul extends Operation {
    51.     @Override
    52.     public Double getResult() {
    53.         Double result=0d;
    54.         result=getNumber1()*getNumber2();
    55.         return result;
    57.     }
    58. }
    59. // 减法工厂
    60. public class OperationSub extends Operation {
    62.     @Override
    63.     public Double getResult() {
    64.         Double result=0d;
    65.         result=getNumber1()-getNumber2();
    66.         return result;
    68.     }
    69. }
    70. // 测试
    71. public class Test {
    73.     public static void main(String[] args) {
    75.         System.out.println("加法工厂测试");
    76.         OperationAdd operationAdd=new OperationAdd();
    77.         operationAdd.setNumber1(Double.valueOf(1));
    78.         operationAdd.setNumber2(Double.valueOf(1));
    79.         Double addResult = operationAdd.getResult();
    80.         System.out.println(addResult);
    82.         System.out.println("减法工厂测试");
    83.         OperationSub operationSub=new OperationSub();
    84.         operationSub.setNumber1(Double.valueOf(2));
    85.         operationSub.setNumber2(Double.valueOf(1));
    86.         Double subResult = operationSub.getResult();
    87.         System.out.println(subResult);
    89.         System.out.println("乘法工厂测试");
    90.         OperationMul operationMul=new OperationMul();
    91.         operationMul.setNumber1(Double.valueOf(2));
    92.         operationMul.setNumber2(Double.valueOf(1));
    93.         Double mulResult = operationMul.getResult();
    94.         System.out.println(mulResult);
    97.         System.out.println("减法工厂测试");
    98.         OperationDiv operationDiv=new OperationDiv();
    99.         operationDiv.setNumber1(Double.valueOf(2));
    100.         operationDiv.setNumber2(Double.valueOf(1));
    101.         Double divResult = operationMul.getResult();
    102.         System.out.println(divResult);
    103.     }
    104. }